摘要
在25.0±0.1C和0.1mol·dm^(-3)KNO_3存在下,用pH法测定了邻菲罗啉、5-硝基邻菲罗啉、5-氯邻菲罗啉、5-甲基邻菲罗啉为第一配体;脯氨酸、α-氨基异丁酸、异亮氨酸、缬氨酸、甘氨酸、丝氨酸为第二配体与铜(Ⅱ)形成三元配合物的稳定常数,结果表明三元配合物的稳定性与第一配体和第二配体的酸碱强度之间均存在直线自由能关系,应用反馈π键存在的程度讨论了配合物稳定性的变化趋势。
The stability constants of the ternary systems of copper(Ⅱ) with 5-substituted phenanthrolines (1,10-phenanthroline, 5-nitro-1,10-phenanthroline, 5-chloro-1.10-phcna nthroline or 5-methyl-1,10-phenanthroline as the first ligand and with α-aminoacids (proline, α-aminoisobutyric acid, isoleucine,valine,glycine or senne) as the second ligand have been determined by potentiometric titration in aqueous solution at 25℃ and I=0.1 mol·dm-3KNO3. The results showed that some linear free energy relationships are found to exist between the stability of the ternary complexes and the base strengths of the first ligands and the second ligands as well. The tendency of stability of the ternary complexes may be accounted for by the formation of d-p back bonding between copper(Ⅱ) and 5-substituted-1, 10-phenanthroline.
出处
《无机化学学报》
SCIE
CAS
CSCD
北大核心
1990年第2期171-175,共5页
Chinese Journal of Inorganic Chemistry
关键词
铜配合物
氨基酸
取代邻菲罗啉
linear free energy relationship 5-substituted-1,10-phenanthroline a-aminoacid copper
