@article { ISI:000296312200066, title = {Helical water chain mediated proton conductivity in homochiral metal-organic frameworks with unprecedented zeolitic unh-topology}, journal = {Journal of the American Chemical Society}, volume = {133}, number = {44}, year = {2011}, month = {NOV}, pages = {17950-17958}, publisher = {AMER CHEMICAL SOC}, address = {1155 16TH ST, NW, WASHINGTON, DC 20036 USA}, abstract = {

Four new homochiral metal-organic framework (MOF) isomers, [Zn(l-L-Cl)(Cl)](H2O)(2) (1), [Zn(l-L-Br)(Br)]-(H2O)(2) (2), [Zn(d-L-Cl)(Cl)(H2O)(2) (3), and [Zn(d-L-Br)-(Br)] (H2O)(2) (4) [L = 3-methyl-2-(pyridin-4-ylmethylamino)-butanoic acid], have been synthesized by using a derivative of L-/D-valine and Zn(CH3COO)(2)center dot 2H(2)O. A three-periodic lattice with a parallel ID helical channel was formed along the crystallographic c-axis. Molecular rearrangement results in an unprecedented zeolitic unh-toparigy in 1-4. In each case, two lattice water molecules (one H-bonded. to halogen atoms) form a secondary helical continuous water chain inside the molecular helix. MOFs 1 and 2 shows different water adsorption properties and hence different water affinity. The arrangement of water molecules inside the channel Was monitored by variable temperature single crystal X-ray diffraction, which indicated that MOF 1 has a higher water holding capacity than MOF 2. In MOF 1, water escapes. at 80 degrees C, while in T the same happens at a much lower temperature (similar to 40 degrees C). All the MOFs reported here shows reversible crystallization by readily reabsorbing moisture. In MOFs 1 and 2, the frameworks are stable after solvent removal, which is confirmed by a single-crystal to single crystal transformation. MOFs 1 and 3 show high proton conductivity of 4.45 x 10(-5) and 4.42 x 10(-5) S cm(-1), respectively, while 2 and 4 shows zero proton conductivity. The above result is attributed to the fact that MOF 1 has a higher water holding capacity than MOF 2.

}, issn = {0002-7863}, doi = {10.1021/ja2078637}, author = {Sahoo, Subash Chandra and Kundu, Tanay and Banerjee, Rahul} } @article { ISI:000293693200004, title = {Hydrogen bond directed honeycomb-like porous network structure of tris (bipyridyl-glycoluril)cobalt(III) chloride}, journal = {Crystengcomm}, volume = {13}, number = {17}, year = {2011}, month = {JUL}, pages = {5289-5291}, publisher = {ROYAL SOC CHEMISTRY}, address = {THOMAS GRAHAM HOUSE, SCIENCE PARK, MILTON RD, CAMBRIDGE CB4 0WF, CAMBS, ENGLAND}, abstract = {

The [Co(bpg)3]Cl-3 complex (1), where bpg = 4b, 5, 7, 7a-tetrahydro4b,7a-epiminomethan-oimino-6H-imidazo [4,5-f][1,10]-phenanthroline-6,13-dione has been synthesized and characterized by various spectroscopic techniques and single crystal X-ray diffraction. The combination of bipyridyl-glycoluril (bpg) ligands and cobalt ion self-organise to form a honeycomb-like porous network structure resulting in the formation of zeolite like channels which adsorb gases, is described.

}, issn = {1466-8033}, doi = {10.1039/c1ce05376k}, author = {Kawade, Vitthal A. and Kumbhar, Avinash S. and Erxleben, Andrea and Pachfule, Pradip and Banerjee, Rahul} } @article { ISI:000328437200053, title = {Hydrolytic conversion of a metal-organic polyhedron into a metal-organic framework}, journal = {Angewandte Chemie-International Edition}, volume = {52}, number = {51}, year = {2013}, month = {DEC}, pages = {13755-13759}, publisher = {WILEY-V C H VERLAG GMBH}, address = {BOSCHSTRASSE 12, D-69469 WEINHEIM, GERMANY}, keywords = {cage compounds, crystal engineering, hydrophobic effect, metal-organic frameworks, Self-assembly}, issn = {1433-7851}, doi = {10.1002/anie.201307486}, author = {Mallick, Arijit and Garai, Bikash and Diaz, David Diaz and Banerjee, Rahul} } @article { ISI:000339802300026, title = {High charge carrier mobility in two dimensional indium (iii) isophthalic acid based frameworks}, journal = {Proceedings of the National Academy of Sciences India Section A-Physical Sciences}, volume = {84}, number = {2, SI}, year = {2014}, month = {JUN}, pages = {331-336}, publisher = {NATL ACAD SCIENCES INDIA}, address = {5 LAJPATRAI RD, ALLAHABAD 211002, INDIA}, abstract = {

The effect of dimensionality (1D to 2D) on charge carrier mobility have been studied thoroughly on three In(III)-isophthalate based MOFs [In-IA-1D, In-IA-2D-1 and -2]. In-IA-1D possess 1D nanotubular architecture with [(CH3)(2)NH2](+). In-IA-2D-1 have 2D layers containing only [(CH3)(2)NH2](+) cations. Whereas, In-IA-2D-2 have [(CH3)(2)NH2](+) cations as well as solvent DMF molecule inside the crystal structure. Due to presence of the pi-pi stacking arrangement among the phenyl rings of IA moieties facilitates the high charge carrier mobility (4.6 x 10(-3) cm(2) V-1 s(-1) at V-G = -40 V) in In-IA-2D-2. However, In-IA-1D and In-IA-2D-1 does not show any charge carrier mobility due to absence of pi-pi stacking arrangement.

}, keywords = {Charge carrier mobility, Coordination chemistry, metal organic framework, pi-pi stacking}, issn = {0369-8203}, doi = {10.1007/s40010-014-0152-6}, author = {Panda, Tamas and Banerjee, Rahul} } @article {PACHFULE, title = {Highly stable covalent organic framework-Au nanoparticles hybrids for enhanced activity for nitrophenol reduction}, journal = {Chemical Communications}, volume = {50}, number = {24}, year = {2014}, month = {JAN}, pages = {3169-3172}, publisher = {ROYAL SOC CHEMISTRY}, type = {Article}, address = {THOMAS GRAHAM HOUSE, SCIENCE PARK, MILTON RD, CAMBRIDGE CB4 0WF, CAMBS, ENGLAND}, abstract = {

{Gold [

}, issn = {1359-7345}, doi = {10.1039/c3cc49176e}, author = {Pachfule, Pradip and Kandambeth, Sharath and Diaz, David Diaz and Banerjee, Rahul} } @article { ISI:000357618200043, title = {Hollow tubular porous covalent organic framework (COF) nanostructures}, journal = {Chemical Communications}, volume = {51}, number = {58}, year = {2015}, month = {JUN}, pages = {11717-11720}, publisher = {ROYAL SOC CHEMISTRY}, address = {THOMAS GRAHAM HOUSE, SCIENCE PARK, MILTON RD, CAMBRIDGE CB4 0WF, CAMBS, ENGLAND}, abstract = {

Hollow and tubular TpPa-COF structures have been synthesized by template-assisted replication of nanometer sized ZnO-nanorods. The hollow structures composed of microporous TpPa shells have high periodicity, moderate porosity, chemical stability and capsule shaped morphology as revealed by X-ray diffraction, porosity measurements, and SEM and TEM analyses.

}, issn = {1359-7345}, doi = {10.1039/c5cc04130a}, author = {Pachfule, Pradip and Kandmabeth, Sharath and Mallick, Arijit and Banerjee, Rahul} } @article { ISI:000371753500044, title = {High loading of pd nanoparticles by interior functionalization of mofs for heterogeneous catalysis}, journal = {Inorganic Chemistry}, volume = {55}, number = {5}, year = {2016}, month = {MAR}, pages = {2345-2354}, publisher = {AMER CHEMICAL SOC}, address = {1155 16TH ST, NW, WASHINGTON, DC 20036 USA}, abstract = {

In this report, the issue related to nanoparticle (NP) agglomeration upon increasing their loading amount into metal-organic frameworks (MOFs) has been addressed by functionalization of MOFs with alkyne groups. The alkynophilicity of the Pd2+ (or other noble metals) ions has been utilized successfully for significant loading of Pd NPs into alkyne functionalized MOFs. It has been shown here that the size and loading amount of Pd NPs are highly dependent on the surface area and pore width of the MOFs. The loading amount of Pd NPs was increased monotonically without altering their size distribution on a particular MOF. Importantly, the distinct role of alkyne groups for Pe(2+) stabilization has also been demonstrated by performing a control experiment considering a MOF without an alkyne moiety. The preparation of NPs involved two distinct steps viz. adsorption of metal ions inside MOFs and reduction of metal ions. Both of these steps were monitored by microscopic techniques. This report also demonstrates the applicability of Pd@MOF NPs as extremely efficient heterogeneous catalysts for Heck-coupling and hydrogenation reactions of aryl bromides or iodides and alkenes, respectively.

}, issn = {0020-1669}, doi = {10.1021/acs.inorgchem.5b02739}, author = {Gole, Bappaditya and Sanyal, Udishnu and Banerjee, Rahul and Mukherjee, Partha Sarathi} } @article {47630, title = {Heterogeneous C-H functionalization in water via porous covalent organic framework nanofilms: a case of catalytic sphere transmutation}, journal = {Journal of the American Chemical Society}, volume = {143}, year = {2021}, month = {JUN }, pages = {8426-8436}, type = {Article}, abstract = {Heterogeneous catalysis in water has not been explored beyond certain advantages such as recyclability and recovery of the catalysts from the reaction medium. Moreover, poor yield, extremely low selectivity, and active catalytic site deactivation further underrate the heterogeneous catalysis in water. Considering these facts, we have designed and synthesized solution-dispersible porous covalent organic framework (COF) nanospheres. We have used their distinctive morphology and dispersibility to functionalize unactivated C-H bonds of alkanes heterogeneously with high catalytic yield (42-99\%) and enhanced regioand stereoselectivity (3 degrees:2 degrees = 105:1 for adamantane). Further, the fabrication of catalyst-immobilized COF nanofilms via covalent self-assembly of catalytic COF nanospheres for the first time has become the key toward converting the catalytically inactive homogeneous catalysts into active and effective heterogeneous catalysts operating in water. This unique covalent self-assembly occurs through the protrusion of the fibers at the interface of two nanospheres, transmuting the catalytic spheres into films without any leaching of catalyst molecules. The catalyst-immobilized porous COF nanofilms{\textquoteright} chemical functionality and hydrophobic environment stabilize the high-valent transient active oxoiron(V) intermediate in water and restricts the active catalytic site{\textquoteright}s deactivation. These COF nanofilms functionalize the unactivated C-H bonds in water with a high catalytic yield (45-99\%) and with a high degree of selectivity (cis:trans = 155:1; 3 degrees:2 degrees = 257:1, for cis-1,2-dimethylcyclohexane). To establish this approach{\textquoteright}s {\textquoteleft}{\textquoteleft}practical implementation{\textquoteright}{\textquoteright}, we conducted the catalysis inflow (TON = 424 +/- 5) using catalyst-immobilized COF nanofilms fabricated on a macroporous polymeric support.}, issn = {0002-7863}, doi = {10.1021/jacs.1c02425}, author = {Sasmal, Himadri Sekhar and Bag, Saikat and Chandra, Bittu and Majumder, Poulami and Kuiry, Himangshu and Karak, Suvendu and Sen Gupta, Sayam and Banerjee, Rahul} } @article {48815, title = {Hierarchical covalent organic framework-foam for multi-enzyme tandem catalysis}, journal = {Chemical Science}, volume = {14}, year = {2023}, month = {JUN }, pages = {6643-6653}, type = {Article}, abstract = {

Covalent organic frameworks (COFs) are ideal host matrices for biomolecule immobilization and biocatalysis due to their high porosity, various functionalities, and structural robustness. However, the porosity of COFs is limited to the micropore dimension, which restricts the immobilization of enzymes with large volumes and obstructs substrate flow during enzyme catalysis. A hierarchical 3D nanostructure possessing micro-, meso-, and macroporosity could be a beneficial host matrix for such enzyme catalysis. In this study, we employed an in situ CO2 gas effervescence technique to induce disordered macropores in the ordered 2D COF nanostructure, synthesizing hierarchical TpAzo COF-foam. The resulting TpAzo foam matrix facilitates the immobilization of multiple enzymes with higher immobilization efficiency (approximately 1.5 to 4-fold) than the COF. The immobilized cellulolytic enzymes, namely beta-glucosidase (BGL), cellobiohydrolase (CBH), and endoglucanase (EG), remain active inside the TpAzo foam. The immobilized BGL exhibited activity in organic solvents and stability at room temperature (25 degrees C). The enzyme-immobilized TpAzo foam exhibited significant activity towards the hydrolysis of p-nitrophenyl-beta-d-glucopyranoside (BGL@TpAzo-foam: K-m and V-max = 23.5 +/- 3.5 mM and 497.7 +/- 28.0 mu M min(-1)) and carboxymethylcellulose (CBH@TpAzo-foam: K-m and V-max = 18.3 +/- 4.0 mg mL(-1) and 85.2 +/- 9.6 mu M min(-1) and EG@TpAzo-foam: K-m and V-max = 13.2 +/- 2.0 mg mL(-1) and 102.2 +/- 7.1 mu M min(-1)). Subsequently, the multi-enzyme immobilized TpAzo foams were utilized to perform a one-pot tandem conversion from carboxymethylcellulose (CMC) to glucose with high recyclability (10 cycles). This work opens up the possibility of synthesizing enzymes immobilized in TpAzo foam for tandem catalysis.

}, issn = {2041-6520}, doi = {10.1039/d3sc01367g}, author = {Paul, Satyadip and Gupta, Mani and Dey, Kaushik and Mahato, Ashok Kumar and Bag, Saikat and Torris, Arun and Gowd, E. Bhoje and Sajid, Hasnain and Addicoat, Matthew A. and Datta, Supratim and Banerjee, Rahul} }