Тип публикации: статья из журнала
Год издания: 2016
Идентификатор DOI: 10.1080/00958972.2016.1139095
Ключевые слова: Palladium(II), organic disulfides, kinetics, stability constant, spectrophotometry
Аннотация: Stoichiometry, equilibria, and kinetics of [PdCl4](2-) interactions with l-cystine (H(4)CysS(2+)) and cystamine (H(2)Cyst(2+)) have been investigated spectrophotometrically in strong hydrochloric acidic media. Interactions lead to the formation of highly stable S/(S,N)-coordinated binuclear, and then with excess [PdCl4](2-) trinuclear (S,S,N) or tetranuclear (S,S,N,N) species without disulfide bond cleavage. The reaction of [PdCl4](2-) with H(4)CysS(2+) or H(2)Cyst(2+) at [PdCl4](2-) excess has irreversible first-order kinetics, and with H(4)CysS(2+) or H(2)Cyst(2+) excess, by irreversible parallel reaction of [PdCl4](2-) addition to the ligand. The influence of leaving groups on the kinetics has been explained in terms of formation of stable ionic pairs with complex species and of efficient overlap of d and p orbitals in a transition state. The reactions proceed through an associative mechanism with the first step being formation of the S-coordinated complex. Coordination models and mechanisms have been proposed. Applicability of spectrophotometry for establishment of disulfide bond state in organic disulfides in complexation processes has been demonstrated. [GRAPHICS] .
Издание
Журнал: JOURNAL OF COORDINATION CHEMISTRY
Выпуск журнала: Vol. 69, Is. 5
Номера страниц: 748-762
ISSN журнала: 00958972
Место издания: ABINGDON
Издатель: TAYLOR & FRANCIS LTD
Персоны
- Petrov A.I. (Institute of Non-Ferrous Metals and Materials Science,Siberian Federal University)
- Golovnev N.N. (Institute of Non-Ferrous Metals and Materials Science,Siberian Federal University)
- Dergachev I.D. (Department of Chemistry,University of Nevada)
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