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Mixed Metal Mixed Ligand Complexation Equilibria of Transition Metal Ions Involving Nitrilotriacetic Acid (NTA) and l-2-Amino-3-Methyl Butanoic Acid (Valine)

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Abstract

The stability constant and coordination modes of the multimetal–multiligand complexes of M2+ ions (M = M1 = M2 = Co(II), Ni(II), Cu(II), Zn(II) and Cd(II) with nitrilotriacetic acid (A) and l-2-amino-3 methyl butanoic acid (B) were studied potentiometrically by Calvin-Bjerrum’s method in the biologically relevant condition. The experimental data were obtained for the following model species, AH3, AH2, AH, BH2, BH, M(OH)+, M(OH)2, MA, MA(OH), MB, MAB and M1M2AB. The observed order of stability constant and percent distribution of different complex species with respect to pH was discussed. The calculation was made using the SCOGS computer program. The ternary species [AMB]2− and quaternary species [M1M2AB] were found to be in the range of pH 7–10 and 3–8 pH, respectively.

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Acknowledgments

The authors are thankful to the Head, Department of Chemistry, University of Allahabad, Allahabad for their continuous support and providing all necessary facilities for the research work.

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Authors and Affiliations

  1. Department of Chemistry, B.S.N.V. Post Graduate College, University of Lucknow, Lucknow, 226001, India

    Vijay Shankar

  2. Department of Chemistry, University of Allahabad, Allahabad, 211002, India

    Dharmveer Singh, Shalini Verma & Vijay Krishna

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  1. Vijay Shankar
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  2. Dharmveer Singh
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  3. Shalini Verma
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  4. Vijay Krishna
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Correspondence to Vijay Krishna.

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Shankar, V., Singh, D., Verma, S. et al. Mixed Metal Mixed Ligand Complexation Equilibria of Transition Metal Ions Involving Nitrilotriacetic Acid (NTA) and l-2-Amino-3-Methyl Butanoic Acid (Valine). Natl. Acad. Sci. Lett. 39, 185–189 (2016). https://doi.org/10.1007/s40009-016-0432-6

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  • DOI: https://doi.org/10.1007/s40009-016-0432-6

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