钴(Ⅱ)与亚氨基二乙酸和α-氨基酸三元配合物的研究

Studies on Ternary Complexes of Cobalt(Ⅱ)Containing Iminodiacetic Acid and Someα-Amino Acids

用pH法测定钴(Ⅱ)与亚氨基二乙酸(IDA)(作为第一配体)和甘氨酸(Gly)、丙氨酸(Ala)、正缬氨酸(Nor-Val)、苯基丙氨酸(Phe)、蛋氨酸(Met)、丝氨酸(Ser)、天冬酰胺(Asn)(作为第二配体)的三元配合物的稳定常数,也测定了相同条件下诸配体的质子化常数及Co(Ⅱ)-IDA和Co(Ⅱ)-Met二元配合物的稳定常数。讨论了三元配合物的稳定性和潜在三齿配体的配位情况。

The stability constants of ternary complexes of Co(Ⅱ)with iminodiacctic acid(IDA)as the primary ligand and glycine(Gly),Alaninc(Ala),Nor-Valine(Nor-Val),phenyl-alanine(Phc),methionine(Met),Serine(Ser),asparagine(Asn)as the secondary ligand have been determined.Auxiliary data,such as the acid dissociation constants and the binary stability constants of Co(Ⅱ)-IDA and Co(Ⅱ)-Met,have also been obtained under identical conditions.The stability of the ternary complexes and the coordination manner of some potential tridcntate ligands have been discussed in terms of their stability-constant data.