稀土四元络合物显色反应的研究  

STUDIES ON COLOR REACTIONS OF QUATERNARY COMPLEXES OF RARE-EARTH METALS

作　　者：孙淑声[1] Sun Shusheng(Department of Chemistry,Peking University,Beijing)

机构地区：[1]北京大学化学系

出　　处：《高等学校化学学报》1982年第3期314-318,共5页Chemical Journal of Chinese Universities

摘　　要：研完了稀土与铬天青S(CAS),4,7-二苯基邻菲哼啉(4,7-dp-phen)和溴化十六烷基三甲铵(CTAB)四元络合物的显色反应。测定了络合物的最大吸收峰、摩尔吸光系数及组成。当乙醇存在时,络合物λ_(max)略有红移,ε值普遍增大。详细地研究了CTAB浓度对四元络合物增色和退色效应以及对不同稀土四元络合物作用的差异。文中拟定了La^(3+)存在时测定微量Gd^(3+)的分析方法。The color reactions of quaternary complexes of rare-earth metals with chromazurol S(CAS),4,7-diphenyl-l,10-phenanthroline and cetyltrimethyl ammonium bromide(CTAB)have been investigated.The absorption maxima of these green complexes appear at 628-642 nm,and their molar absorpti-vities are 1.21×10^(5)-1.49×10^(5)·mole^(-1)·cm^(-1).The composition of the green complex of lutetium is Lu3+:CAS:4,7-dp-phen:CTAB=1:2:1:4.In the presence of ethyl alcohol(7ml),the absorption maxima of the green complexes show that the bathochromic shift and the molar absorptivities become larger.In this system,CTAB exerts either the sensitization effect or the decoloration effect on the color complexes of rare-earth metals at different concentrations.The amount of CTAB required for complete decoloration of different rare-earth complexes is different.Satisfactory results have been obtained by the application of the quaternary complexes in the spectropho-tometric determination of small amounts of gadolinium in the presence of lanthanum.

关 键 词：显色反应 摩尔吸光系数 溴化十六烷基三甲铵 四元络合物 最大吸收峰 稀土 CTAB 分析方法 

分 类 号：O65[理学—分析化学]