Complexation study of UO22+ ion with 18-crown-6, dicyclohexyl-18-crown-6 and dibenzo-18-crown-6 in binary nitromethane-acetonitrile mixtures by a competitive NMR technique using 7Li nucleus as a probe

被引：0
作者：
Karkhaneei, E
Zebarjadian, MH
Shamsipur, M [1 ]
机构：
[1] Razi Univ, Dept Chem, Kermanshah, Iran
[2] Bu Ali Sina Univ, Dept Chem, Hamadan, Iran
来源：
POLISH JOURNAL OF CHEMISTRY | 2003年 / 77卷 / 02期
关键词：
competitive Li-7 NMR; UO22+ ion; crown ethers; complexation; stability; binary mixed solvents;
D O I：
暂无
中图分类号：
O6 [化学];
学科分类号：
0703 ;
摘要：
Lithium-7 NMR measurements were used to determine the stability of 1: 1 Li+ complexes with 18-crown-6 (18C6), dicyclohexyl-18-crown-6 (DC18C6) and dibenzo-18-crown-6 (DB18C6) in various binary nitromethane-acetonitrile mixtures. A competitive (LiNMR)-Li-7 of UO22+ technique was also employed to probe the complexation U-2(2+) ion with these crown ethers in the mixed solvents used. In all solvent mixtures, the stability of the resulting 1: 1 complexes was found to decrease in the order DC 18C6 > 18C6 > DB18C6. There is an inverse relationship between the complex stability and the amount of acetonitrile in the mixed solvents.
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页码：227 / 235
页数：9
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