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Abstract
Abstract The kinetics of substitution of aqua-ligands from above title complex by 1,10-phenanthroline in aqueous medium has bean studied spectrophotometrically at different temperatures (40–55 °C). The following rate law has been established for the reaction systems at pH 5.6. where L and tap represent 1,10-phenanthroline and 2-(m-tolylazo)pyridine respectively, k1 is the water dissociation rate constant of [Ru(tap)2(H2O)2]2+ (i.e. complex 1), k−1 is the aquation rate constant, and k2 is the ligand capturing rate constant of the penta coordinated intermediate, [Ru(tap)2(H2O)]2+. Ionic strength has a very little effect on the rate constants. The rate increases with the increase in pH in the range of 4.5 to 6.0. Activation parameters (ΔH≠ and ΔS≠) were also calculated. Experimental results are consistent with a dissociative mechanism. The solvent effect study was used to verify the mechanistic conclusion.
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