Synthesis, characterization and structures of methylmercury complexes with selenoamino acids
作者:Mohammad A. K. Khan、Abu Md. Asaduzzaman、Georg Schreckenbach、Feiyue Wang
DOI:10.1039/b903863a
日期:——
Four new methylmercury-selenoamino acid complexes were synthesized, including methylmercury-L-selenoglutathionate, methylmercury-D,L-selenopenicillaminate, and two methylmercury-L-selenomethioninate complexes (one via a Hg–Se bonding and the other Hg–N bonding). All the complexes were characterized by NMR (1H, 13C, 77Se and 199Hg), FT-IR and mass spectra. Their molecular structures were established by single crystal X-ray crystallography (for the Hg–N bonding methylmercury-L-selenomethioninate) and by quantum mechanical calculations using Gaussian-03 with the hybrid functional B3LYP/SDD. All four complexes were found to chemically and structurally resemble their sulfur analogues, with a slightly stronger binding affinity of Hg to Se than to S, suggesting chemical and structural mimicry might play a role in methylmercury-selenium antagonism in biological systems.
我们合成了四种新的甲基汞-硒氨基酸复合物,包括甲基汞-L-硒谷胱甘肽、甲基汞-D,L-硒青霉胺和两种甲基汞-L-硒蛋氨酸复合物(一种通过Hg-Se键合,另一种通过Hg-N键合)。所有复合物均通过核磁共振(1H、13C、77Se和199Hg)、傅里叶变换红外光谱和质谱进行了表征。通过单晶X射线晶体学(用于Hg-N键合的甲基汞-L-硒蛋氨酸)和量子力学计算(使用Gaussian-03和混合功能B3LYP/SDD)确定了它们的分子结构。发现这四种复合物在化学和结构上与它们的硫类似物相似,Hg与Se的结合亲和力比与S的结合亲和力稍强,这表明化学和结构模拟可能在生物系统中的甲基汞-硒拮抗中起作用。