Spectroscopic Studies of the Complexation of Iodine with Antihistamine Drugs in Solvents of Varying Relative Permittivity |
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Authors: | M Pandeeswaran E H El-Mossalamy K P Elango |
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Institution: | 1. Department of Chemistry, Gandhigram Rural University, Gandhigram, 624 302, India 2. Department of Chemistry, Faculty of Science, King Abdulaziz University, P.O. Box 80203, Jeddah, 21589, Saudi Arabia
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Abstract: | The interaction of oxatomide (OXA), azacyclonol (AZA) and chloropheniramine (ClPA) antihistamine drugs with iodine was studied spectrophotometrically in different solvents and at three different temperatures. The electronic, FT-IR, far-IR, and mass spectra of the resulting charge-transfer (CT) complexes were recorded, in addition to thermal analysis. The results obtained show that the stoichiometries of the reactions are all 1:1. The observed time dependence of the CT band and subsequent formation of $ {\text{I}}_{3}^{ - } $ in solution were related to the slow transformation of the initially formed 1:1 (donor: I2) outer complex to an inner complex (electron donor?Cacceptor), followed by a fast reaction of the inner complex with iodine to form a triiodide ion. The characteristic strong absorptions of $ {\text{I}}_{3}^{ - } $ are observed around 360?nm. The CT-complexes have the formulae (OXA)I]+ $ {\text{I}}_{3}^{ - } $ , (AZA)I]+ $ {\text{I}}_{3}^{ - } $ and (ClPA)I]+ $ {\text{I}}_{3}^{ - } $ . The formation constants (K), molar absorption coefficients (?? CT), and thermodynamic parameters ??H #, ??S # and ??G # of these interaction have been determined and discussed. |
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