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Helical 2, 6-dipicolinate complex of Ni (II) incorporating sodium ions and its decomposition in 4-methyl pyridine

GeetikaGupta, Subrato Bhattacharya

Sodiumnickelate (II) bis(pyridine-2, 6- dicarboxylic acid)was synthesized by the reaction of NiCl2·6H2O, pyridine-2, 6-dicarboxylic acid (H2dipic) and Na2CO3 in equimolar ratio. Themolecule packs in a non-centrosymmetric manner in a head-to-tail motifwith sodiumions in bridging positions, thereby, extending the structure in the formof a 1Dpolymeric helical chain.The decomposition ofwhich in refluxing 4-methyl pyridine leads to a Ni(II) complex of 2,6- dipicolinic acid containing4-methyl pyridine as auxil-iary ligand. The complexes 1 and 2 have been characterized by FTIR,UV-Vis spectral, TGAand single crystalX-ray diffraction analyses. Themolar conductance of 1 in aqueous solution indicates that the complexes behave as (1:1) weak-electrolyte. Both the molecules crystallize in themonoclinic system(space group P21/c).