Abstract
Charge transfer complex (CTC) of some thiophene Schiff-base donor and Benzaldehyde, Salicylaldehyde and 2,4-dinitrophenol acceptors has been studied in ethanol, dichloromethane, carbon tetrachloride and acetonitrile solvents at four different temperatures (20, 30, 40, 50 degrees C) using absorption spectrophotometer. The results indicate that formation of CTC in non polar solvent is high. The stoichiometry of the complex was found to be 1; 1 ratio by straight-line method between donor and acceptor with maximum absorption bands. The data are discussed in terms of formation constant (K-CT), molar extinction coefficient (epsilon ECT), standard free energy(Delta G(0)), oscillator strength (f), transition energy (E-CT), and ionization potential (ID). The formation constant (K-CT) for the complex was shown to be dependent upon the nature of electron acceptor, donor and polarity of solvents that were used. The CT complex was synthesized and characterized by elemental analysis, and electronic absorption spectra which indicate the CT interaction associated with proton migration from the acceptor to the donor followed by hydrogen bonding via N+-HO-.