THERMODYNAMIC STUDY OF THE COMPLEXATION OF SOME THIACROWN ETHERS AND IODINE MONOBROMIDE IN CARBON TETRACHLORIDE SOLUTION

被引：0

作者：

Semnani, Abolfazi ^{[1
]}

Firooz, Ali Reza ^{[2
]}

Pouretedal, Hamid Reza ^{[3
]}

Keshavarz, Mohammad Hossein ^{[3
]}

机构：

[1] Univ Shahrekord, Fac Sci, Shahrekord, Iran

[2] Univ Isfahan, Fac Sci, Dept Chem, Esfahan, Iran

[3] Malek e Ashlar Univ Technol, Dept Chem, Shahin Shahr, Iran

来源：

HETEROCYCLIC COMMUNICATIONS | 2008年 / 14卷 / 05期

关键词：

Spectrophotometry; Thiacrown ethers; Iodine monobromide; Thermodynamic; Carbon tetrachloride;

D O I：

暂无

中图分类号：

O62 [有机化学];

学科分类号：

070303 ; 081704 ;

摘要：

Complexation of TT9C3, TT12C4 and HT18C6 as n-donor, with IBr as a-acceptor has been studied at different temperatures in carbon tetrachloride solution. Spectrophotometric measurements have been carried out to obtain the stoichiometry, the equilibrium constants and thermodynamic parameters. The equilibrium constants of the resulting 1: 1 complexes are calculated from the fitting of the absorbance mole ratio data in MATLAB software and found to vary in the order: HT18C6>TT9C3>TT12C4. The Delta H degrees, Delta S degrees and Delta G degrees values are obtained by the logK(f) vs. 1/T plots. All of the complexes are enthalpy stabilized and entropy destabilized. The contribution of various factors on Delta H degrees and Delta S degrees are discussed. The plot of T Delta S degrees vs. Delta H degrees is linear. The possible reasons for such linearity are discussed.

引用

页码：307 / 318

页数：12

共 43 条

[1] ELECTRONIC SPECTRAL STUDIES OF SOLVENT EFFECTS ON CHARGE-TRANSFER COMPLEX OF ETHYLENE THIOUREA-IODINE SYSTEM [J].