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

作者：Shankar Vijay; Singh Dharmveer; Verma Shalini; Krishna Vijay^*

来源：National Academy Science Letters-India, 2016, 39(3): 185-189.

DOI：10.1007/s40009-016-0432-6

• Multimetal-multiligand complexes
• Solution equilibria
• Transition metal ions

The stability constant and coordination modes of the multimetal-multiligand complexes of M2+ ions (M = M-1 = M-2 = 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, AH(3), AH(2), AH, BH2, BH, M(OH)(+), M(OH)(2), MA, MA(OH), MB, MAB and M(1)M(2)AB. 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 [M(1)M(2)AB] were found to be in the range of pH 7-10 and 3-8 pH, respectively.

• 出版日期2016-6