• Sujit K Ghosh

      Articles written in Journal of Chemical Sciences

    • Self-assembly of a Co(II) dimer through H-bonding of water molecules to a 3D open-framework structure

      Sujit K Ghosh Parimal K Bharadwaj

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      Reaction of pyridine-2,4,6-tricarboxylic acid (ptcH3) with Co(NO3)2.6H2O in presence of 4,4′-bipyridine (4,4′-bpy) in water at room temperature results in the formation of [Co2(ptcH)2(4,4′-bpy) (H2O)4]·2H2O, (1). The solid-state structure reveals that the compound is a dimeric Co(II) complex assembled to a 3D architecture via an intricate intra- and inter-molecular hydrogen-bonding interactions involving water molecules and carboxylate oxygens of the ligand ptcH2-. Crystal data: monoclinic, spacegroup P21/c, a = 11·441(5) å,b = 20·212(2) å,c = 7·020(5) å, Β = 103·77(5)°,V= 1576-7(1) å3,Z = 2,R1 = 00363,wR2 = 0·0856,S = 1·000.

    • Guest driven structural transformation studies of a luminescent metal-organic framework

      Biplab Manna Shweta Singh Sujit K Ghosh

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      A two-dimensional (2D) porous metal-organic framework (MOF) [{Zn2(L)4(OTf)4}.2(DCM).xG]$_n$ (1 $\supset$ G) (OTf = trifluoro methane sulfonate, DCM = Dichloromethane, L (1, 4-bis (4-pyridyl)-2, 3-diaza-1, 3-butadiene) synthesized at room temperature. Free guests DCM were encapsulated in the pores of the MOF. On air drying the MOF loses free DCM molecules and changed its structure in a crystal to crystal manner to produce compound 1 [{Zn(L)2(OTf)2}.XG]$_n$(1). This guest-induced breathing of the framework was also supported from PXRD patterns. Solid state photoluminescence properties of the dynamicMOF were studied at room temperature.

    • Reversible structural transformations in a Co(II)-based 2D dynamic metal-organic framework showing selective solvent uptake

      Sanjog S Nagarkar Sujit K Ghosh

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      A Co(II)-based two-dimensional (2D) metal-organic framework (MOF) [Co(pca)(bdc)0.5(H2O)2] (1) {pca = pyrazine carboxylic acid, and bdc = 1,4-benzene dicarboxylic acid} was synthesized solvothermally. The compound loses the coordinated lattice water molecules on heating which is accompanied by solidstate structural transformation to yield dehydrated phase [Co(pca)(bdc)0.5] (1′). The hydrated structure can be regained by exposing 1′ to water vapour (1′′). These reversible solid-state structural transformations are accompanied by a visible colour change in the material. The dehydrated compound also shows highly selective water uptake over other solvents like MeOH, EtOH, THF. This selective water uptake can be ascribed to the high affinity of polar water molecule towards the open metal site created on heating. The present report provides important insights into the reversible structural transformations observed due to variable coordination number of the central metal ion and transformability of the framework. The selective water uptake over alcohols along with visible colour change demonstrates the potential of the present compound in bio-alcohol purification.

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