Abstract
Molecular charge transfer (CT) complex of donor, 5,6-dimethylbenzimidazole with acceptor, chloranilic acid was synthesized in methanol. Spectrophotometric study was performed in different solvents at different temperatures within the range of 25–45°C. 1:1 stoichiometry was determined by Benesi-Hildebrand plots. Various important thermodynamic parameters such as formation constant (KCT), molar extinction coefficient (εCT), energy of interaction (ECT), ionization potential (ID), resonance energy (RN), free energy (∆G), resonance energy (RN) oscillator strength (f), transition dipole moment (μN), enthalpy (∆H) and entropy (∆S) were determined using UV–visible spectrophotometry in different solvents at different temperatures and temperature dependency of thermodynamic parameters were also studied. FTIR, 1H NMR and ESI-MS spectroscopic techniques were used to ascertain the structure of new CT complex. The thermo gravimetric analysis (TGA) and differential thermal analysis (DTA) determined the stability of CT complex with temperature. CT complex was formed by proton transfer from chloranilic acid to 5,6-dimethylbenzimidazole showing O–HN+ bonding.
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