VO(Ⅱ)-脯氨酸-邻菲咯啉三元体系的溶液结构及其波谱  

The Solution Structures and Spectra of VO (Ⅱ) -Pro-Phen Ternary System

作　　者：陈德余[1] 史卫良[1] 张仕勇[1] 

机构地区：[1]浙江大学化学系,杭州310027

出　　处：《无机化学学报》2000年第3期450-454,共5页Chinese Journal of Inorganic Chemistry

基　　金：浙江省分析测试基金!(No. 99057)

摘　　要：本文测定了ＶＯＳＯ_４与脯氨酸（Ｐｒｏ）、邻菲咯啉（Ｐｈｅｎ）在不同酸度（ｐＨ＝１～１４）的乙二醇／水（１：１）溶液中的低温（１７３Ｋ）ＥＰＲ波谱，根据不同ｐＨ下的ＥＰＲ谱变化，利用Ｊｏｈｎｓｏｎ的加合规则，并结合配合物的红外光谱推测了它们的可能结构。利用波谱参数计算了配合物的键参数，利用电子光谱数据计算了配合物的晶体场参数，讨论了它们的成配特性。结果表明，随着取代水分子的配体（Ｐｈｅｎ或Ｐｒｏ）数目增加，键参数减小，配合物共价性增强，同时得出Ｐｈｅｎ与ＶＯ（Ⅱ）配位能力比Ｐｒｏ强得多。EPR spectra of VO (Ⅱ) -Pro-Phen system in glycol and water(1:1 ) solution at various acidities have been observed at low temperature (173K). It was found that in different pH ranges different structural complexes were formed. According to Johnson's rule and IR, their possible structures were suggested. The bonding parameters of complexes were calculated by EPR parameters. It can be seen that the δ2 values of complexes decrease as the number of ligands bound to vanadium increases. This means that the covalent bonding between vanadium and ligands increase as Phen and Pro ligands replace water ligands. Using electronic spectral data, the crystal field parameters were calculated. The coordination law was discussed. It was obtained that the coordination capacity of Phen is much stronger than one of Pro.

关 键 词：脯氨酸-邻菲咯啉 VO(Ⅱ)配合物 溶液结构 波谱 

分 类 号：O614.511[理学—无机化学]