摘要
本文在２５．０±０．１℃，Ｉ＝０．１ｍｏｌ·ｄｍ（－３）ＫＮＯ３存在下，采用ｐＨ法测得了５－取代邻菲罗啉的质子化常数以及钴（Ⅱ）与５－取代邻菲罗啉、α－氨基酸的二元、三元配合物的稳定常数．结果表明三元配合物的稳定性与５－取代邻菲罗啉的质子化常数、取代基常数均存在直线自由能关系．并用三元配合物稳定性的表征值ｌｏｇＫＭ、△ｌｏｇＫ，讨论了三元配合物的稳定性，发现钴（Ⅱ）与配体５－取代邻菲罗啉之间也存在着ｄ－ｐ反馈π键．该π健的强度对三元配合物稳定性有着显著影响．
The stability constants of binary and ternary complexes of Co(Ⅱ)-5-Rphen-α-aminoacids were studied by pH titration method at 25.0±0.1℃, in the presense of 0.1mol·dm(-3) KNO3. The protonation constants of ligands Rphen and the stability constants of binary and ternary complexes co(Ⅱ)-5-Rphen-α-aminoacids were determined.The results show that linear free energy relationships exist between the stability constants of ternary complexes and the protonation constants of ligands Rphen and the Hammett parameters of substituents of Rphen.The stability of ternary complexes were discussed in terms of logKM and △logK. It was found that the d-p back-donation π bonding may exist between Co(Ⅱ) and 5-Rphen.
出处
《无机化学学报》
SCIE
CAS
CSCD
北大核心
1994年第4期363-369,共7页
Chinese Journal of Inorganic Chemistry
基金
国家自然科学基金
关键词
钴
取代邻菲罗啉
氨基酸
三元络合物
稳定性
stability constant d-p hack-donation π bonding cobalt(Ⅱ) 5-substituted phenanthroline α-aminoacid
