高等学校化学学报

高等学校化学学报 ›› 1997, Vol. 18 ›› Issue (8): 1251.

• 论文 • 上一篇    下一篇

N-二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, 赵祥大2, 倪诗圣2, 谢复新2   

  1. 1. 安徽教育学院化学系, 合肥 230061;
    2. 安徽大学化学系, 合肥 230039
  • 收稿日期:1996-08-05 出版日期:1997-08-24 发布日期:1997-08-24
  • 通讯作者: 毕建洪, 男, 37岁, 硕士, 副教授.
  • 作者简介:毕建洪, 男, 37岁, 硕士, 副教授.
  • 基金资助:

    国家自然科学基金

Thermodynamic Studies on N-Diacetic acid substituted tetraazamacrocycle and Its Lanthanide Complexes

BI Jian-Hong1, ZHAO Xiang-Da2, NI Shi-Sheng2, XIE Fu-Xin2   

  1. 1. Department of Chemistry, Anhui institute of Education, Hefei 230061;
    2. Department of Chemistry, Anhui University, Hefei 230039
  • Received:1996-08-05 Online:1997-08-24 Published:1997-08-24

PDF (PC)

被引次数

7

摘要： 用pH电位滴定法测定了H2L(C－meso－meso－5,12-二苯基-7,14-二甲基-1,4,8,11-四氮杂环十四烷-N,N"-二乙酸)的逐级质子化常数,并进一步计算出配位反应的热焓和熵变.在(40±0.1)℃条件下测定了H2L与调系金属离子(La3+,Nd3+,Pr3+,Sm3+,Eu3+,Gd3+,Dy3+,Yb3+)形成1：1型配合物的稳定常数.用热力学稳定性的观点讨论了大环的尺寸效应和空间位阻等因素对配位稳定性的影响.

关键词: 四氮杂大环, 镧系配合物, 稳定常数, 热焓

Abstract: The protonation constants of the macrocycle H2L(C-meso-meso-5, 12-diphenyl-7,14-dimethyl-1, 4, 8, 11-tetraazamacrocyclotetradecane-N, N"-diacetic acid) were determined by potentiometric titration in 0.5mol/L KCl solution at (25±0.1)℃, (30±0.1)℃ and (40±0.1)℃.The changes of enthalpy and entropy in the coordination reaction of H2Lwith H+ in the solution were given. The stability constants of the complexes of H2L with La3+,Nd3+, Pr3+, Sm3+, Eu3+, Gd3+, Dy3+ and Yb3+ were determined by the same method at (40±0.1)℃. The experiment results obtained were discussed.

Key words: Tetraazamacrocycle, Lanthanide complex, Stability constant, Enthalpy

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