A differential pulse polarographic investigation of the complex formation between Tl+ and some macrocyclic ligands in binary acetonitrile plus dimethylformamide mixtures

被引：0
|
作者：
Fakhari, AR
Mousavi, MF [1 ]
Rahmanifar, MS
机构：
[1] Tarbiat Modares Univ, Dept Chem, Tehran, Iran
[2] Shahid Beheshti Univ, Dept Chem, Tehran, Iran
来源：
IRANIAN JOURNAL OF SCIENCE AND TECHNOLOGY | 2000年 / 24卷 / 02期
关键词：
thallium; crown complexes; polarography; macrocyclic ligands; solvent effect; stability;
D O I：
暂无
中图分类号：
O [数理科学和化学]; P [天文学、地球科学]; Q [生物科学]; N [自然科学总论];
学科分类号：
07 ; 0710 ; 09 ;
摘要：
The interaction between Tl+ ion and some macrocyclic ligands such as: 18-crown-6 (18C6), dicyclohexyl-18-crown-6 (DC18C6), Aza-18-crown-6 (A18C6), dibenzo-18-crown-6 (DB18C6) and 15-crown-5 (15C5) was studied in various binary solvent mixtures of acetonitrile (AN) + dimethylformamide (DMF) at 20 degrees C, using a differential pulse polarographic technique. The stoichiometry and stability of the complexes were determined by monitoring the shift in peak potential of the DP peaks of the metal ion against the ligand concentration. In all the solvent mixtures used, the stability of the resulting 1:1 complexes was found to vary in the order: DC18C6 > A18C6 > 18C6 > 15C5 > DB18C6. There is an inverse relationship between the formation constant and the amount of DMF in the mixed solvent; in all cases, a linear relationship was observed between log K-f and the mole fraction of DMF.
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页码：183 / 188
页数：6
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