Thermodynamic and UV studies of association reaction between phenols and benzil mono benzylidene aniline

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作者：
Azzouz, A.S.P. [1 ]
机构：
[1] Department of Chemistry, College of Education, University of Mosul, Mosul, Iraq
来源：
Zeitschrift fur Physikalische Chemie | 2002年 / 216卷 / 09期
关键词：
Equilibrium constants - Solvents - Complexation - Hydrogen bonds - Absorption spectroscopy - Association reactions - Thermodynamics - Ultraviolet spectroscopy - Aniline;
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摘要：
The study includes two complementary topics. Firstly, the influence of various concentrations of phenols on the UV absorption spectrum of benzil mono benzylidene aniline (BMBA) in different solvents. Experiments show a bathochromic shift in the UV spectrum of BMBA obtained after addition of phenol. When phenol is replaced by 2,4-dimethylphenol, rather similar results are observed. The results are interpreted interms of hydrogen bond formation between BMBA and phenol. Secondly, it is decided to confirm the hydrogen-bond formation stated above by thermodynamic method. Accordingly, the effect of temperature on the equilibrium constant value of the interaction between BMBA and phenol is considered. Evaluated thermodynamic parameters ΔG, ΔH, and ΔS support the interaction stated above by either mono hydrogen-bond of any type O-H N, O-H O or by double hydrogen bonding stated later depending on the pKa of the phenol used.
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页码：1053 / 1060
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