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Original Articles

Kinetic and mechanistic analysis of ligand substitution of aquapentacyanoruthenate(II) in SDS medium by 4,4′bipyridine

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Pages 1045-1050 | Received 04 Jan 2019, Accepted 28 Apr 2019, Published online: 09 Jul 2019
 

Abstract

Substitution of coordinated water molecule from the coordination sphere of [Ru(CN)5H2O]3− with nitrogen donor ligand 4,4′Bipyridine (BipY) was studied in anionic micellar medium under pseudo first order condition as a function of ionic strength, pH, reactants concentration and temperature at 390 nm λmax of orange colored product [Ru(CN)4BipY]2−. The reaction was independent of [Ru(CN)5H2O]3− while it exhibited first order kinetics in [BipY] in the selected concentration range. The variation in ionic strength had negative effect on substitution rate. The surfactant SDS has negative charge similar to that of the complex [Ru(CN)5H2O]3−, therefore does not show any significant effect on the reaction rate except at concentration higher than critical micelle concentration. A suitable mechanism involving the ion pair dissociation of complex [Ru(CN)5H2O]3− and ligand BipY has been proposed. The activation parameters ΔH, ΔS and Ea with respect to the slowest step of the mechanism were computed which supports the proposed mechanistic scheme.

Graphical Abstract

Acknowledgement

One of the authors Richa Rastogi is thankful to head department of chemistry, Lucknow University, Lucknow for providing necessary research facilities to perform this work for her Ph. D degree.

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