• V K Patel

      Articles written in Journal of Chemical Sciences

    • Effect of substitution on the catecholate ring on ternary complex stability

      P K Bhattacharya V K Patel

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      The formation constants of the complexes of the type [CuAL], where A=2,2′-bipyridyl, 1,10-phenanthroline, 2-(2′-pyridyl)benzimidazole, or 2-(2′-pyridyl)imidazoline and L=a dianion of catechol, tiron, protocatechuic acid, pyrogallol, 1,8-dihydroxynaphthalene, 2,3-dihydroxynaphthalene, dopamine, or adrenaline, have been determined in a dioxan-water (1∶1, v/v) medium and μ=0·2 mol dm−3 NaClO4 at 30°C, usingscogs method. The effect of the π acid character of A and substitution on ligand L on the ternary complex stability have been discussed.

    • Study of the probable reason why Ni(II) is excluded from metalloenzymes

      P K Bhattacharya P J Patel V K Patel

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      The formation constants of the complexes of the type [NiAL], where A=2,2′-bipyridyl, 1,10-phenanthroline, 2-(2′-pyridyl) benzimidazole, or 2-(2′-pyridyl) imidazoline and L=ethylenediamine, 1,2-diaminopropane, N-methyl-ethylenediamine, glycine, α-alanine, β-alanine, malonate, histidine, or histamine have been determined in dioxan-water (1∶1 v/v) medium and μ=0·2 mol dm−3 NaClO4 at 30°C. The values of ΔlogKM (logKMALMA−logKMLM) in Ni(II) complexes have been compared with corresponding Cu(II) complexes. It is observed that for [NiAL] complexes, where L=L1 to L7, ΔlogK is more negative than for the corresponding [CuAL] complexes whereas in cases where L=L8, or L9, ΔlogK for Ni(II) complexes is less negative than for the corresponding Cu(II) complexes. The reason has been discussed.

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