@article { ISI:000342990400003, title = {Mechanosynthesis of imine, beta-ketoenamine, and hydrogen-bonded imine-linked covalent organic frameworks using liquid-assisted grinding}, journal = {Chemical Communications}, volume = {50}, number = {84}, year = {2014}, month = {JUL}, pages = {12615-12618}, publisher = {ROYAL SOC CHEMISTRY}, address = {THOMAS GRAHAM HOUSE, SCIENCE PARK, MILTON RD, CAMBRIDGE CB4 0WF, CAMBS, ENGLAND}, abstract = {

A variety of aromatic amines/hydrazides and aldehydes have been utilized for the construction of crystalline COFs at a faster rate and in high yield, irrespective of their reactivity and solubility using the Liquid-Assisted Grinding (LAG) method.

}, issn = {1359-7345}, doi = {10.1039/c4cc03389b}, author = {Das, Gobinda and Shinde, Digambar Balaji and Kandambeth, Sharath and Biswal, Bishnu P. and Banerjee, Rahul} } @article { ISI:000343686500039, title = {Photocatalytic metal-organic framework from cds quantum dot incubated luminescent metallohydrogel}, journal = {Journal of the American Chemical Society}, volume = {136}, number = {42}, year = {2014}, month = {OCT}, pages = {14845-14851}, publisher = {AMER CHEMICAL SOC}, address = {1155 16TH ST, NW, WASHINGTON, DC 20036 USA}, abstract = {

Cadmium sulfide (CdS) quantum dots (\<10 nm in size) have been successfully synthesized in situ without any capping agent in a Zn(II)-based low-molecular-weight metallohydrogel (ZAVA). Pristine ZAVA hydrogel shows blue luminescence, but the emission can be tuned upon encapsulation of the CdS quantum dots. Time-dependent tunable emission (white to yellow to orange) of the CdS incubated gel (CdS@ZAVA gel) can be attributed to sluggish growth of the quantum dots inside the gel matrix. Once CdS quantum dots are entrapped, their augmentation can be stopped by converting the gel into xerogel, wherein the quantum dots remains embedded in the solid xerogel matrix. Similar size stabilization of CdS quantum dots can be achieved by means of a unique room-temperature conversion of the CdS incubated ZAVA gel to CdS incubated MOF (CdS@ZAVCl) crystals. This in turn arrests the tunability in emission owing to the restriction in the growth of CdS quantum dots inside xerogel and MOF. These CdS embedded MOFs have been utilized as a catalyst for water splitting under visible light.

}, issn = {0002-7863}, doi = {10.1021/0509019k}, author = {Saha, Subhadeep and Das, Gobinda and Thote, Jayshri and Banerjee, Rahul} } @article { ISI:000356176200034, title = {Chemical sensing in two dimensional porous covalent organic nanosheets}, journal = {Chemical Science}, volume = {6}, number = {7}, year = {2015}, month = {APR}, pages = {3931-3939}, publisher = {ROYAL SOC CHEMISTRY}, address = {THOMAS GRAHAM HOUSE, SCIENCE PARK, MILTON RD, CAMBRIDGE CB4 0WF, CAMBS, ENGLAND}, abstract = {

Two new imide-based crystalline, porous, and chemically stable covalent organic frameworks (COFs) (TpBDH and TfpBDH) have been successfully synthesized employing solvothermal crystallization route. Furthermore, thin layered covalent organic nanosheets (CONs) were derived from these bulk COFs by the simple liquid phase exfoliation method. These 2D CONs showcase increased luminescence intensity compared to their bulk counterparts (COFs). Notably, TfpBDH-CONs showcase good selectivity and prominent, direct visual detection towards different nitroaromatic analytes over TpBDH-CONs. Quite interestingly, TfpBDH-CONs exhibit a superior {\textquoteleft}{\textquoteleft}turn-on{\textquoteright}{\textquoteright} detection capability for 2,4,6-trinitrophenol (TNP) in the solid state, but conversely, they also show a {\textquoteleft}{\textquoteleft}turn-off{\textquoteright}{\textquoteright} detection in the dispersion state. These findings describe a new approach towards developing an efficient, promising fluorescence chemosensor material for both visual and spectroscopic detection of nitroaromatic compounds with very low [10(-5) (M)] analyte concentrations.

}, issn = {2041-6520}, doi = {10.1039/c5sc00512d}, author = {Das, Gobinda and Biswal, Bishnu P. and Kandambeth, Sharath and Venkatesh, V. and Kaur, Gagandeep and Addicoat, Matthew A. and Heine, Thomas and Verma, Sandeep and Banerjee, Rahul} } @article { ISI:000370900600019, title = {Photoluminescent tetrahedral d(10)-metal Schiff base complexes exhibiting highly ordered mesomorphism}, journal = {Polyhedron}, volume = {105}, year = {2016}, month = {FEB}, pages = {150-158}, publisher = {PERGAMON-ELSEVIER SCIENCE LTD}, address = {THE BOULEVARD, LANGFORD LANE, KIDLINGTON, OXFORD OX5 1GB, ENGLAND}, abstract = {

A series of four-coordinate d(10)-metal complexes of the type [ML2] {M = Zn, Cd, Hg; L = 4-nitro-2-((octadecylimino)methyl)phenol}, incorporating a new N-alkylated bidentate [N,O]-donor salicylaldimine Schiff base ligand, has been synthesized and characterized by elemental analyses, FT-IR, UV-Vis, H-1 NMR and FAB-mass spectroscopies. The ligand is non-mesomorphic and devoid of any photoluminescence. The zinc(II) and cadmium(II) complexes displayed highly ordered mesophases reminiscent of soft crystals. The phases have been characterized by polarizing optical microscopy (POM), differential scanning calorimetry (DSC) and powder X-ray diffraction (PXRD) studies. The complex of mercury(II) decomposed prior to melting. An orthogonal symmetry with a {\textquoteleft}herringbone{\textquoteright} array for the zinc complex and a primitive triclinic symmetry (p(1)) for the cadmium complex, respectively, has been proposed. The complexes exhibited fluorescence at room temperature, both in the solution and in the solid state, with emission maxima in the blue region. Density functional theory (DFT) calculations carried out using the GAUSSIAN 09 program at the B3LYP level revealed a distorted tetrahedral geometry around the metal center in all the complexes. Natural bond orbital (NBO) analysis suggested appreciable charge transfer from the ligand to the metal center in the complexes. (C) 2015 Elsevier Ltd. All rights reserved.

}, keywords = {Density functional theory, Luminescence, Mesophase, Schiff base, X-ray diffraction}, issn = {0277-5387}, doi = {10.1016/j.poly.2015.11.053}, author = {Chakraborty, Sutapa and Purkayastha, Debraj Dhar and Das, Gobinda and Bhattacharjee, Chira R. and Mondal, Paritosh and Prasad, S. Krishna and Rao, D. S. Shankar} } @article {49207, title = {Synergistic humidity-responsive mechanical motion and proton conductivity in a cationic covalent organic framework}, journal = {CHEM}, volume = {10}, year = {2024}, month = {AUG }, type = {Journal Article}, keywords = {ACTUATORS, Crystalline, DRIVEN, SOFT}, issn = {2451-9294}, doi = {10.1016/j.chempr.2024.04.018}, author = {Das, Gobinda and Shinde, Dhanraj B. and Melapurakkal, Amrutha and Shelke, V, Manjusha and Garai, Bikash and Bazin, Philippe and Blal, Abdelhafid Ait and Benyettou, Farah and Prakasam, Thirumurugan and Halim, Rasha Abdul and Ibrahim, Fayrouzabou and Sharma, Sudhir Kumar and Varghese, Sabu and Weston, James and Jagannathan, Ramesh and Addicoat, Matthew A. and Gandara, Felipe and Olson, Mark A. and El-Roz, Mohamad and Trabolsi, Ali} }