Palladium complexes with biological ligandsIII. Kinetics and reaction mechanism of the interaction of Pd(II) with methionine and S-methyl-l-cysteine
1987; Elsevier BV; Volume: 6; Issue: 6 Linguagem: Inglês
10.1016/s0277-5387(00)80900-6
ISSN1873-3719
AutoresHayat M. Marafie, Nadyah M. Shuaib, Mohamed S. El‐Ezaby,
Tópico(s)Lanthanide and Transition Metal Complexes
ResumoTwo rate steps have been observed when excess Pd(II) was reacted with methionine (Meth) and S-methyl-l-cysteine (SMC) in the pH range 1–3.5. The fast step in both systems was attributed to the formation of a mononuclear chelated complex, and the slow step may be due to the effect of hydrolysis and/or polymerization processes. The mechanism of the fast reaction was discussed in terms of the species PdCl42−, [PdCl3(OH)]2−, H2L+ and HL (L = Meth or SMC). It was concluded that [PdCl3(OH)]2− was the more reactive species in the complex formation reaction. It was also found that substitution reactions involving Meth were more labile than those involving SMC.
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