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Complexes of hydroxamates X. Interaction of methioninehydroxamic acid with Ni(II) and Pd(II). Kinetics and reaction mechanism

✍ Scribed by Hayat M. Marafie; Nadia Shuaib; Khalid Ibrahim; Mohamed S. El-Ezaby

Publisher
John Wiley and Sons
Year
1995
Tongue
English
Weight
722 KB
Volume
27
Category
Article
ISSN
0538-8066

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✦ Synopsis

The kinetic stopped flow method has been used to study the reaction rates of Ni(I1) and Pd(I1) with methioninehydroxamate (Mx). Two reaction rates were observed in the MX-Ni(I1) system whereas three rates were observed in the MX-Pd(II) system. Most of the rate steps were dependent on pH as well as on T m (total concentration of methioninehydroxamate). The observed pseudo-first-order rate constants at constant pH are expressed empirically as Kkbs = m, + rn; Tim. The parameters m, and ml are pH-dependent. It has been concluded that hydroxy metal species contributed to the explanation of the rate of the metal complexation with MX. Similar systems have been correlated with the systems of current work.

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Factors affecting the stability of the hydroxamic acid-iron complex have been studied. It has been shown that the iron concentration is the most important factor for complex stability. Conditions for a stable complex have been developed and found to be superior to those utilizing HzOz. An assay fo