Kinetic studies on acid-catalysed aquation of some [Cr(ox)2(amino acid)]2- complexes

被引：7

作者：

Kita, Ewa ^{[1
]}

Lisiak, Rafal ^{[1
]}

机构：

[1] Nicholas Copernicus Univ, Fac Chem, PL-87100 Torun, Poland

来源：

TRANSITION METAL CHEMISTRY | 2011年 / 36卷 / 08期

关键词：

AMINO-ACIDS; CRYSTAL-STRUCTURES; CHROMIUM; TRIHYDRATE;

D O I：

10.1007/s11243-011-9540-9

中图分类号：

O61 [无机化学];

学科分类号：

070301 ; 081704 ;

摘要：

Three chromium(III) complexes of general formula [Cr(ox)(2)(Aa)](2-) (Aa is an alpha-amino acid, namely alanine, valine or cysteine) were obtained and characterized in solution. In acidic solutions, [Cr(ox)(2)(Aa)](2)-undergo acid-catalysed aquation to cis-[Cr(ox)(2)(H2O)(2)](-) and the appropriate amino acid. The process goes through a metastable intermediate with monodentate amino acid coordinated via the carboxylate oxygen atom. The kinetics of the chelate ring opening were studied under isolation conditions. The determined pseudo-first-order rate constants were linearly dependent on [H+]. A mechanism is proposed, in which the reactive form of substrate is in the form of the conjugate acid.

引用

页码：855 / 860

页数：6

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