Journal
SPECTROCHIMICA ACTA PART A-MOLECULAR AND BIOMOLECULAR SPECTROSCOPY
Volume 92, Issue -, Pages 46-55Publisher
PERGAMON-ELSEVIER SCIENCE LTD
DOI: 10.1016/j.saa.2012.02.026
Keywords
Charge transfer; Trimethoprim; Albendazole; DDQ; Fluorescence; Solvent effect
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Funding
- Council of Scientific and Industrial Research (CSIR), New Delhi [01/2221/08]
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UV-vis, H-1 NMR, FT-IR, mass and fluorescence spectral techniques were employed to investigate the mechanism of interaction of albendazole and trimethoprim with 2,3-dichloro-5,6-dicyano-1,4-benzoquinone (DDQ) and to characterize the reaction products.The interaction of DDQ with trimethoprim (TMP) and albenadazole (ALB) were found to proceed through the formation of donor-acceptor complex, containing DDQ radical anion and its conversion to the product. Fluorescence quenching studies indicated that the interaction between the donors and the acceptor are spontaneous and the interaction of TMP-DDQ (binding constant = 2.9 x 10(5)) is found to be stronger than that the ALB-DDQ (binding constant = 3 x 10(3)) system. Also, the binding constant increased with an increase in polarity of the medium indicating the involvement of radical anion as intermediate. (C) 2012 Elsevier B.V. All rights reserved.
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