The complexation reactions between 4-(2-pyridy1azo)-resorcinol and Cd ,H g and Pb io ns have been investigated in acetonitrile-dimethyEomamide mixtures at various temperatures using a spectrophotometric technique. The stoichiometry and
the formation constants of the complexes formed in solution were calculated by
computer refinement of absorbance-mole ratio data using nonlinear least-square
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