Studies of charge transfer complex equilibria on iodine-thiazoles by constant activity method

The iodine charge transfer complexes of thiazole, 4-methylthiazole, 2,4-dimethylthiazole, and benzothiazole in carbon tetrachloride have been studied by the constant activity method. The equilibrium characteristics of the CT complexes formed were measured. It was concluded that the CT complexes are...

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Bibliographic Details
Published in:Spectrochimica acta. Part A: Molecular spectroscopy 1987, Vol.43 (4), p.497-499
Main Authors: Abdel-Hamid, Refat, El-Samahy, Ahmed A., Abdel-Rahman, Mahmoud A., El-Sagher, Hussein
Format: Article
Language:English
Subjects:
Atomic and molecular physics
Exact sciences and technology
Molecular properties and interactions with photons
Molecular spectra
Physics
Ultraviolet spectra
Visible spectra
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Summary:The iodine charge transfer complexes of thiazole, 4-methylthiazole, 2,4-dimethylthiazole, and benzothiazole in carbon tetrachloride have been studied by the constant activity method. The equilibrium characteristics of the CT complexes formed were measured. It was concluded that the CT complexes are of the n-σ* nature and the donating site for the charge transfer interaction is the lone pair of electrons on the nitrogen atom. Moreover, the effect of substitution on the CT equilibrium was also studied. The equilibrium constants have been found to be satisfactorily correlated with the pK values of the respective thiazole derivatives. This can be attributed to the lone pair of electrons on nitrogen being more localized on increasing the donating power of substituent. Hence, the electron density on the nitrogen atom increases and an increase in equilibrium constant was seen.
ISSN:0584-8539
DOI:10.1016/0584-8539(87)80050-8