稀土金属离子钇(Ⅲ)-氨基多羧酸配合物结构的研究  

Investigation on Molecular Structures of Y(Ⅲ) Complexes with Aminopolycarboxylic Acids

作　　者：刘振荣[1] 王君[1] 张向东[1] 贾卫国[1] 姜玉春[1] 

机构地区：[1]辽宁大学化学系,辽宁沈阳110036

出　　处：《辽宁大学学报（自然科学版）》2003年第1期77-81,共5页Journal of Liaoning University：Natural Sciences Edition

摘　　要：介绍了稀土金属离子YⅢ 与一系列氨基多羧酸类配体形成配合物的合成及分子结构和晶体结构 ,并讨论了这些配合物的配位规律及形成原因 .发现具有 0 .10 4nm离子半径和d0 电子结构的稀土金属YⅢ离子一般情况下与氨基多羧酸类配体形成九配位结构的配合物 ,如K3 [YⅢ(nta) 2 (H2 O) ]·6H2 O(nta =氨三乙酸 ) ,Na[YⅢ(edta) (H2 O) 3 ]·5H2 O(edta =乙二胺四乙酸 ) ,K2 [YⅢ(dtpa) (H2 O) ]·7H2 O(dtpa =二乙三胺五乙酸 ) ,K4[YⅢ2 (Httha) 2 ]·14H2 O(ttha =三乙四胺六乙酸 )和 (NH4) 2 [YⅢ(NH4ttha) ]·5H2 O等 ,但与具有一定刚性的环己烷环的cydta(=反式 1,2 环己二胺四乙酸 )配体却形成了八配位NH4[YⅢ(cydta)(H2 O) 2 ]·4 .5H2 O配合物 .另外 (NH4) 2 [YⅢ(NH4ttha) ]·5H2 O配合物中具有可用于修饰的未配位的自由羧酸基 ( CH2 COO-) .In this paper the syntheses and the molecular and crystal structures of the Y Ⅲ complexes with aminopolycarboxylic acids were described and the coordination laws and formation reasons were discussed. It was found that the Y Ⅲ ion having ionic radius of 0.104 nm and electronic configuration of d 0 in general should form the nine coordinate complexes with aminopolycarboxylic acid ligands, for example:K 3[Y Ⅲ(nta) 2(H 2O)]·6H 2O(nta=nitrilotriacetic acid), Na[Y Ⅲ(edta)(H 2O) 3]·5H 2O(edta=ethylene diaminetetraacetic acid), K 2[Y Ⅲ(dtpa)(H 2O)]·7H 2O(dtpa=diethylenetriaminepentaacetic acid), K 4[Y Ⅲ 2- (Httha) 2]·14H 2O(ttha=trrethylenetetraaminehexaacetic acid) and (NH 4) 2[Y Ⅲ(NH 4ttha)]·5H 2O, etc. However, the Y Ⅲ ion form the eight coordinate complexe with cydta(= trans 1,2 cyclohexanediaminetetraacetic acid) having definite rigid annular hexamethylene, for example: NH 4[Y Ⅲ(cydta)(H 2O) 2]·4.5H 2O. Otherwise, there was a non coordinate free carboxylic group( CH 2COO -) being modified in the nine coordinate complex (NH 4) 2[Y Ⅲ(NH 4ttha)]·5H 2O.

关 键 词：稀土金属离子 钇 氨基多羧酸 配合物 分子结构 晶体结构 配位规律 合成方法 

分 类 号：O614.322[理学—无机化学]