@article { ISI:000231058000003, title = {Zeolite-based organic-inorganic hybrid catalysts for phosgene-free and solvent-free synthesis of cyclic carbonates and carbamates at mild conditions utilizing CO2}, journal = {Applied Catalysis A - General}, volume = {289}, number = {2}, year = {2005}, month = {AUG}, pages = {128-134}, publisher = {ELSEVIER SCIENCE BV}, address = {PO BOX 211, 1000 AE AMSTERDAM, NETHERLANDS}, abstract = {

As-synthesized zeolite-beta exhibits high catalytic activity for the synthesis of cyclic carbonates and alkyl and aryl carbarnates by a phosgene-free route, utilizing the greenhouse effect gas CO2. The reaction occurs with high yields of the desired products at mild conditions and without using any solvent or cocatalyst. Cyclic carbonates are synthesized by cycloaddition reaction Of CO2 with oxiranes (epichlorohydrin, propene oxide, styrene oxide and n-butene oxide) at 393 K and 6.9 bar. Alkyl and aryl carbarnates are synthesized by the reaction of the corresponding amines, CO2 and n-butyl bromide at 353 K and 3.4 bar. The as-synthesized zeolite-beta containing the encapsulated quaternary ammonium ions is not only reusable in several recycling experiments, but also shows superior activity to that of the corresponding homogeneous, quaternary ammonium halide salt generally used in the commercial synthetic practice. The microporous silica (inorganic) acting in concert with the encapsulated organic component constitutes an efficient, recyclable catalyst for this reaction. (c) 2005 Elsevier B.V. All rights reserved.

}, keywords = {alkyl and aryl carbamates, carbon dioxide utilization, cyclic carbonate, phosgene-free synthetic route, Polycarbonate, zeolite-beta}, issn = {0926-860X}, doi = {10.1016/j.apcata.2005.04.055}, author = {Srivastava, R and Srinivas, D and Ratnasamy, P} } @article { ISI:000228435300001, title = {Zirconia-supported 12-tungstophosphoric acid as a solid catalyst for the synthesis of linear alkyl benzenes}, journal = {Journal of Catalysis}, volume = {231}, number = {1}, year = {2005}, month = {APR}, pages = {1-10}, publisher = {ACADEMIC PRESS INC ELSEVIER SCIENCE}, type = {Article}, address = {525 B ST, STE 1900, SAN DIEGO, CA 92101-4495 USA}, abstract = {

The liquid-phase alkylation of benzene with 1-octene and 1-dodecene was investigated with zirconia-supported 12-tungstophosphoric acid (TPA) as catalysts. We prepared the catalysts, with different TPA loading (5-20 wt\% calcined at 750 degrees C) and calcination temperatures (15 wt\% calcined from 650 to 850 degrees C), by suspending hydrous zirconia in a methanol solution of TPA, followed by drying and calcination. These catalysts were characterized by X-ray diffraction, DTG-DTA, FTIR pyridine adsorption, NH3-TPD, and P-31, MAS NMR spectroscopy measurements. The catalyst with optimum TPA loading (15\%) and calcination temperature (750 degrees C) was prepared in different solvents and characterized by P-31 MAS NMR spectroscopy. The XRD results indicate that TPA stabilizes the tetragonal phase of zirconia. The catalysts show both Bronsted and Lewis acidity, and 15\% TPA on zirconia calcined at 750 degrees C shows the highest acidity. P-31 MAS NMR spectra show two types of phosphorous species: one is the Keggin unit and the other is the decomposition product of TPA. The relative amount of each depends on TPA loading, calcination temperature, and the solvent used for the catalyst preparation. Under reaction conditions of 84 degrees C and a benzene/1-olefin molar ratio of 10 (time 1 h), the most active catalyst, 15\% TPA, calcined at 750 degrees C, gave more than 98\% olefin conversion with selectivity for 2-phenyl octane (53.5\%) and 2-phenyl dodecane (47\%). (c) 2004 Elsevier Inc. All rights reserved.

}, keywords = {12-tungstophosphoric acid, linear alkyl benzene, solvent effect, Zirconia}, issn = {0021-9517}, doi = {10.1016/j.jcat.2004.09.024}, author = {Devassy, Biju M. and Lefebvre, F. and Halligudi, Shivaraj B.} } @article { ISI:000227845200016, title = {Zirconia-supported phosphotungstic acid as catalyst for alkylation of phenol with benzyl alcohol}, journal = {Journal of Molecular Catalysis A - Chemical}, volume = {230}, number = {1-2}, year = {2005}, month = {APR}, pages = {113-119}, publisher = {ELSEVIER SCIENCE BV}, type = {Article}, address = {PO BOX 211, 1000 AE AMSTERDAM, NETHERLANDS}, abstract = {

The liquid-phase alkylation of phenol with benzyl alcohol was carried out using zirconia-supported phosphotungstic acid (PTA) as catalyst. The catalysts with different PTA loadings (5-20 wt.\% calcined at 750 degrees C) and calcination temperature (15 wt.\% calcined from 650 to 850 degrees C) were prepared and characterized by (31)p MAS NMR and FT-IR pyridine adsorption spectroscopy. The catalyst with optimum PTA loading (15\%) and calcination temperature (750 degrees C) was prepared in different solvents. 31p MAS NMR spectra of the catalysts showed two types of phosphorous species, one is the Keggin unit and the other is the decomposition product of PTA and the relative amount of each depends on PTA loading, calcination temperature and the solvent used for the catalyst preparation. The catalysts with 15\% PTA on zirconia calcined at 750 degrees C showed the highest Bronsted acidity. At 130 degrees C and phenol/benzyl alcohol molar ratio of 2 (time, I h), the most active catalyst, 15\% PTA calcined at 750 degrees C gave 98\% benzyl alcohol conversion with 83\% benzyl phenol selectivity. (c) 2004 Elsevier B.V. All rights reserved.

}, keywords = {Benzylation, phenol, Phosphotungstic acid, Zirconia}, issn = {1381-1169}, doi = {10.1016/j.molcata.2004.12.028}, author = {Devassy, Biju M. and Shanbhag, G. V. and Lefebvre, F. and Bohringer, Walter and Fletcher, Jack C. Q. and Halligudi, Shivaraj B.} } @article { ISI:000240496500030, title = {ZnO multipods, submicron wires, and spherical structures and their unique field emission behavior}, journal = {Journal of Physical Chemistry B}, volume = {110}, number = {37}, year = {2006}, month = {SEP}, pages = {18236-18242}, publisher = {AMER CHEMICAL SOC}, type = {Article}, address = {1155 16TH ST, NW, WASHINGTON, DC 20036 USA}, abstract = {

A simple method of vapor deposition for the shape selective synthesis of ZnO structures, namely, multipods, submicron wires, and spheres, has been successfully demonstrated. A plausible growth mechanism based on the studies of scanning electron microscopy (SEM), transmission electron microscopy (TEM), X-ray diffraction (XRD), and X-ray photoelectron spectroscopy (XPS) is proposed. Our studies suggest that the growth of a multipod structure is governed by the screw dislocation propagation while the vapor-liquid-solid (VLS) mechanism is responsible for the formation of submicron wires and spheres. Moreover, the flow rate of the carrier gas plays a crucial role in governing the morphology. Further, these structures exhibit an enhanced field emission behavior. The nonlinearity in the Fowler-Nordheim (F-N) plot, a characteristic feature of electron emission from semiconductors, is explained by considering the contributions from both the conduction and the valence bands of ZnO.

}, issn = {1520-6106}, doi = {10.1021/jp0628131}, author = {Ramgir, Niranjan S. and Late, Dattatray J. and Bhise, Ashok B. and More, Mahendra A. and Mulla, Imtiaz S. and Joag, Dilip S. and Vijayamohanan, K.} } @article { ISI:000245736400045, title = {Zirconia enrichment in zircon sand by selective fungus-mediated bioleaching of silica}, journal = {Langmuir}, volume = {23}, number = {9}, year = {2007}, month = {APR}, pages = {4993-4998}, publisher = {AMER CHEMICAL SOC}, type = {Article}, address = {1155 16TH ST, NW, WASHINGTON, DC 20036 USA}, abstract = {

One of the important routes for the production of zirconia is by chemical treatment and removal of silica from zircon sand (ZrSixOy). We present here a completely green chemistry approach toward enrichment of zirconia in zircon sand; this is based on the reaction of the fungus Fusarium oxysporum with zircon sand by a process of selective extracellular bioleaching of silica nanoparticles. Since this reaction does not result in zirconia being simultaneously leached out from the sand, there is a consequent enrichment of the zirconia component in zircon sand. We believe that fungal enzymes specifically hydrolyze the silicates present in the sand to form silicic acid, which on condensation by certain other fungal enzymes results in room-temperature synthesis of silica nanoparticles. This fungus-mediated twofold approach might have vast commercial implications in low-cost, ecofriendly, room-temperature syntheses of technologically important oxide nanomaterials from potentially cheap naturally available raw materials like zircon sand.

}, issn = {0743-7463}, doi = {10.1021/la062535x}, author = {Bansal, Vipul and Syed, Asad and Bhargava, Suresh Kumar and Ahmad, Absar and Sastry, Murali} } @article { ISI:000260941700137, title = {Zinc oxide nanoparticles as novel alpha-amylase inhibitors}, journal = {Journal of Applied Physics}, volume = {104}, number = {9}, year = {2008}, month = {NOV}, pages = {094907}, publisher = {AMER INST PHYSICS}, type = {Article}, address = {CIRCULATION \& FULFILLMENT DIV, 2 HUNTINGTON QUADRANGLE, STE 1 N O 1, MELVILLE, NY 11747-4501 USA}, abstract = {

Amylase inhibitors, also known as starch blockers, contain substances that prevent dietary starches from being absorbed by the body via inhibiting breakdown of complex sugars to simpler ones. In this sense, these materials are projected as having potential applications in diabetes control. In this context, we report on zinc oxide nanoparticles as possible alpha-amylase inhibitors. Zinc oxide nanoparticles have been synthesized using soft-chemistry approach and 1-thioglycerol was used as a surfactant to yield polycrystalline nanoparticles of size similar to 18 nm, stabilized in wurtzite structure. Conjugation study and structural characterization have been done using x-ray diffraction technique, Fourier transform infrared spectroscopy, UV-visible spectroscopy, and transmission electron microscopy. Cytotoxicity studies on human fibrosarcoma (HT-1080) and skin carcinoma (A-431) cell lines as well as mouse primary fibroblast cells demonstrate that up to a dose of 20 mu g/ml, ZnO nanoparticles are nontoxic to the cells. We report for the first time the alpha-amylase inhibitory activity of ZnO nanoparticles wherein an optimum dose of 20 mu g/ml was sufficient to exhibit 49\% glucose inhibition at neutral pH and 35 degrees C temperature. This inhibitory activity was similar to that obtained with acarbose (a standard alpha-amylase inhibitor), thereby projecting ZnO nanoparticles as novel alpha-amylase inhibitors. (C) 2008 American Institute of Physics. [DOI: 10.1063/1.3009317]

}, issn = {0021-8979}, doi = {10.1063/1.3009317}, author = {Dhobale, Sandip and Thite, Trupti and Laware, S. L. and Rode, C. V. and Koppikar, Soumya J. and Ghanekar, Ruchika-Kaul and Kale, Sangeeta N.} } @article { ISI:000276917900011, title = {ZnO-beta zeolite: as an effective and eco-friendly heterogeneous catalyst for the synthesis of benzothiazole derivatives}, journal = {Chinese Chemical Letters}, volume = {21}, number = {4}, year = {2010}, month = {APR}, pages = {421-425}, publisher = {ELSEVIER SCIENCE INC}, address = {360 PARK AVE SOUTH, NEW YORK, NY 10010-1710 USA}, abstract = {

A cheap and recyclable ZnO-beta zeolite was used as catalyst for the synthesis of benzothiazole derivatives. This method provides several advantages such as environmental friendliness, short reaction times, high yields, simple work-up procedure and catalyst was successfully reused for four cycles without significant loss of activity. (C) 2009 Machhindra K. Lande. Published by Elsevier B.V. on behalf of Chinese Chemical Society. All rights reserved.

}, keywords = {Benzothiazole, cyclocondensation, heterogeneous catalyst, ZnO-beta zeolite}, issn = {1001-8417}, doi = {10.1016/j.cclet.2009.10.020}, author = {Katkar, Santosh S. and Mohite, Pravinkumar H. and Gadekar, Lakshman S. and Vidhate, Kaluram N. and Lande, Machhindra K.} } @article { ISI:000293064700006, title = {ZnO-beta zeolite: as an effective and reusable heterogeneous catalyst for the one-pot synthesis of polyhydroquinolines}, journal = {Green Chemistry Letters and Reviews}, volume = {3}, number = {4}, year = {2010}, month = {DEC}, pages = {287-292}, publisher = {TAYLOR \& FRANCIS LTD}, address = {4 PARK SQUARE, MILTON PARK, ABINGDON OX14 4RN, OXON, ENGLAND}, abstract = {

ZnO-beta zeolite, an inexpensive and mild catalyst, has been used for the synthesis of polyhydroquinolines in excellent yields from the one-pot four-component condensation of aldehydes, dimedone, ethyl acetoacetate, and ammonium acetate in ethanol at room temperature. The remarkable advantages offered by this method are a green catalyst, mild reaction conditions, simple work-up procedures, much faster reactions, and excellent yield of products. Furthermore, the catalyst could be reused several times keeping its initial activity in recycled reactions.

}, keywords = {Hantzsch condensation, heterogeneous catalyst, multicomponent, ZnO-beta zeolite}, issn = {1751-8253}, doi = {10.1080/17518253.2010.482065}, author = {Katkar, Santosh S. and Mohite, Pravinkumar H. and Gadekar, Lakshman S. and Arbad, Balasaheb R. and Lande, Machhindra K.} } @article { ISI:000276548300011, title = {ZnO-beta zeolite mediated simple and efficient method for the one-pot synthesis of quinoxaline derivatives at room temperature}, journal = {Central European Journal of Chemistry}, volume = {8}, number = {2}, year = {2010}, month = {APR}, pages = {320-325}, publisher = {VERSITA}, address = {SOLIPSKA 14A-1, 02-482 WARSAW, POLAND}, abstract = {

A rapid and an efficient one-pot method for the synthesis of quinoxalines catalysed by ZnO-beta zeolite at room temperature is described. This environmentally benign method provides several advantages over methods that are currently employed such as a simple work-up, mild reaction conditions, good to excellent yields, and a process to recover and reuse the catalyst for several cycles with consistent activity.

}, keywords = {cyclocondensation, Quinoxaline, Room temperature, ZnO-beta zeolite}, issn = {1895-1066}, doi = {10.2478/s11532-009-0151-7}, author = {Katkar, Santosh S. and Mohite, Pravinkumar H. and Gadekar, Lakshman S. and Arbad, Balasaheb R. and Lande, Machhindra K.} } @article {42534, title = {Zn(II) and Cd(II)-based complexes for probing the enzymatic hydrolysis of Na4P2O7 by alkaline phosphatase in physiological conditions}, journal = {Chemical Communications}, volume = {47}, year = {2011}, month = {SEP}, pages = {8118-8120}, abstract = {

Newly synthesized Zn(II) and Cd(II)-based complexes show unique selectivity towards inorganic pyrophosphate (PPi) in 100\% aqueous medium at pH = 7.4 and act as a "turn-on" and "turn-off" real-time assay, respectively, for the evaluation of the enzymatic activity of alkaline phosphatase.

}, doi = {10.1039/C1CC12682B}, author = {Das, Priyadip and Sourish, Bhattacharya and Sandhya, Mishra and Das, Amitava} } @article {42528, title = {ZnII-2,2?:6?,2?-terpyridine-based complex as fluorescent chemosensor for PPi, AMP and ADP}, journal = {Europian Journal of Inorganic Chemistry}, year = {2011}, month = {JUL}, pages = {3050{\textendash}3058}, abstract = {

A new ZnII{\textendash}2,2':6',2"-terpyridine complex, derivatized with a coumarin moiety (L1Zn), acts as a fluorescent chemosensor for different biologically important phosphates like PPi, AMP and ADP in mixed aqueous media. Depending on the proportion of the aqueous fraction present in the solvent mixture, L1Zn shows a preference for different phosphate moieties at physiological pH. In an aqueous acetonitrile (2:3, v/v) medium this reagent shows a preference for AMP as compared to ADP, ATP and PPi. The binding affinities of L1Zn with different phosphate ions and associated shifts in the electronic spectra were rationalized by DFT calculations. Such an example of a receptor that is selective for AMP under physiological conditions is rare in the literature.

}, doi = {10.1002/ejic.201100125}, author = {Das, Priyadip and Ghosh, Amrita and Kesharwani, Manoj K. and Ramu, Vadde and Ganguly, Bishwajit and Das, Amitava} } @article {42525, title = {Zn(II)-cyclam based chromogenic sensors for recognition of atp in aqueous solution under physiological conditions and their application as viable staining agents for microorganism}, journal = {Inorganic Chemistry}, volume = {50}, year = {2011}, month = {MAR}, pages = {4162{\textendash}4170}, abstract = {

Two chromogenic complexes, L.Zn (where L is (E)-4-((4-(1,4,8,11-tetraazacyclotetradecan-1-ylsulfonyl)phenyl)diazenyl)-N,N-dimethylaniline) and its [2]pseudorotaxane form (α-CD.L.Zn), were found to bind preferentially to adenosine triphosphate (ATP), among all other common anions and biologically important phosphate (AMP, ADP, pyrophosphate, and phosphate) ions in aqueous HEPES buffer medium of pH 7.2. Studies with live cell cultures of prokaryotic microbes revealed that binding of these two reagents to intercellular ATP, produced in situ, could be used in delineating the Gram-positive and the Gram-negative bacteria. More importantly, these dyes were found to be nontoxic to living microbes (eukaryotes and prokaryotes) and could be used for studying the cell growth dynamics. Binding to these two viable staining agents to intercellular ATP was also confirmed by spectroscopic studies on cell growth in the presence of different respiratory inhibitors that influence the intercellular ATP generation.

}, doi = {10.1021/ic200223g}, author = {Mahato, Prasenjit and Ghosh, Amrita and Mishra, Sanjiv K. and Shrivastav, Anupama and Mishra, Sandhya and Das, Amitava} } @article { ISI:000315745600001, title = {Zoom-in - a targeted database search for identification of glycation modifications analyzed by untargeted tandem mass spectrometry}, journal = {European Journal of Mass Spectrometry}, volume = {18}, number = {6}, year = {2012}, month = {JAN}, pages = {475-481}, publisher = {IM PUBLICATIONS}, type = {Article}, address = {6 CHARLTON MILL, CHARLTON, CHICHESTER,, W SUSSEX PO18 0HY, ENGLAND}, abstract = {

Post-translational modifications (PTMs) are very important to biological function, however their identification and characterization is technically challenging. In this study, we have identified glycation modifications by nano LC-MSE, a data independent acquisition work flow, followed by database search using the Protein Lynx Global Server (PLGS). PLGS search with a complete human protein database hardly identified glycation modifications in a glycated human serum albumin (HSA), which was detected to be glycated by western blotting with advanced glycation end products (AGE) antibody and fluorescence spectroscopy. To overcome this difficulty, {\textquoteleft}{\textquoteleft}Zoom-In{\textquoteright}{\textquoteright} approach, a targeted database search was used to identify glycation modifications in a glycated HSA, which were further manually validated. This approach was useful for identification of glycation modifications from untargeted tandem mass spectrometry workflow such as MSE, but may require the development of a new algorithm or an upgrade of the existing software.

}, keywords = {advanced glycation end products (AGEs), data independent acquisition, Diabetes, post-translational modifications}, issn = {1469-0667}, doi = {10.1255/ejms.1203}, author = {Bhonsle, Hemangi S. and Korwar, Arvind M. and Kesavan, Suresh K. and Bhosale, Santosh D. and Bansode, Sneha B. and Kulkarni, Mahesh J.} } @article { ISI:000325849000034, title = {Zeolitic imidazolate framework (ZIF)-derived, hollow-core, nitrogen-doped carbon nanostructures for oxygen-reduction reactions in PEFCs}, journal = {Chemistry-A European Journal}, volume = {19}, number = {28}, year = {2013}, month = {JUL}, pages = {9335-9342}, publisher = {WILEY-V C H VERLAG GMBH}, address = {BOSCHSTRASSE 12, D-69469 WEINHEIM, GERMANY}, abstract = {

The facile synthesis of a porous carbon material that is doped with iron-coordinated nitrogen active sites (FeNC-70) is demonstrated by following an inexpensive synthetic pathway with a zeolitic imidazolate framework (ZIF-70) as a template. To emphasize the possibility of tuning the porosity and surface area of the resulting carbon materials based on the structure of the parent ZIF, two other ZIFs, that is, ZIF-68 and ZIF-69, are also synthesized. The resulting active carbon material that is derived from ZIF-70, that is, FeNC-70, exhibits the highest BET surface area of 262m2g-1 compared to the active carbon materials that are derived from ZIF-68 and ZIF-69. The HR-TEM images of FeNC-70 show that the carbon particles have a bimodal structure that is composed of a spherical macroscopic pore (about 200nm) and a mesoporous shell. X-ray photoelectron spectroscopy (XPS) reveals the presence of Fe-N-C moieties, which are the primary active sites for the oxygen-reduction reaction (ORR). Quantitative estimation by using EDAX analysis reveals a nitrogen content of 14.5wt.\%, along with trace amounts of iron (0.1wt.\%), in the active FeNC-70 catalyst. This active porous carbon material, which is enriched with Fe-N-C moieties, reduces the oxygen molecule with an onset potential at 0.80V versus NHE through a pathway that involves 3.3-3.8e- under acidic conditions, which is much closer to the favored 4e- pathway for the ORR. The onset potential of FeNC-70 is significantly higher than those of its counterparts (FeNC-68 and FeNC-69) and of other reported systems. The FeNC-based systems also exhibit much-higher tolerance towards MeOH oxidation and electrochemical stability during an accelerated durability test (ADT). Electrochemical analysis and structural characterizations predict that the active sites for the ORR are most likely to be the insitu generated NFeN2+2/C moieties, which are distributed along the carbon framework.

}, keywords = {Doping, Electrochemistry, metal-organic frameworks, Nanostructures, oxygen-reduction reaction}, issn = {0947-6539}, doi = {10.1002/chem.201300145}, author = {Palaniselvam, Thangavelu and Biswal, Bishnu P. and Banerjee, Rahul and Kurungot, Sreekumar} } @article { ISI:000323018700017, title = {Zirconium phenyl phosphonate phosphite as a highly active, reusable, solid acid catalyst for producing fatty acid polyol esters}, journal = {Applied Catalysis A-General}, volume = {462}, year = {2013}, month = {JUL}, pages = {129-136}, publisher = {ELSEVIER SCIENCE BV}, address = {PO BOX 211, 1000 AE AMSTERDAM, NETHERLANDS}, abstract = {

The application of zirconium phenyl phosphonate phosphite (ZrPP) as a solid acid catalyst for producing polyol esters by esterification of glycerol or trimethylolpropane with a fatty acid (C-8-C-18.1) is reported for the first time. ZrPP exhibits high catalytic activity and in particular, (di + tri) esters selectivity (92.3 mol\%). These esters of polyols are known for their application as biolubricants. The catalyst prepared using phosphorous acid to phenyl phosphonic acid molar ratio of 3:1 was found superior. The influence of process parameters on activity and selectivity of the catalyst was investigated. ZrPP was reusable in at least three recycling experiments. Hydrophobicity due to exposed phenyl groups on the surface is the possible cause for superior esterification activity of this novel, solid catalyst. (C) 2013 Elsevier B.V. All rights reserved.

}, keywords = {Biolubricants, Esterification of fatty acid, Fatty acid glycerides, Hydrophobic solid acid catalyst, Polyol esters, Zirconium phenyl phosphonate phosphite}, issn = {0926-860X}, doi = {10.1016/j.apcata.2013.04.043}, author = {Varhadi, Poonam and Kotwal, Mehejabeen and Srinivas, D.} } @article { ISI:000340347700042, title = {ZIF-8@PBI-Bul composite membranes: elegant effects of PBI structural variations on gas permeation performance}, journal = {Journal of Materials Chemistry A}, volume = {2}, number = {32}, year = {2014}, month = {AUG}, pages = {12962-12967}, publisher = {ROYAL SOC CHEMISTRY}, address = {THOMAS GRAHAM HOUSE, SCIENCE PARK, MILTON RD, CAMBRIDGE CB4 0WF, CAMBS, ENGLAND}, abstract = {

The composites of metal organic frameworks (MOFs) and polymers look promising as membrane materials for gas separation, provided benefits of both the components can be shown successfully. This work shows that the structural architecture of polybenzimidazole (PBI) is highly advantageous in offering attractive gas permeation properties of its composites with MOFs. PBI-Bul and its N-substituted (methyl and 4-tert-butylbenzyl) derivatives were blended with ZIF-8. In general, homogeneous blend formation of ZIF-8 was achieved with all three polymers, as supported by SEM. Wide angle X-ray diffraction, mechanical property analysis and density measurements of the composite membranes were performed in order to understand the effects of physical blending of MOFs and polymers. Gas permeability analysis of the composite membranes revealed that the properties of MOFs as well as those of polymers arising from their structural architecture are responsible for governing the permeability and selectivity of the resulting composites.

}, issn = {2050-7488}, doi = {10.1039/c4ta00611a}, author = {Bhaskar, Anand and Banerjee, Rahul and Kharul, Ulhas K.} } @article { ISI:000336844400010, title = {Zinc mediated allylations of chlorosilanes promoted by ultrasound: synthesis of novel constrained sila amino acids}, journal = {Organic \& Biomolecular Chemistry}, volume = {12}, number = {24}, year = {2014}, month = {MAY}, pages = {4093-4097}, publisher = {ROYAL SOC CHEMISTRY}, type = {Article}, address = {THOMAS GRAHAM HOUSE, SCIENCE PARK, MILTON RD, CAMBRIDGE CB4 0WF, CAMBS, ENGLAND}, abstract = {

A simple, fast and efficient method for allylation and propargylation of chlorosilanes through zinc mediation and ultrasound promotion is reported. As a direct application of the resulting bis-allylsilanes, three novel, constrained sila amino acids are prepared for the first time. The design and synthesis of the constrained sila analogue of GABA (gamma-amino butyric acid) is a highlight of this work.

}, issn = {1477-0520}, doi = {10.1039/c4ob00294f}, author = {Ramesh, Remya and Reddy, D. Srinivasa} } @article {46403, title = {ZnO(N)-Spiro-MeOTAD hybrid photodiode: an efficient self-powered fast-response UV (visible) photosensor}, journal = {Nanoscale}, volume = {6}, year = {2014}, month = {FEB}, pages = {503-513}, type = {Article}, abstract = {

Organic-inorganic hybrid photo-detectors with a self-sufficient mode of operation represent a research area of great current interest. In most efficient photodetectors and optoelectronic devices compound semiconductors containing toxic elements such as Cd, As, Te, S, Se etc. are used and these are also expensive. Hence there is also a rapidly growing interest in replacing these with environmentally friendly and earth-abundant materials. Herein, we report a facile solution-processed fabrication of a self-powered organic-inorganic hybrid photodetector using n-type oriented ZnO nanorods and p-type Spiro-MeOTAD semiconductor. ZnO is eco-friendly and earth-abundant, and Spiro-MeOTAD is nonhazardous. We show that the latter has far less toxicity than the toxic elements stated above. This visible blind UV photodetector shows high sensitivity (10(2)) and a UV/visible rejection ratio of 300. It also exhibits fast response times of tau(rise) similar to 200 mu s and tau(fall) similar to 950 mu s. Importantly, with a small modification of nitrogen incorporation in ZnO one can also realize a highly-sensitive self-powered visible light photodetector with at least 1000\% (or higher) improvements in quality factors (photocurrent/sensitivity/response time) as compared to previously reported organic-inorganic hybrid photo-detectors based on metal-chalcogenides (CdS-PANI or CuInSe2-P3HT). Interestingly, the broadband sensitivity of such N:ZnO-Spiro-MeOTAD photodiode enables sensing of low intensity (similar to 28 mu W cm(-2)) ambient white light with a high photocurrent density of 120 nA cm(-2) making it an efficient ambient white light detector.

}, issn = {2040-3364}, doi = {10.1039/c3nr04727j}, author = {Game, Onkar and Singh, Upendra and Kumari, Tanya and Banpurkar, Arun and Ogale, Satishchandra} } @article { ISI:000359166300077, title = {Zinc inhibits glycation induced structural, functional modifications in albumin and protects erythrocytes from glycated albumin toxicity}, journal = {International Journal of Biological Macromolecules}, volume = {79}, year = {2015}, month = {AUG}, pages = {601-610}, publisher = {ELSEVIER SCIENCE BV}, address = {PO BOX 211, 1000 AE AMSTERDAM, NETHERLANDS}, abstract = {

The present work aims to investigate the concentration and time dependant effect of zinc on the in vitro non enzymatic modifications of albumin by diabetic levels of glucose. Further, preventive and curative effect of zinc was studied by adding zinc before and after initiation of glycation respectively. Glycation of albumin was done at different concentrations of zinc (125, 250 and 500 mu M) at different time intervals (21,28 and 35 days) with appropriate controls. The antiglycation potential of zinc was assessed by estimating different markers of albumin glycation (fructosamines, carbonyls, bound sugar, AGEs), structural modifications (free amino, thiol group, beta amyloid, native PAGE, ANS binding, fluorescence lifetime decay and CD analysis) and functional properties (antioxidant activity, hemolysis). Zinc at highest concentration (500 mu M) significantly reduced modifications of albumin which was comparable to aminoguanidine and also protected secondary and tertiary structure of albumin after 28 days of incubation. Zinc exhibited significant protective effect on erythrocytes by inhibiting hemolysis. Thus the present study indicate preventive mode of albumin glycation inhibition by zinc. (C) 2015 Elsevier B.V. All rights reserved.

}, keywords = {Albumin, Erythrocytes, Glycation}, issn = {0141-8130}, doi = {10.1016/j.ijbiomac.2015.05.028}, author = {Tupe, Rashmi and Kulkarni, Amruta and Adeshara, Krishna and Sankhe, Neena and Shaikh, Shamim and Dalai, Sayli and Bhosale, Siddharth H. and Gaikwad, Sushama M.} } @article {44409, title = {Ziegler{\textendash}Natta polymerization and the remaining challenges}, journal = {Resonance}, year = {2017}, month = {NOV}, abstract = {Polymers have become indispensable in the 21st century, and today we cannot imagine life without them. However, till around the beginning of the last century, the science of polymers was considered a very primitive discipline, and majority of the scientific community did not believe that polymers even existed. Hermann Staudinger, among others, fought a long battle to convince the scientific community that polymers are real and that they are long chain molecular entities. Building on this rational bedrock of polymer science, Prof. Karl Ziegler laid the foundation of ethylene polymerization. As outlined by Dr. Sivaram in his articles on Ziegler and Natta, careful observations and systematic analyses of serendipitous results enabled Ziegler to deveop the enormously significant {\textquoteleft}Mulheim atmospheric polyethylene process{\textquoteright}. A decade later, {\textasciidieresis} Cossee and Arlman revealed the mechanism of this polymerization reaction, which is called {\textquoteleft}insertion polymerization{\textquoteright}. Insertion polymerization is popularly known as the {\textquoteleft}Ziegler{\textendash} Natta polymerization{\textquoteright}, in recognition of its founding fathers. Today, the world produces about 180 million tons of polyolefins annually, and polyethylene or polythene has become a household name.}, author = {Chikkali, Samir H.} } @article {44408, title = {ZnO{\textendash}ZnS heterojunctions: a potential candidate for optoelectronics applications and mineralization of endocrine disruptors in direct sunlight}, journal = {ACS Omega}, volume = {2}, year = {2017}, month = {OCT}, pages = {6768{\textendash}6781}, type = {Article}, abstract = {

Simple solution combustion synthesis was adopted to synthesize ZnO{\textendash}ZnS (ZSx) nanocomposites using zinc nitrate as an oxidant and a mixture of urea and thiourea as a fuel. A large thiourea/urea ratio leads to more ZnS in ZSx with heterojunctions between ZnS and ZnO and throughout the bulk; tunable ZnS crystallite size and textural properties are an added advantage. The amount of ZnS in ZSx can be varied by simply changing the thiourea content. Although ZnO and ZnS are wide band gap semiconductors, ZSx exhibits visible light absorption, at least up to 525 nm. This demonstrates an effective reduction of the optical band gap and substantial changes in its electronic structure. Raman spectroscopy, transmission electron microscopy, X-ray photoelectron spectroscopy, and secondary-ion mass spectrometry results show features due to ZnO and ZnS and confirm the composite nature with heterojunctions. The above mentioned observations demonstrate the multifunctional nature of ZSx. Bare ZSx exhibits a promising sunlight-driven photocatalytic activity for complete mineralization of endocrine disruptors such as 2,4-dichlorophenol and endosulphan. ZSx also exhibits photocurrent generation at no applied bias. Dye-sensitized solar cell performance evaluation with ZSx shows up to 4\% efficiency and 48\% incident photon conversion efficiency. Heterojunctions observed between ZnO and ZnS nanocrystallites in high-resolution transmission electron microscopy suggest the reason for effective separation of electron{\textendash}hole pairs and their utilization.

}, doi = {10.1021/acsomega.7b01172}, author = {Perumal Devaraji and Maitri Mapa and Hasna M. Abdul Hakkeem and Vediappan Sudhakar and Kothandam Krishnamoorthy and Chinnakonda S. Gopinath} } @article {44180, title = {ZIF-8@DBzPBI-BuI composite membranes for olefin/paraffin separation}, journal = {Journal of Membrane Science}, volume = {549}, year = {2018}, month = {MAR }, pages = {38-45}, type = {Article}, abstract = {ZIF-8 is a member of Zeolitic Imidazole Framework family having high internal surface area, the high thermo-chemical stability and ease of synthesis gained immense attention for its highly selective sieving ability. Transforming it into a membrane form and practical utility remains a challenge. Any success towards this direction would radically reduce the cost of propylene/propane separation. Present study reports use of substituted polybenzimidazole (DBzPBI-BuI) for fabrication of flexible, thus scalable composite membranes with ZIF-8 (ZIF8@DBzPBI-BuI) possessing host-guest compatibility. The membrane with 30\% ZIF-8 loading showed promising propylene-propane separation (ideal selectivity of 32.7), coupled with propylene permeability of 12.13 Barrer. Analysis of sorption shed light on the high contribution of diffusivity on governing permeation properties of the composite membranes. The mixed gas analysis offered highly encouraging results in comparison to known composite membranes of different polymers with ZIF-8. Placement of present data on {\textquoteleft}upper-bound{\textquoteright} showed a rapid enhancement in selectivity by the addition of ZIF-8 in the polymer matrix, which seems to be a result of the elimination of inter-phase defects. It was made possible due to the functionality of host polymer.}, keywords = {Gas permeation, Olefin/paraffin separation, Polybenzimidazole (PBI), ZIF-8}, issn = {0376-7388}, doi = {10.1016/j.memsci.2017.11.069}, author = {Kunjattu, Shebeeb H. and Ashok, Varsha and Bhaskar, Anand and Pandare, Kiran and Banerjee, Rahul and Kharul, Ulhas K.} } @article {44421, title = {Zinc supplementation decreases galactosylation of recombinant IgG in CHO cells}, journal = {Applied Microbiology and Biotechnology}, year = {2018}, month = {MAY}, pages = {1-11}, type = {Journal Article}, abstract = {

Trace element composition of culture medium can be altered to modulate glycoform of recombinant glycoproteins. In this study, we show that Zn2+ supplementation at or above 100 μM decreases galactosylation of recombinant IgG expressed in Chinese Hamster Ovary cells. This decrease in galactosylation is not due to reduced galactosyltransferase expression. This effect persists upon supplementation of galactose and uridine to the culture, indicating that it may not be due to reduced UDP-Gal availability. Measurements of galactosyltransferase activity in the cell lysate show that activity decreases with increasing Zn2+/Mn2+ ratio. This suggests that one possible explanation of the effect of Zn2+ may be reduced intracellular galactosyltransferase activity due to increase in Zn2+/Mn2+ ratio. Consistent with this, the decrease in galactosylation of IgG could be reversed by supplementation of Mn2+ (a cofactor of galactosyltransferase) which increases intracellular Mn2+ content. Measurement of total intracellular Zn2+ content, however, indicates no significant upregulation of total intracellular Zn2+ content and no significant downregulation of intracellular Mn2+ content with Zn2+ supplementation. One possible explanation could be that cellular detoxification response to higher extracellular Zn2+ concentration might lead to changes in intracellular distribution of Mn2+. In this case, Zn2+ supplementation would be expected to interfere with other known effects of Mn2+. Indeed, the previously reported increase in high mannose glycans upon Mn2+ supplementation in the absence of glucose is reversed by Zn2+ supplementation. This study also suggests the use of Mn2+ supplementation as a strategy to overcome the effect of lot-to-lot variability in trace element concentrations on galactosylation.

}, keywords = {CHO cells, glycosylation, manganese, Trace metals, zinc}, issn = {1757598}, doi = {10.1007/s00253-018-9064-8}, author = {Prabhu, Anuja}, editor = {Gadre, Ramchandra} } @article {44420, title = {Zirconium-substituted cobalt ferrite nanoparticle supported n-doped reduced graphene oxide as an efficient bifunctional electrocatalyst for rechargeable Zn-air battery}, journal = {ACS Catalysis}, volume = {8}, year = {2018}, month = {APR}, pages = {3715-3726}, type = { Article}, abstract = {

Solvothermal synthesis of zirconium-substituted cobalt ferrite nanoparticles was accomplished by the introduction of zirconium (Zr) in the spinel matrix to obtain a cost-effective and robust electrocatalyst that does not use noble metals. A variation in the cobalt ferrite structure CoFe2\−xZrxO4 with Zr (0.1\−0.4) substitution has significantly altered the overpotential for the electrocatalytic oxygen reduction reaction (ORR) and oxygen evolution reaction (OER), leading to an optimum composition of CFZr(0.3). The incorporation of the foreign Zr4+ ion in the cobalt ferrite spinel lattices has effectively enhanced the oxygen evolution reaction (OER) activity in comparison to the parent cobalt ferrite (CF) nanocrystals. However, a nominal change in the ORR current density has been observed due to Zr incorporation. For the OER, the Zr-substituted catalyst has shown a 40 mV negative shift in the overpotential in comparison with the CF nanoparticles at 10 mA/cm2 current density. Interestingly, the in situ grafting of Zr-substituted cobalt ferrite nanoparticles over N-doped reduced graphene oxide (CFZr(0.3)/N-rGO) results in remarkably enhanced performance during the ORR and moderately favored the OER with an overall potential difference (ΔE) of 0.840 V. The enhanced bifunctional electrocatalytic activity of the material is crucial for the fabrication of high-performance rechargeable Zn\−air batteries (ZABs). The prepared catalyst exhibited an overpotential of 80 mV for the ORR in comparison with the state-of-the-art (Pt/C) catalyst and an overpotential of 340 mV at 10 mA/cm2 current density for the OER from the standard value (1.23 V vs RHE). This potential bifunctional electrocatalyst has been employed as an electrode material for the fabrication of a primary ZAB, where it exhibited discharge capacities of 727 and 730 mAh/g at current densities of 20 and 30 mA/cm2 , respectively, under ambient conditions. The notable performance of the catalyst as a bifunctional material is observed during the cycling of the rechargeable ZAB. The prepared catalyst showed an increase of 200 mV in the overall operating overpotential after cycling for 10 cycles at 15 mA/cm2 in comparison to the 350 mV increase shown by the Pt/C catalyst.

}, keywords = {N-doped reduced graphene oxide, Oxygen Evolution Reaction, oxygen reduction reaction, zirconium-substituted cobalt ferrite}, issn = {2155-5435}, doi = {10.1021/acscatal.7b03823}, author = {Kashyap, Varchaswal and Kurungot, Sreekumar} } @article {45484, title = {Zebrafish acid ceramidase: expression in Pichia pastoris GS115and biochemical characterization}, journal = {International Journal of Biological Macromolecules}, volume = {122}, year = {2019}, month = {FEB}, pages = {587-593}, type = {Article}, abstract = {

Acid ceramidase (N-acylsphingosine deacylase EC 3.5.1.23; AC) catalyzes the hydrolysis of ceramide into sphingosine (SPH) and free fatty acid. Zebrafish acid ceramidase (AC) has 60\% homology with the human AC). Mutations in the human AC gene asah1 are known to cause Farber disease and spinal muscular atrophy with progressive myoclonic epilepsy. Zebrafish AC was overexpressed in Pichia pastoris by inserting asah1b gene into the genome. The majority of the overexpressed enzyme was secreted into the culture medium and purified to apparent homogeneity by stepwise chromatography. The recombinant protein was glycosylated precursor, that further undergoes limited autoproteolytic processing into two subunits (alpha and beta) which are visible in SDS-PAGE. The zebrafish AC is heterodimer associated with an inter-subunit disulfide bond. SDS-PAGE estimated the mass of native enzyme to be approximately 50 kDa \& size exclusion chromatography estimated the mass of the active enzyme as approximately 100 kDa, suggesting the formation of a dimer of heterodimers. The protein was secreted as a mixture of processed and unprocessed forms in the culture media. A preliminary characterization of purified zebrafish AC was done by an enzyme assay. The zebrafish AC expressed in Pichia pastoris would be used for further structural and functional analysis. (C) 2018 Elsevier B.V. All rights reserved.

}, keywords = {Autoproteolytic processing, Pichia pastoris, Zebrafish acid ceramidase}, issn = {0141-8130}, doi = {10.1016/j.ijbiomac.2018.10.222}, author = {Rajput, Vijay B. and Karthikeyan, Muthukumarasamy and Ramasamy, Sureshkumar} } @article {46233, title = {Zinc ion interactions in a two-dimensional covalent organic framework based aqueous zinc ion battery}, journal = {Chemical Science}, year = {2019}, month = {AUG}, type = {Article}, abstract = {

The two-dimensional structural features of covalent organic frameworks (COFs) can promote the electrochemical storage of cations like H+, Li+, and Na+\ through both faradaic and non-faradaic processes. However, the electrochemical storage of cations like Zn2+\ ion is still unexplored although it bears a promising divalent charge. Herein, for the first time, we have utilized hydroquinone linked β-ketoenamine COF acting as a Zn2+\ anchor in an aqueous rechargeable zinc ion battery. The charge-storage mechanism comprises of an efficient reversible interlayer interaction of Zn2+\ ions with the functional moieties in the adjacent layers of COF (-182.0 kcal mol-1). Notably, due to the well-defined nanopores and structural organization, a constructed full cell, displays a discharge capacity as high as 276 mA h g-1\ at a current rate of 125 mA g-1.

}, doi = {10.1039/C9SC03052B}, author = {Mohammed, Abdul Khayum and Ghosh, Meena and Vijayakumar, Vidyanand and Halder, Arjun and Nurhuda, Maryam and Kumar, Sushil and Addicoat, Matthew and Kurungot, Sreekumar and Banerjee, Rahul} } @article {47668, title = {ZCTs knockdown using antisense LNA GapmeR in specialized photomixotrophic cell suspensions of Catharanthus roseus: Rerouting the flux towards mono and dimeric indole alkaloids}, journal = {Physiology and Molecular Biology of Plants}, volume = {27}, year = {2021}, month = {JUL}, pages = {1437-1453}, type = {Article}, abstract = {The present study was carried out to silence the transcription factor genes ZCT1, ZCT2 and ZCT3 via lipofectamine based antisense LNA GapmeRs transfection into the protoplasts of established photomixotrophic cell suspensions. The photomixotrophic cell suspensions with a threshold of 0.5\% sucrose were raised and established using two-tiered CO2 providing flasks kept under high light intensity. The photomixotrophic cell suspensions showed morphologically different thick-walled cells under scanning electron microscopic analysis in comparison to the simple thin-walled parenchymatous control cell suspensions. The LC-MS analysis registered the vindoline production (0.0004 +/- 0.0001 mg/g dry wt.) in photomixotrophic cell suspensions which was found to be absent in control cell suspensions. The protoplasts were isolated from the photomixotrophic cell suspensions and subjected to antisense LNA GapmeRs silencing. Three lines, viz. Z1A, Z2C and Z3G were obtained where complete silencing of ZCT1, ZCT2 and ZCT3 genes, respectively, was observed. The Z3G line was found to show maximum production of vindoline (0.038 +/- 0.001 mg/g dry wt.), catharanthine (0.165 +/- 0.008 mg/g dry wt.) and vinblastine (0.0036 +/- 0.0003 mg/g dry wt.). This was supported by the multifold increment in the gene expression of TDC, SLS, STR, SGD, d4h, dat, CrT16H and Crprx. The present work indicates the master regulation of ZCT3 knockdown among all three ZCTs transcription factors in C. roseus to enhance the terpenoid indole alkaloids production. The successful silencing of transcription repressor genes has been achieved in C. roseus plant system by using photomixotrophic cell cultures through GapmeR based silencing. The present study is a step towards metabolic engineering of the TIAs pathway using protoplast transformation in C. roseus.}, keywords = {Catharanthine, LC-MS, Protoplast, TIAs, Vinblastine, Vindoline}, issn = {0971-5894}, doi = {10.1007/s12298-021-01017-y}, author = {Verma, Priyanka and Khan, Shamshad Ahmad and Parasharami, Varsha and Mathur, Ajay Kumar} } @article {47456, title = {Zinc-air batteries catalyzed using Co3O4 nanorod-supported N-doped entangled graphene for oxygen reduction reaction}, journal = {ACS Applied Energy Materials}, volume = {4}, year = {2021}, month = {MAY }, pages = {4570-4580}, type = {Article}, abstract = {

The work reported here deals with the development of an efficient non-platinum electrocatalyst for electrochemical oxygen reduction reaction (ORR) through a sequential pathway involving hydrothermal treatment followed by freeze-drying to build the desired structural architecture of the catalyst. The designed catalyst (Co3O4/nitrogen-doped entangled porous 3D graphene (NEGF)), which contains Co3O4 nanorods anchored on the surface of three-dimensional (3D)-structured N-doped graphene, was found to display higher ORR activity during single-electrode testing and demonstrate a Zn-air battery (ZAB) system. Under the hydrothermal treatment at 180 degrees C, in the presence of ammonia, nitrogen was doped into the carbon framework of graphene, which subsequently formed a self-assembled entangled 3D structure of graphene after freeze-drying. The hydrothermal treatment and freeze-drying processes were found to play vital roles in tuning the morphological and structural features of the catalyst. The doped nitrogen, apart from its favorable contribution toward ORR, helped facilitate efficient dispersion of oxide nanorods on graphene. Co3O4/NEGF displayed remarkable ORR activity in 0.1 M KOH solution, as evident from the 60 mV onset potential shift compared to the state-of-the-art Pt/C catalyst and the Tafel slope value of 74 mV dec(-1) vs 68 mV dec(-1) for Pt/C. The ZAB fabricated by employing Co3O4/NEGF as the cathode catalyst was found to be an efficient competitor for the system based on the Pt/C cathode. This high performance has been credited to the controlled interplay of the governing factors such as the interfacial interactions leading to the efficient dispersion of metal oxide nanorods, increased catalyst surface area, the cooperative effect arising from the defects present in the N-doped porous 3D graphene, and the synergetic interactions operating in the system.

}, keywords = {cobalt-oxide nanorod, freeze-drying, hydrothermal, N-doped entangled graphene, oxygen reduction reaction, zinc-air battery}, issn = {2574-0962}, doi = {10.1021/acsaem.1c00210}, author = {Manna, Narugopal and Singh, Santosh K. and Kharabe, Geeta Pandurang and Torris, Arun and Kurungot, Sreekumar} } @article {48690, title = {Zwitterionic disilanylium from an unsymmetrical disilene}, journal = {Chemical Communications}, volume = {59}, year = {2023}, month = {FEB }, pages = {1669-1672}, type = {Article}, abstract = {

The reaction of PhC(NtBu)2SiSi(SiMe3)(3) (1) with Me3SiCH(2)Cl afforded an unsymmetrical sp(2)-sp(3) disilene, 2, with concomitant elimination of Me3SiCl. The analogous reaction with PhC(NtBu)2SiCl resulted in the oxidative addition of the C-Cl bond at the Si(II) atom (3). The reactions of 2 with sulfur and selenium led to compounds with Si=E (E=S (4) and Se (5)) double bonds. Tellurium reacted differently with 2 and furnished a zwitterionic compound, 6.

}, issn = {1359-7345}, doi = {10.1039/d2cc06954g}, author = {Bisai, Milan Kumar and Ajithkumar, V. S. and Raj, K. Vipin and Vanka, Kumar and Gonnade, Rajesh G. and Sen, Sakya S.} } @article {49139, title = {Zwitterionic tetrastanna(II) cyclic crown}, journal = {European Journal of Inorganic Chemistry}, volume = {26}, year = {2023}, month = {OCT }, type = {Article}, abstract = {

A 12-membered zwitterionic tetrastanna(II) cycle 1 having a crown ether-like topology has been isolated from the deprotonation of 1,1 \& PRIME;-methylenediimidazole (B) with two equivalents of Sn[N(SiMe3)(2)](2) (A). The solid-state structure and NMR analysis confirms the tetrastanna(II) cycle 1 to be comprised of two stannate(II) and two stannyliumylidene ion pairs in alternating positions of the heterocycle. Computational analysis shows greater nucleophilicity at the proximally located stannate(II) centers. Nonetheless, the tetrastanna(II) cycle 1 remains poorly reactive due to engagement of Sn-II lone pair electrons in intramolecular donor-acceptor interactions. Simple deprotonation reaction between Sn[N(SiMe3)(2)](2) (A) and N-(diisopropylphenyl)imidazole (C) in equimolar ratio has led to a stannylene 2, involving the formation of a Sn-C covalent bond with the anionic imidazol-2-yl carbon center along with the release of NH(SiMe3)(2). Compound 2 exists as a dimer, where the unsubstituted ring nitrogen atom coordinated intermolecularly to the other stannylene center.

}, keywords = {Deprotonation, Imidazole, Macrocycle, Sn-II cation, stannylene}, issn = {1434-1948}, doi = {10.1002/ejic.202300249}, author = {Sahoo, Padmini and Chibde, Purva and Das, Satyabrata and Banerjee, Subhrashis and Mali, Bhupendra P. and Vanka, Kumar and Gonnade, Rajesh G. and Yildiz, Cem. B. and Majumdar, Moumita} } @article {49647, title = {ZrO2 supported Cu nanoparticles for sonogashira and ullmann coupling reactions under palladium-free conditions}, journal = {Catalysis Letters}, volume = {154}, year = {2024}, month = {JUN}, pages = {3078-3090}, type = {Article}, abstract = {

Cu nanoparticles supported on ZrO2 (CuNPs@ZrO2) were synthesized using a one-step co-precipitation process, and their application in C-C coupling reactions was investigated. The catalyst was characterized using XRD, XPS, SEM, TEM, and TGA techniques. The prepared catalyst was used for the Sonogashira cross-coupling reactions of aryl bromides with phenyl-acetylene in the presence of K2CO3 in DMF at 110 degrees C, which resulted in substituted alkynes with good to excellent yields. The protocol was also extended for the Ullmann coupling reactions of aryl iodides under similar reaction conditions, yielding the desired products with good to excellent yields without homo-coupling. Interestingly, unlike other copper catalysts, the present catalyst worked under air and did not require an inert atmosphere to prevent alkyne. This catalytic system is versatile, tolerant, and significantly cheaper than the {\textquoteleft}{\textquoteleft}traditional{\textquoteright}{\textquoteright} Pd-catalyzed Sonogashira cross-coupling of terminal alkynes with aryl halides. The catalyst could be reused for five catalytic cycles with no significant change in the product yield. All of these characteristics make our prepared CuNPs@ZrO2 catalyst quite suitable for the gram-scale synthesis of biaryls and alkynes, with a simple workup.{GRAPHIACAL ABSTRACT

}, keywords = {CuNPs, Recyclability, Sonogashira coupling, Ullmann coupling, ZrO2}, issn = {1011-372X}, doi = {10.1007/s10562-023-04513-w}, author = {Patil, Seema P. and Rajmane, Archana S. and Jadhav, Sanjay N. and Rajmane, Vijaya S. and Rode, Chandrashekhar V. and Kumbhar, Arjun S.} } @article {49963, title = {Zincke-derived viologen covalent organic framework as a high-performance cathode for aqueous zinc-iodine batteries}, journal = {Small}, volume = {21}, year = {2025}, month = {DEC }, type = {Article}, abstract = {

Aqueous zinc-iodine (Zn-I2) batteries are among the most promising energy storage technologies, offering high energy density, low cost, and intrinsic safety. However, their practical deployment is hindered by the polyiodide shuttle effect, leading to rapid capacity fading and poor cycling performance. This work demonstrates the application of a crystalline viologen-based covalent organic framework (TAB-DNP-BP COF), synthesized via a one-pot Zincke reaction, as an efficient iodine host material. The cationic backbone of the TAB-DNP-BP COF effectively confines iodine (I2) species and electrostatically traps polyiodides, suppressing their migration and protecting the zinc anode. Zinc-iodine batteries assembled with an I2-enriched TAB-DNP-BP COF (TAB-DNP-BP COF@I2) cathode deliver a high specific capacity of 337 mAh g-1 at 0.5 C, surpassing the performance of most reported COF-, MOF-, and cage-based systems, while exhibiting excellent cycling stability over 5000 cycles. This work highlights the potential of ionic COFs for stabilizing iodine chemistry and offers a promising strategy toward the development of high-performance, durable aqueous Zn-I2 batteries.

}, keywords = {iCOF, iodine confinement, viologen, zinc-iodine batteries, Zincke reaction}, issn = {1613-6810}, doi = {10.1002/smll.202506012}, author = {Das, Gobinda and Shivade, Rajkiran and Pandey, Priyanshi and Varghese, Sabu and Rajput, Nitul and Matouk, Zineb and Martinez, Jose Ignacio and Straubinger, Rainer and Benyettou, Farah and Gandara, Felipe and Olson, Mark A. and Aouad, Samer and Shelke, Manjusha V. and Trabolsi, Ali} } @article {49700, title = {Zn(ii)-metallo-photoantibiotics: experimental and computational approach identifying a therapeutic role for antibacterial and antibiofilm applications}, journal = {Chemical Communications}, volume = {61}, year = {2025}, month = {JUL}, type = {Article}, abstract = {

The antibacterial profiles of curcumin-based novel Zn(ii)-metallo-photoantibiotics against E. coli and B. subtilis are reported. In silico studies indicated their ROS generation capacity and binding interaction with bacterial proteins. Therapeutic results indicated the advantages of these Zn(ii)-metallo-photoantibiotics in antibacterial photodynamic therapy.

}, issn = {1359-7345}, doi = {10.1039/d5cc02340h}, author = {Kushwaha, Rajesh and Kumari, Sangeeta and Mishra, Arya and Upadhyay, Anjali and Rai, Archana and Nayak, Malay and Mukherjee, Sudip and Banerjee, Samya} }