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

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    • Keywords


      Mixed-ligand complexes with histidine; mixed-ligand complexes with histamine; complexes with heteroaromatic N-bases; mixed-ligand complexes of Ni(II)

    • Abstract


      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.

    • Author Affiliations


      P K Bhattacharya1 P J Patel1 V K Patel1

      1. Department of Chemistry, Faculty of Science, M.S. University of Baroda, Baroda - 390 002, India
    • Dates

  • Journal of Chemical Sciences | News

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