@article { ISI:000228413800008, title = {Pyrazole-tethered heteroditopic ligands and their transition metal complexes: synthesis, structure, and reactivity}, journal = {European Journal of Inorganic Chemistry}, number = {7}, year = {2005}, month = {APR}, pages = {1254-1263}, publisher = {WILEY-V C H VERLAG GMBH}, type = {Article}, address = {BOSCHSTRASSE 12, D-69469 WEINHEIM, GERMANY}, abstract = {

Various pyrazole-based PN (2a-c) and N,N (3a-b) ligands have been synthesized. Using representative ligands, Ni-II, Co-II, Cu-II, and Cu-I complexes have been prepared and structurally characterized by crystallography. During complexation of Co-II and Cu-II salts, the phosphane part of the PN ligand oxidized to phosphane oxide. For N,N donor ligands, a dimeric chloro-bridged Ni-III complex was obtained. Ni-II complex 4 is an active catalyst for ethylene oligomerization. ((c) Wiley-VCH Verlag GmbH \& Co. KGaA, 69451 Weinheirn, Germany, 2005).

}, keywords = {cobalt, Copper, hemilabile ligands, Nickel, oligomerization, Pyrazole}, issn = {1434-1948}, doi = {10.1002/ejic.200400818}, author = {Mukherjee, Anuradha and Subramanyam, U. and Puranik, Vedavati G. and Mohandas, T. P. and Sarkar, A.} } @article { ISI:000272052200068, title = {Enhanced nonvolatile resistive switching in dilutely cobalt doped TiO2}, journal = {Applied Physics Letters}, volume = {95}, number = {20}, year = {2009}, month = {NOV}, pages = {203502}, publisher = {AMER INST PHYSICS}, address = {CIRCULATION \& FULFILLMENT DIV, 2 HUNTINGTON QUADRANGLE, STE 1 N O 1, MELVILLE, NY 11747-4501 USA}, abstract = {

Incorporation of dilute concentration of dopant having a valence state different than that of the host cation enables controlled incorporation proximity vacancy defects for local charge balance. Since nonvolatile resistive switching is a phenomenon tied to such defects, it can be expected to be influenced by dilute doping. In this work, we demonstrate that enhanced nonvolatile resistive switching is realized in dilutely cobalt doped TiO2 films grown at room temperature. We provide essential characterizations and analyses. We suggest that the oxygen vacancies in the proximity of immobile dopants provide well distributed anchors for the development of systematic filamentary tracks.

}, keywords = {cobalt, Doping, magnetic switching, random-access storage, titanium compounds, vacancies (crystal), valency}, issn = {0003-6951}, doi = {10.1063/1.3263713}, author = {Bogle, Kashinath A. and Bachhav, Mukesh N. and Deo, Meenal S. and Valanoor, Nagarajan and Ogale, Satishchandra B.} } @article { ISI:000300274300002, title = {Transport of metal ions through cellulose fiber supported solid membrane into tributyl phosphate containing mixed solvents}, journal = {Chemical and Biochemical Engineering Quarterly}, volume = {25}, number = {4}, year = {2011}, month = {DEC}, pages = {425-431}, publisher = {CROATIAN SOC CHEMICAL ENGINEERING TECHNOLOGY}, address = {BERISLAVICEVA 6, PO BOX 123, HR-10000 ZAGREB, CROATIA}, abstract = {

A novel cation exchange fiber supported solid membrane was developed for transport of cobalt, manganese and nickel metal ions. Fiber supported solid membrane was prepared by chemically modifying the cellulose fibers with citric acid. In the fiber supported solid membrane, the diffusion by capillary action by keeping the liquid phase in the porous solid fiber and ion exchange mechanism were used for the effective transport of metal ions. The experimental variables examined were concentration of metal ions (10(-2) to 10(-4) mol L-1) in the source solution, mixed solvent composition (phi = 20 \% TBP, acetone or tetrahydrofuran or 1,4-dioxane or methanol or ethanol or 2-propanol 10 to 60 \% and HCl (1 to 2 mol L-1) in the receiving phase and stirring speed (40-120 rpm) of the bulk source and receiving phase. The enrichment of concentration of cobalt, manganese and nickel metal ions was observed from the dilute solutions.

}, keywords = {binary of mixtures of metal ions, cobalt, extraction, fiber supported solid membrane, ion exchange, manganese and nickel metal ions, stripping}, issn = {0352-9568}, author = {Gaikwad, Abaji G.} } @article { ISI:000298731200036, title = {Fluorinated metal-organic frameworks: advantageous for higher H-2 and CO2 adsorption or not?}, journal = {Chemistry-A European Journal}, volume = {18}, number = {2}, year = {2012}, month = {JAN}, pages = {688-694}, publisher = {WILEY-V C H VERLAG GMBH}, address = {BOSCHSTRASSE 12, D-69469 WEINHEIM, GERMANY}, abstract = {

The synthesis, structure, and gas adsorption properties of three new metalorganic frameworks (MOFs) designed from isonicotinic acid (INA) and its fluorinated analogue 3-fluoroisonicotinic acid (FINA) along with CoII as the metal center have been reported. Co-INA-1 ([Co3(INA)4(O)(C2H5OH)3][NO3].C2H5OH.3?H2O; INA=isonicotinic acid) and Co-INA-2 ([Co(INA)2].DMF) are structural isomers as are Co-FINA-1 ([Co3(FINA)4(O)(C2H5OH)2].H2O; FINA=3-fluoroisonicotinic acid) and Co-FINA-2 ([Co(FINA)2].H2O), but the most important thing to note here is that Co-INA-1 and Co-FINA-1 are isostructural as are Co-INA-2 and Co-FINA-2. The effect of partial introduction of fluorine atoms into the framework on the gas uptake properties of MOFs having similar structures has been analyzed experimentally and computationally in isostructural MOFs.

}, keywords = {cobalt, fluorine, Hydrogen storage, metal-organic frameworks, microporous materials, X-ray diffraction}, issn = {0947-6539}, doi = {10.1002/chem.201102295}, author = {Pachfule, Pradip and Chen, Yifei and Jiang, Jianwen and Banerjee, Rahul} } @article { ISI:000311698800036, title = {One-pot sol-gel preparation for efficient cobalt-molybdenum-titania hydrotreating catalysts}, journal = {Chemcatchem}, volume = {4}, number = {12}, year = {2012}, month = {DEC}, pages = {2112-2120}, publisher = {WILEY-V C H VERLAG GMBH}, address = {BOSCHSTRASSE 12, D-69469 WEINHEIM, GERMANY}, abstract = {

Titania-based hydrodesulfurization catalysts were prepared by using a one-pot solgel method with the titanium peroxo complex as titanium precursor and molybdenum and cobalt precursors dissolved in the aqueous hydrogen peroxide solution used during synthesis. Catalysts with MoO3 loadings varying from 5 to 40 wt?\% and a Co/Mo atomic ratio of 0.5 were prepared. Solids with molybdenum loadings below 20 wt?\% MoO3 demonstrated poor hydrodesulfurization activity for the model compound thiophene. This was attributed to the presence of a large amount of embedded cobalt and molybdenum species in the titania matrix. A significant increase in the catalytic activity was observed for solids containing 20 and 25 wt?\% of MoO3 on which active species appeared to be accessible on the titania surface. Furthermore, the highest conversion obtained on these solgel solids was superior to the highest conversion obtained on reference catalysts prepared through the impregnation of ammonium heptamolybdate and cobalt nitrate on commercial titania.

}, keywords = {cobalt, heterogeneous catalysis, Molybdenum, sol-gel process, titanium}, issn = {1867-3880}, doi = {10.1002/cctc.201200165}, author = {Nguyen, D. L. and Gillot, S. and Souza, D. O. and Blanchard, P. and Lamonier, Carole and Berrier, E. and Kotbagi, T. V. and Dongare, Mohan K. and Shubhangi B. Umbarkar and Cristol, S. and Payen, E. and Lancelot, Christine} } @article { ISI:000326900600015, title = {Mixed Co-Mn oxide-catalysed selective aerobic oxidation of vanillyl alcohol to vanillin in base-free conditions}, journal = {Chempluschem}, volume = {78}, number = {11}, year = {2013}, month = {NOV}, pages = {1384-1392}, publisher = {WILEY-V C H VERLAG GMBH}, address = {BOSCHSTRASSE 12, D-69469 WEINHEIM, GERMANY}, abstract = {

Manganese-doped cobalt mixed oxide (MnCo-MO) catalyst was prepared by a solvothermal method. The as-prepared catalyst was characterised by X-ray photoelectron spectroscopy, H-2 temperature-programmed reduction, O-2 temperature-programmed oxidation and XRD. This catalyst gave 62\% conversion with 83\% selectivity to vanillin in 2hours for the liquid-phase air oxidation of vanillyl alcohol without using base. Three different types of metal oxides were observed in the prepared catalyst, which could be identified as Co3O4, Mn3O4 and CoMn2O4. Among these, the tetragonal phase of CoMn2O4 was found to be more active and selective for vanillyl alcohol oxidation than Co3O4 and Mn3O4. High-resolution TEM characterisation revealed the morphology of MnCo-MO nanorods with a particle size of 10nm. Successful recycling of the catalyst was also established in this oxidation reaction.

}, keywords = {aerobic oxidation, cobalt, heterogeneous catalysis, manganese, spinel phases}, issn = {2192-6506}, doi = {10.1002/cplu.201300247}, author = {Jha, Ajay and Patil, Kashinath R. and Rode, Chandrashekhar V.} } @article { ISI:000336248900015, title = {Total synthesis of the putative structure of xylarinol B}, journal = {Chemistry-An Asian Journal}, volume = {9}, number = {6}, year = {2014}, month = {JUN}, pages = {1557-1562}, publisher = {WILEY-V C H VERLAG GMBH}, address = {BOSCHSTRASSE 12, D-69469 WEINHEIM, GERMANY}, abstract = {

The total synthesis of the putative structure of xylarinolB is described and the need to revise its structure is demonstrated. The central benzoxepine skeleton was constructed by employing a cobalt-mediated bimolecular [2+2+2] Reppe-Vollhardt alkyne cycloaddition reaction.

}, keywords = {Chiral pool, cobalt, Natural products, structure elucidation, Total synthesis}, issn = {1861-4728}, doi = {10.1002/asia.201301647}, author = {More, Atul A. and Ramana, Chepuri V.} } @article { ISI:000350754400004, title = {Target cum flexibility: synthesis of indolo[1,2-b]isoquinoline derivatives via cobalt-catalyzed [2+2+2] cyclotrimerization}, journal = {Synlett}, volume = {26}, number = {5}, year = {2015}, month = {MAR}, pages = {604-608}, publisher = {GEORG THIEME VERLAG KG}, address = {RUDIGERSTR 14, D-70469 STUTTGART, GERMANY}, abstract = {

A modular approach for the synthesis of small molecules having the unnatural 6,11-dihydroindolo[1,2-b]isoquinoline tetracyclic core has been documented. An acid-catalyzed Friedel-Crafts-type C2-alkylation of N-propargyl indole with a suitably activated alkynol has been used to prepare the key indole-derived diynes. The cobalt-catalyzed [2+2+2] cyclotrimerization of these diynes has been studied with various internal/terminal alkynes and with nitriles.

}, keywords = {2-b]-isoquinoline, cobalt, Indole, indolo[1, Pyridine, [2+2+2] cyclotrimerization}, issn = {0936-5214}, doi = {10.1055/s-0034-1379950}, author = {Swami, Anuradha and Ramana, Chepuri V.} } @article {46430, title = {Glycine-induced electrodeposition of nanostructured cobalt hydroxide: a bifunctional catalyst for overall water splitting}, journal = {ChemSusChem}, year = {2019}, month = {NOV}, type = {Article; Early Access}, abstract = {

Herein, an interconnected alpha-Co(OH)(2) structure with a network-like architecture was used as a bifunctional electrocatalyst for the overall water splitting reaction in alkaline medium. The complexing ability of glycine with a transition metal was exploited to form [Co(gly)(3)](-) dispersion at pH 10, which was used for the electrodeposition. High-resolution TEM, UV/Vis-diffuse reflectance spectroscopy, and X-ray photoelectron spectroscopy were used to confirm that the as-synthesized materials had an alpha-Co(OH)(2) phase. The electrocatalytic oxygen and hydrogen evolution activity of the glycine-coordinated alpha-Co(OH)(2) was found to be approximately 320 and 145 mV, respectively, at 10 mA cm(-2). The material required approximately 1.60 V (vs. reversible hydrogen electrode; RHE) to achieve the benchmark of 10 mA cm(-2) for overall water splitting with a mass activity of approximately 63.7 A g(-1) at 1.60 V (vs. RHE). The chronoamperometric response was measured to evidence the stability of the material for overall water splitting for up to 24 h. Characterization of the catalyst after the oxygen and hydrogen evolution reactions was performed by XPS and showed the presence of a Co-II/Co-III oxidation state.

}, keywords = {cobalt, Electrochemistry, heterogeneous catalysis, Hydrogen, water splitting}, issn = {1864-5631}, doi = {10.1002/cssc.201902323}, author = {Shilpa, Nagaraju and Nadeema, Ayasha and Kurungot, Sreekumar} } @article {46177, title = {High-performing PGM-free AEMFC cathodes from carbon-supported cobalt ferrite nanoparticles}, journal = {Catalysts}, volume = {9}, year = {2019}, month = {MAR}, pages = {264}, type = {Article}, abstract = {

Efficient and durable non-precious metal electrocatalysts for the oxygen reduction reaction (ORR) are highly desirable for several electrochemical devices, including anion exchange membrane fuel cells (AEMFCs). Here, cobalt ferrite (CF) nanoparticles supported on Vulcan XC-72 carbon (CF-VC) were created through a facile, scalable solvothermal method. The nano-sized CF particles were spherical with a narrow particle size distribution. The CF-VC catalyst showed good ORR activity, possessing a half-wave potential of 0.71 V. Although the intrinsic activity of the CF-VC catalyst was not as high as some other platinum group metal (PGM)-free catalysts in the literature, where this catalyst really shined was in operating AEMFCs. When used as the cathode in a single cell 5 cm(-2) AEMFC, the CF-VC containing electrode was able to achieve a peak power density of 1350 mW cm(-2) (iR-corrected: 1660 mW cm(-2)) and a mass transport limited current density of more than 4 A cm(-2) operating on H-2/O-2. Operating on H-2/Air (CO2-free), the same cathode was able to achieve a peak power density of 670 mW cm(-2) (iR-corrected: 730 mW cm(-2)) and a mass transport limited current density of more than 2 A cm(-2). These peak power and achievable current densities are among the highest reported values in the literature to date.

}, keywords = {AEMFC, cobalt, Ferrite, high-performing, non-PGM, vulcan}, issn = {2073-4344}, doi = {10.3390/catal9030264}, author = {Peng, Xiong and Kashyap, Varchaswal and Ng, Benjamin and Kurungot, Sreekumar and Wang, Lianqin and Varcoe, John R. and Mustain, William E.} } @article {45593, title = {Nickel and cobalt affect galactosylation of recombinant IgG expressed in CHO cells.}, journal = {BioMetals}, volume = {32}, year = {2019}, month = {OCT}, pages = {11-19}, type = {Article}, abstract = {

Glycosylation is an important product quality attribute of antibody biopharmaceuticals. It involves enzymatic addition of oligosaccharides on proteins by sequential action of glycosyltransferases and glycosidases in the endoplasmic reticulum and golgi. Some of these enzymes like galactosyltransferase and N-acetylglucosaminyltransferase-I require trace metal cofactors. Variations in trace metal availability during production can thus affect glycosylation of recombinant glycoproteins such as monoclonal antibodies. Variability in trace metal concentrations can be introduced at multiple stages during production such as due to impurities in raw materials for culture medium and leachables from bioreactors. Knowledge of the effect of various trace metals on glycosylation can help in root-cause analysis of unintended variability in glycosylation. In this study, we investigated the effect of nickel and cobalt on glycosylation of recombinant IgG expressed in Chinese hamster ovary cells. Nickel concentrations below 500 {\textmu}M did not affect glycosylation, but above 500 {\textmu}M it significantly decreases galactosylation of IgG. Cobalt at 50 {\textmu}M concentration causes slight increase in G1F glycans (mono galactosylated) as previously reported. However, higher concentrations result in a small increase in G0F (non galactosylated) glycans. This effect of nickel and cobalt on galactosylation of recombinant IgG can be reversed by supplementation of uridine and galactose which are precursors to UDP-Galactose, a substrate for the enzymatic galactosylation reaction.

}, keywords = {cobalt, Galactosylation, glycosylation, Nickel, Process variability, Trace metals}, issn = {0966-0844}, doi = {10.1007/s10534-018-0152-0}, author = {Prabhu, A. and Gadgil, M.} } @article {47598, title = {Co-decorated tellurium nanotubes for energy storage applications}, journal = {ACS Applied Nano Materials}, volume = {4}, year = {2021}, month = {SEP}, pages = {9008-9021}, type = {Article}, abstract = {This paper explicitly discusses the synthesis of Co-decorated Te nanotubes (NTs) using Te NTs as the sacrificial template and the evaluation of their electrochemical performance. First, one-dimensional (1D) Te NTs were synthesized and characterized by spectroscopic and microscopic tools such as UV-visible spectroscopy, X-ray diffraction spectroscopy, X-ray photoelectron spectroscopy, field-emission scanning electron microscopy, high-resolution transmission electron microscopy, and energy-dispersive X-ray spectroscopy analyses. The as-prepared hexagonal Te NTs (h-Te NTs) possess diameters of about 35 +/- 5 nm and lengths of about 500 +/- 50 nm and were used for the synthesis of Co-decorated Te NTs. The 1D nanostructure with excellent conductivity enables the material to show excellent electrochemical performance. The asymmetric assembly of the CoTe-2//AC electrode material displayed a high specific capacitance of 147 F g(-1) (specific capacity, 162 C g(-1) at a current density of 2 A g(-1) in 4 M KOH electrolyte. In addition to that, the assembly of CoTe-2//AC achieved an excellent energy density of 51.1 W h kg(-1) at a power density of 2294 W kg(-1) and confirmed the as-synthesized Co-decorated Te NTs to be an excellent electrode material.}, keywords = {cobalt, nanotubes, pseudocapacitors, surfactant, Tellurium, template}, doi = {10.1021/acsanm.1c01613}, author = {Bhol, Prangya and Swain, Swarnalata and Jena, Satyaranjan and Bhatte, Kushal and Rout, Chandra Sekhar and Saxena, Manav and Jadhav, Arvind H. and Samal, Akshaya K.} } @article {48217, title = {Synthesis and crystal structures of Mn(II) and Co(II) complexes as catalysts for oxidation of cyclohexanone}, journal = {Inorganics}, volume = {10}, year = {2022}, month = {JUL}, pages = {100}, type = {Article}, abstract = {

The global demand on adipic usage in the production of plasticizers and synthetic polyamide is increasing. In line with the search for an efficient and energy-conserving way to isolate adipic acid (AA) in good yields, this paper introduces the oxidization of cyclohexanone utilizing two new coordination compounds, [Mn(2,6-pydc)(2)](imi) (1) and [Co(H(2)pza)(2)(H2O)(2)(NO3)].NO3 (2), as catalysts. Compounds 1 and 2 were synthesized by room temperature and refluxing methods, and characterized by spectral analyses (IR and UV-Vis.), SEM, BET, TGA, elemental, and X-ray crystallography. The single crystal structure of compound 1 revealed that pyridinedicarboxylate (2,6-pydc) and imidazole (imi) moieties were coordinated to the Mn(II) atom through imine nitrogen and deprotonated oxygen atoms, to form an undistorted octahedral coordination geometry with the N2O4 donor set. The axial and equatorial planes containing O2, O4, O5, and O7 atoms were from two adjacent 2,6-pydc ligands which formed the unidendate donor ligand; imi, on the other hand, acted as a bidendate donor ligand. For compound 2, the Co(II) atom was being coordinated by two pyrazinamide (H(2)pza) moieties, which acted as an unidendate donor ligand; two water molecules occupying the axial position, and one nitrate molecule occupying the apical position, were within the coordination sphere; a nitrate molecule was disordered outside the coordination sphere. The distance, 4.658 angstrom, between the Co1 atom and the N8 atom of the uncoordinated nitrate molecule, was within the range reported elsewhere. Cyclohexanone peroxidation experiments revealed that compound 1 exhibited unique catalytic performance by giving a 72.8\% yield in adipic acid, in comparison to the 71.3\% yield obtained with compound 2. The yields in AA were maintained by way of recyclability evaluation. The reaction kinetics of compound 2 gave less activation energy, E-a 2938 J mol(-1), while the thermodynamic parameters indicated that the chemical reactivity of cyclohexanone on the active surfaces of compounds 1 and 2 was via monolayer physisorption.

}, keywords = {cobalt, Complexes, cyclohexanone, Imidazole, managanese, Oxidation, pyrazinamide, pyridinedicarboxylate}, doi = {10.3390/inorganics10070100}, author = {Tella, Adedibu C. and Isaac, Aaron Y. and Clayton, Hadley S. and Ogunlaja, Adeniyi S. and Venugopalan, Aswathy T. and Prabu, Marimuthu and Thirumalaiswamy, Raja} }