Abstract
Charge-transfer complexes formed between norfloxacin (nor) or ciprofloxacin (cip) drugs as donors with picric acid (PA) and/or 3,5-dinitrobenzoic acid (DNB) as π-acceptors have been studied spectrophotometrically in methanol solvent at room temperature. The results indicated the formation of CT-complexes with molar ratio1:1 between donor and acceptor at maximum CT-bands. In the terms of formation constant ( K CT), molar extinction coefficient ( ε CT), standard free energy (Δ G o), oscillator strength ( f), transition dipole moment (μ), resonance energy ( R N) and ionization potential ( I D) were estimated. IR, H NMR, UV–Vis techniques, elemental analyses (CHN) and TG–DTG investigations were used to characterize the structural of charge-transfer complexes. It indicates that the CT interaction was associated with a proton migration from each acceptor to nor or cip donors which followed by appearing intermolecular hydrogen bond. In addition, X-ray investigation was carried out to scrutinize the crystal structure of the resulted CT-complexes.
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