高等学校化学学报 ›› 1995, Vol. 16 ›› Issue (5): 674.

• 论文 • 上一篇    下一篇

N-乙酸基取代四氮杂大环及其镧系配合物的热力学研究

毕建洪1, 胡德银2, 倪诗圣2, 徐济德2   

  1. 1. 安徽省教育学院化学系, 合肥, 230061;
    2. 安徽大学化学系
  • 收稿日期:1994-05-31 修回日期:1994-10-26 出版日期:1995-05-24 发布日期:1995-05-24
  • 通讯作者: 毕洪建,男,36岁,硕士,讲师.
  • 作者简介:毕洪建,男,36岁,硕士,讲师.
  • 基金资助:

    国家自然科学基金

Thermodynamic Studies on the N-Acetic Acid Substituted Tetraazamacrocycle and Its Lanthanide Complexes

BI Jian-Hong1, HU De-Yin2, NI Shi-Sheng2, XU Ji-De2   

  1. 1. Department of Chemistry, Anhui Institure of Education, Hefei, 230061;
    2. Department of Chemistry, Anhui University
  • Received:1994-05-31 Revised:1994-10-26 Online:1995-05-24 Published:1995-05-24

摘要: 用pH电位滴定法分别在25±0.1℃,40±0.1℃和80±0.1℃,0.5mol/LKNO3水溶液中测定了H4L(5,7,12,14-四甲基-1,4,8,11-四氮杂环十四烷-N',N", N"' N""-四乙酸)的逐级质子化常数和焓值。又在40±0.1℃和80±0.1℃条件下测定了H4L与镧系金属离子(La3+,Nd3+,pr3+,Sm3+,Eu3+,Gd3+,Dy3+,Yb3+)配合物的稳定常数。结果表明:配合物稳定性高。

关键词: 四氮杂大环, 镧系配合物, 稳定常数,

Abstract: The protonation constants of the macrocycle H4L (5, 7,12,14-tetramethyl-1,4,8,11-tetraazamacrocyclotetradeca-N',N", N"' N""-tetraacetic acid )were determined by poten tiometric titrations in 0.5 mol/L KNO3solution at 25+0.1℃,40+0.1℃ and 80±0. 1 ℃.The stability constants of the complexes of H4L with La3+,Nd3+, Pr3+,Sm3+,Eu3+,Gd3+,Dy3+,Yb3+were determined by the same method at 40+0. 1℃ and 80±0.1℃.The en thalpies of coordination reaction of H4L with H+in the solution were given.Experimental re sults show that the complexes have high stability.

Key words: Tetraazamacrocyle, Lanthanide complexes, Stability constant, Enthalpy

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