• Alok Ch Kalita

      Articles written in Journal of Chemical Sciences

    • An anionic two-dimensional indium carboxylate framework derived from a pseudo $C_3$-symmetric semi-flexible tricarboxylic acid

      Pratap Vishnoi Alok Ch Kalita Ramaswamy Murugavel

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      Hydrothermal treatment of indium(III) nitrate with a flexible pseudo $C_3$-symmetric tricarboxylic acid at 115°C for 5 days in DMF yields a new layered anionic indium carboxylate framework, [(CH3)2 NH2)][In(L)(HCOO)(DMF)]$_n$ (1) (L = 2,4,6-tris[(4′-carboxyphenoxy)methyl]-1,3,5-trimethylbenzene), existing as two-dimensional sheets. The framework solid has been characterized by elemental analysis, FT-IR spectroscopy, TGA, PXRD and single crystal X-ray diffraction studies. DMF undergoes cleavage to dimethyl ammonium and formate ions, which are incorporated in the framework. A slipped stacking of the two dimensional sheets along 𝑎-axis in 1 results in a drastic decrease in the anticipated large porosity of the framework.

    • Palladium complexes of a new type of N-heterocyclic carbene ligand derived from a tricyclic triazolooxazine framework

      Manoj Kumar Gangwar Alok Ch Kalita Prasenjit Ghosh

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      A new type of tricyclic triazolooxazine derived N-heterocyclic carbene precursors were developed by the alkylation reaction of a tricyclic triazolooxazine framework. In particular, the reaction of 5a,6,7,8,9,9ahexahydro-4𝐻-benzo[𝑏][1,2,3]triazolo[1,5-𝑑][1,4]oxazine with methyl iodide and ethyl iodide yielded the tricyclic triazolooxazine derived N-heterocyclic carbene precursors, (1−2)a, in 67−84% yield. The tricyclic triazolooxazinium iodide salts, (1−2)a, underwent metallation in a straight forward manner upon treatment with PdCl2 in the presence of K2CO3 in pyridine to give the trans-{3-(R)-5a,6,7,8,9,9a-hexahydro-4𝐻-benzo[𝑏][1,2,3]triazolo[1,5-𝑑][1,4]oxazin-4-ylidene} PdI2(pyridine) [R = Me (1b), Et (2b)] complexes in 23−25% yield. The new tricyclic triazolooxazine derived N-heterocyclic carbene moiety, as stabilized upon binding to palladium in the (1−2)b complexes, was structurally characterized by the X-ray single crystal diffraction studies.

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