Cyclic voltammetric study of the complexation of Pb2+ ions by dibenzopyridino-18-crown-6 in some nitriles

被引:0
作者
Chojnacka-Kalinowska, G
Kalinowski, MK
机构
[1] Inst Precis Mech, PL-01796 Warsaw, Poland
[2] Warsaw Univ, Fac Chem, PL-02093 Warsaw, Poland
关键词
dibenzopyridino-18-crown-6; Pb2+ complexes; cyclic voltammetry; thermodynamics of complexation;
D O I
暂无
中图分类号
O6 [化学];
学科分类号
0703 ;
摘要
A cyclic voltammetric study of the interaction of Pb2+ ions with dibenzopyridino-18-crown-6 in acetonitrile, propionitrile, butyronitrile, benzyl cyanide and benzonitrile has been carried out at various temperatures. Stability constants of the resulting 1:1 complexes were found to decrease with increasing DN, the solvent donor number. The enthalpy and entropy of complexation were calculated from the temperature dependence of the stability constants; the complexes were enthalpy stabilized, but entropy destabilized in all the solvents under study. The relationships DeltaH(o) vs. DN and DeltaS(o) vs. DN were found.
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页码:1605 / 1610
页数:6
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