不对称变色酸双偶氮类试剂与贵金属、稀土元素某些反应机理的研究  

A Primary Investigation of Some Reaction Mechanisms of Unsymmetric Bis-Arylazo Derivative of Chromotropic Acid and Precious Metals and Rare Earth Elements

作　　者：朱利亚[1] 尹家元[2] 徐其亨[2] 

机构地区：[1]昆明贵金属研究所,中国昆明650221 [2]云南大学化学系,中国昆明650091

出　　处：《贵金属》2001年第4期31-38,30,共9页Precious Metals

摘　　要：利用光度分析实验、水合离子半径理论和试剂结构研究并初步探讨了DBC -偶氮胂与轻、重稀土显色反应机理 ,得出轻稀土元素与DBC -偶氮胂在高酸度时较易形成络合物 ,而重稀土元素与之在低酸度时较易形成络合物的规律。用显色络合物络合比和试剂结构研究并初步探讨了不对称变色酸双偶氮类衍生物与贵金属元素的络合机理。并证明 2价铂族元素与该类试剂形成 1∶1络合物 ,而 3价铂族元素与之形成A primary investigation of color reaction mechanism of DBC-arsenazo and light or heavy rare earth elements was carried out using the spectrophotometric experiments.The theory of hydrated ion radius and constitution of reagent.It was found that the complex can be formed under high acidity between light rare earth elements and DBC-arsenazo and under low acidity between heavy rare earth elements and DBC-arsenazo.The complexing mechanism of unsymmetric bis-arylazo derivative of chromotropic acid and precious metal elements was studied using composition ratio of the color complex and constitution of reagents.Research has showed that complex of 1∶1 can be made up of platinum group elements with two valences and the reagents,and complex of 1∶2 can be composed of platinum group elements with three valences and the reagents.

关 键 词：反应机理 不对称变色酸双偶氮类 试剂 贵金属 稀土 

分 类 号：O614.82[理学—无机化学] O614.33[理学—化学]