Potentiometric and thermodynamic studies of 5-(4′-sulfonylazidophenylazo)-3-phenyl-2-thioxothiazolidin-4-one and its metal complexes

被引：14
作者：
Mubarak, AT [1 ]
机构：
[1] King Khalid Univ, Coll Sci, Dept Chem, Abha 61413, Saudi Arabia
来源：
JOURNAL OF SOLUTION CHEMISTRY | 2004年 / 33卷 / 02期
关键词：
5-(4 '-sulfonylazidophenylazo)-3-phenyl-2-thioxothiazolidin-4-one; potentiometry; dissociation constant; stability constants; thermodynamic parameters;
D O I：
10.1023/B:JOSL.0000030282.00934.91
中图分类号：
O64 [物理化学（理论化学）、化学物理学];
学科分类号：
070304 ; 081704 ;
摘要：
The proton dissociation constant of 5-(4'-sulfonylazidophenylazo)-3-phenyl-2-thioxothiazolidin-4-one (SPT) and the stability constants of its complexes with some metal ions were calculated potentiometrically in 0.1 M KCl and 40% (v/v) ethanol-water mixture. The order of stability was found to be Mn2+ < Co2+ < Ni2+ < Cu2+ < Zn2+. The effect of temperature on the dissociation of SPT and the stability of its complexes were studied. The corresponding thermodynamic functions were derived and discussed. The dissociation process is unspontaneous, endothermic, and entropically unfavorable. The formation of the metal complexes was found to be spontaneous, endothermic and entropically favorable.
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页码：149 / 155
页数：7
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