稀土元素与NEB二元配合物的pH电位法分析  

Studies on the binary complexes of rare earth metal ions with NEB by potentiometry

作　　者：闫世才[1] 朱元成[1] 郭峰[1] 董小宁[1] 

机构地区：[1]天水师范学院化学系,甘肃天水741001

出　　处：《化学研究与应用》2003年第2期267-269,共3页Chemical Research and Application

摘　　要：The Chemical behavior of binary systems RE(III)-NEB(RE=La→Nd,Sm→Lu,Y;NEB=2,2′,2″nitrilotris(2,1ethanediyloxy)tris benzoic acid)were investigated potentiometrically at 25℃ and 020 mol/L(KNO3)ion strength in 50% methanolwater mixture.Computer programs MAGEC?MINIQUAD82 and MIQUV were employed for obtaining the results.It was found that two chemical models of binary complexes 112 and 111(RE∶L∶H,L=deprotonated NEB,H=proton)were existed in researching systems,and an apparent"tetrad effect"was also observed for the stability constants logβ112 and logβ111.In addition,the relative position of ytterbium was discussed.The Chemical behavior of binary systems RE(III)-NEB(RE=La→Nd,Sm→Lu,Y;NEB=2,2′,2″nitrilotris(2,1ethanediyloxy)tris benzoic acid)were investigated potentiometrically at 25℃ and 020 mol/L(KNO3)ion strength in 50% methanolwater mixture.Computer programs MAGEC?MINIQUAD82 and MIQUV were employed for obtaining the results.It was found that two chemical models of binary complexes 112 and 111(RE∶L∶H,L=deprotonated NEB,H=proton)were existed in researching systems,and an apparent'tetrad effect'was also observed for the stability constants logβ112 and logβ111.In addition,the relative position of ytterbium was discussed.

关 键 词：稀土 NEB 二元配合物 PH电位法 氨三乙氧基三苯甲酸 

分 类 号：O614.33[理学—无机化学]