FTIR, XAS, and XRD study of cadmium complexes with L-cysteine

被引：42

作者：

Parsons, Jason G. ^{[3
]}

Dokken, Kenneth M. ^{[1
]}

McClure, John ^{[2
]}

Gardea-Torresdey, Jorge L. ^{[1
]}

机构：

[1] Univ Texas El Paso, Dept Chem, El Paso, TX 79968 USA

[2] Univ Texas El Paso, Dept Met & Mat Engn, El Paso, TX 79968 USA

[3] Univ Texas Pan Amer, Dept Chem, Edinburg, TX 78539 USA

来源：

POLYHEDRON | 2013年 / 56卷

基金：

美国国家卫生研究院; 美国国家科学基金会;

关键词：

Cadmium(II) L-cysteine complexes; XAS; Phytochelatin model compound; Metallothionine model system; RAY-ABSORPTION SPECTROSCOPY; SOLID-STATE; MOLECULAR-STRUCTURE; THIOL COMPLEXES; COORDINATION; CRYSTAL; SEEDLINGS; EXAFS;

D O I：

10.1016/j.poly.2013.04.001

中图分类号：

O61 [无机化学];

学科分类号：

070301 ; 081704 ;

摘要：

Cysteine (cys) plays a vital role in the detoxification of cadmium (Cd), but the coordination of this metal to cys is not well understood, although extensively studied. In this investigation, our results showed that the ratio Cd:cys 1:2 precipitate as a amorphous white powder, the Cd:cys 1:4 provided for a viscous liquid without precipitating, while the Cd:cys 1:6 resulted in long, clear, needle-like crystals. FTIR and XAS analysis indicated that cys was coordinated to Cd through S ligands on the cys. EXAFS of the Cd:cys products showed small differences in the coordination environment. The complex from Cd:cys 1:2 reaction displayed two different Cd-S interactions at 2.69 and 2.54 angstrom, each consisting of two neighboring atoms. The complex from the Cd:cys 1:4 reaction showed four equally distant Cd-S interactions at 2.47 angstrom. The comples from the Cd:cys 1:6 reaction exhibited a Cd-S interaction of four S ligands at approximately 2.54 angstrom. All the Cd:cys complexes had a tetrahedral arrangement of S ligands around the central Cd atom. The XRD demonstrated that the Cd:cys 1:2 and 1:4 reaction products were amorphous and no diffraction peaks were observed. However, the Cd:cys 1:6 reaction product showed strong diffraction peaks, crystallizing into a monoclinic unit cell (C2/C). (c) 2013 Elsevier Ltd. All rights reserved.

引用

页码：237 / 242

页数：6

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