Mechanistic study on substitution reaction of a citrato(<i>p</i>-cymene)Ru(<scp>ii</scp>) complex with sulfur-containing amino acids

Aizawa, Shiro; Takizawa, Kohei; Aitani, Momoko

doi:10.1039/c9ra05507j

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2022

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“…Their involvement in copper transport in blood has been reported 1,2 . The amine and carboxylate moieties in amino acids allow them to form compounds with different metal ions 1,[3][4][5][6][7][8] . Many amino acids also have a metal-binding site in the side chain, which helps them to form metal complexes with a range of structural motifs.…”

Section: Introductionmentioning

confidence: 99%

Kinetics and Mechanisms of Ligand-Exchange of Cu(Methionine)2 by Polyamines

2022

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The kinetics of ligand substitution reaction of Cu(methionine)2 complex by polyamines has been followed conductometrically above pH 9.0 at 25 oC. Millimolar solution of the Cu(NO3)2 and methionine in 1:2 molar ratio in water shows increase in conductance with time. When a polyamine (en, dien and trien) is added to the complex, the conductance increases at a rapid rate due to substitution of methionine by polyamine leading to the formation of [Cu(polyamine)2]. It was observed that the exchange of methionine by polyamine proceeds in a first order process. Since the rate of the reaction varies with the size of polyamines they can be placed in the following, en > dien > trien. In acidic pH range the absorption spectrum varies negligibly. However, the concentration of methionine does not have any influence on the absorption spectra.

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