MANGANESE(II) AND NICKEL(II) COMPLEXES OF SOME 2-(POLYHYDROXYALKYL)THIAZOLIDINE-4-CARBOXYLIC ACID-DERIVATIVES

被引:7
作者
GAJDA, T [1 ]
BUZAS, N [1 ]
NAGY, L [1 ]
BURGER, K [1 ]
机构
[1] ATTILA JOZSEF UNIV,DEPT INORGAN & ANALYT CHEM,POB 440,H-6701 SZEGED,HUNGARY
关键词
D O I
10.1016/S0277-5387(00)83702-X
中图分类号
O61 [无机化学];
学科分类号
070301 ; 081704 ;
摘要
The manganese(II) and nickel(II) ion coordination equilibria of some 2-(polyhydroxyalkyl)thiazolidine-4-carboxylic acid (PHTAC) derivatives were studied by potentiometric titration in the pH range 2-11. Nickel(II) parent complexes with (1, 1, 0) and (1, 2, 0) compositions and manganese(II) complexes with (1, 1, 0) composition were formed. In both systems, mixed-ligand complexes involving hydroxide ion coordination and/or further deprotonation of the alcoholic hydroxy groups of the sugar moieties were observed at pH > 6. EPR measurements indicated that in alkaline solution all the manganese(II)PHTAC complexes are dimeric. The magnitudes of the complex-formation constants were shown to depend on the conformation of the hydroxy groups on the first carbon atoms of the polyol chains.
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页码:2237 / 2243
页数:7
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