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Spectroscopic and physical measurements on charge-transfer complexes: Interactions between norfloxacin and ciprofloxacin drugs with picric acid and 3,5-dinitrobenzoic acid acceptors
Faculty
Science
Year:
2011
Type of Publication:
Article
Pages:
217-226
Authors:
Refat, Moamen S, Elfalaky, A, Elesh, Eman
DOI:
10.1016/j.molstruc.2011.01.049
Journal:
JOURNAL OF MOLECULAR STRUCTURE ELSEVIER SCIENCE BV
Volume:
990
Research Area:
Chemistry
ISSN
ISI:000288979400030
Keywords :
Norfloxacin, Ciprofloxacin, Charge-transfer complexes, TG/DTG, Picric acid, 3, 5-Dinitrobenzoic zcid
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 pi-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 (epsilon(CT)), standard free energy (Delta G degrees), oscillator strength (f), transition dipole moment (mu), 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. (C) 2011 Elsevier B.V. All rights reserved.
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