Abstract
The formation of a 1:1 molecular complex of thiosalicylic acid (TSA) with ethanol was studied spectrophotometrically. Ethanol is postulated to form an intermolecular hydrogen bond with the carboxyl OH group of TSA, the intramolecular hydrogen bond of the SH group remaining intact. Results of SCF-CI molecular orbital calculations support the spectral interpretation. The formation constant ( K ⨍), free energy change (Δ G) and molar absorptivity of the TSA-ethanol molecular complex with cyclohexane, CCl 4 or CHCl 3 as solvents were determined. K ⨍ values vary with solvent in the order cyclohexane > CCl 4 > CHCl 3. The electronic absorption spectra of TSA in one- and two-component solvents are discussed.
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