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4671376 
Journal Article 
SPECIATION OF TERNARY COMPLEXES OF LEAD(II), CADMIUM(II) AND MERCURY(II) WITH L-DOPA AND PHENANTHROLINE IN DIOXAN-WATER MIXTURES 
Padmaja, N; Rao, GN 
2013 
1 
Oxidation Communications
ISSN: 0209-4541 
36 
4 
1032-1045 
English 
WOS:000330146200022 
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. 
complex equilibria; mixed ligand complexes; speciation/toxic metals; L-Dopa; 1,10-phenanthroline; dioxan 
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