SPECIATION OF TERNARY COMPLEXES OF LEAD(II), CADMIUM(II) AND MERCURY(II) WITH L-DOPA AND PHENANTHROLINE IN DIOXAN-WATER MIXTURES

被引：0

作者：

Padmaja, N. ^{[1
]}

Rao, G. N. ^{[2
]}

机构：

[1] Anil Neerukonda Inst Technol & Sci, Dept Chem, Visakhapatnam 531162, Andhra Pradesh, India

[2] Andhra Univ, Sch Chem, Visakhapatnam 530003, Andhra Pradesh, India

来源：

OXIDATION COMMUNICATIONS | 2013年 / 36卷 / 04期

关键词：

complex equilibria; mixed ligand complexes; speciation/toxic metals; L-Dopa; 1,10-phenanthroline; dioxan; L-GLUTAMIC ACID; LIGAND COPPER(II) COMPLEXES; ALPHA-AMINO-ACIDS; TOXIC METAL-IONS; L-METHIONINE; UREA; SOLVENT;

D O I：

暂无

中图分类号：

O6 [化学];

学科分类号：

0703 ;

摘要：

A computer-assisted pH metric investigation has been made on the speciation of Pb(II), Cd(II) and Hg(II) complexes of L-dopa and 1, 10-phenanthroline in solutions containing different ratios of metal to primary(Dopa) and secondary(Phen) ligands, (M:L:X = 1:2.5:2.5; 1:2.5:5.0; 1:5.0:2.5). The titrations are carried out with sodium hydroxide in varying concentrations (0-60% v/v) of dioxan water mixtures at an ionic strength of 0.16 mol dm(-3) and 303 K. Pb(II), Cd(II) and Hg(II) form the ternary complexes of MLXH, MLX2H and ML2XH2 in dioxan-water mixtures. The variation of stability constants with dielectric constant is explained on the basis of electrostatic and non-electrostatic forces.

引用

页码：1032 / 1045

页数：14

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