氨基酸-银反应的光化学特点

The Photochemistry Properties on Reactions of Amino Acids and Silver

氨基酸与银的反应是一个不借外加能量热力学上即可进行的过程,但当引入光之后,可改变反应速率.研究发现:Soret带出现吸收所需光照度的大小顺序为Asp Ag(I)>Thr Ag(I)>Tyr Ag(I)>Lys Ag(I),对于Cys Ag(I)体系,Cys的α羧基氧、α氨基的氮与银(I)结合时光照有利于反应的进行,而S原子与银(I)结合与光照度几无关系.此反应是光助化学反应.

The reaction of amino acids and silver is a thermal spontaneous process without additional energy. But when light introduced into the system the reaction speed will be changed. According to our research, the order of light intensity when absorption at Soret-band found is as follows: Asp-Ag(I)>Thr-Ag(I)>Tyr-Ag(I)>Lys-Ag(I). For Cys-Ag system, the reactions between oxygen of α-carboxyl group and nitrogen of α-amino group with silver(I) ion were promoted by lighting. But the reaction of S atom and silver (I) ion was no relations with light intensity. These processes are light-assistance reactions.