高等学校化学学报

高等学校化学学报 ›› 1996, Vol. 17 ›› Issue (5): 786.

• 论文 • 上一篇    下一篇

meso-四(4-磺苯基)卟啉对铕(Ⅲ)与羧酸络合物电还原的催化作用

乔庆东, 高小霞   

  1. 北京大学化学系, 北京 100871
  • 收稿日期:1995-05-29 出版日期:1996-05-24 发布日期:1996-05-24
  • 通讯作者: 高小霞
  • 作者简介:乔庆东,男, 28岁,博士,现在辽宁抚顺石油化工学院.
  • 基金资助:

    国家自然科学基金

Electro-catalytic Effect of meso-Tetra(4-sulfophenyl)·porphyrin on Voltammetric Behavior of Some Eu(Ⅲ)Carboxylic Acid Complexes in Aqueous Solution

QIAO Qing-Dong, GAO Xiao-Xia   

  1. Department of Chemistry, Peking University, Beijing 100871
  • Received:1995-05-29 Online:1996-05-24 Published:1996-05-24

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摘要： 水溶液中Eu3+与meso-四(4-磺苯基)卟啉(TPPS)不易形成卟啉络合物,但在乙酸、酒石酸、丙二酸等共存时,在循环伏安图上可得一对Eu3+还原-氧化的可逆或准可逆峰,此峰与Eu3+在NaClO4底液中的还原峰相比,峰电位正移,峰电流增高。从6种Eu3+-羧酸络合物与TPPS共存时的实验中证明这些络合物并没有和TPPS形成三元络合物,而是吸附在汞电极上的TPPS产生电催化作用。

关键词: TPPS, Eu3+-羧酸络合物, 电催化作用

Abstract: It is difficult to synthesize the complexes of rare earth ions with meso-tetra(4-sulfophenyl)porphyrin(TPPS)in aqueous solution.Eu(Ⅲ)can form complexes with carboxylic acids, such as acetic,tartaric, malonic, gluconic, citric acids and EDTAwith different stability constants,and exhibits irreversible or quasi-reversible redox peaks in cyclic voltammograms.TPPS, which adsorbed on Hg electrode,exerts catalytic effect on the redox behvior of Eu(Ⅲ)-acetic, tartaric, malonic acid complexes by changing the irreversible process to a reversible one, but the Eu(Ⅲ)-TPPScomplex was not formed.The mechanism of such a catalytic effect has been discussed.

Key words: TPPS, Eu(Ⅲ)-carboxylic acid complex, Electro-catalytic effect

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