Journal of Pharmaceutical Analysis (Apr 2014)

Charge-transfer interaction of drug quinidine with quinol, picric acid and DDQ: Spectroscopic characterization and biological activity studies towards understanding the drug–receptor mechanism

  • Hala H. Eldaroti,
  • Suad A. Gadir,
  • Moamen S. Refat,
  • Abdel Majid A. Adam

DOI
https://doi.org/10.1016/j.jpha.2013.06.003
Journal volume & issue
Vol. 4, no. 2
pp. 81 – 95

Abstract

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Investigation of charge-transfer (CT) complexes of drugs has been recognized as an important phenomenon in understanding of the drug–receptor binding mechanism. Structural, thermal, morphological and biological behavior of CT complexes formed between drug quinidine (Qui) as a donor and quinol (QL), picric acid (PA) or dichlorodicyanobenzoquinone (DDQ) as acceptors were reported. The newly synthesized CT complexes have been spectroscopically characterized via elemental analysis; infrared (IR), Raman, 1H NMR and electronic absorption spectroscopy; powder X-ray diffraction (PXRD); thermogravimetric (TG) analysis and scanning electron microscopy (SEM). It was found that the obtained complexes are nanoscale, semi-crystalline particles, thermally stable and spontaneous. The molecular composition of the obtained complexes was determined using spectrophotometric titration method and was found to be 1:1 ratios (donor:acceptor). Finally, the biological activities of the obtained CT complexes were tested for their antibacterial activities. The results obtained herein are satisfactory for estimation of drug Qui in the pharmaceutical form. Keywords: Quinidine, Charge-transfer interaction, Powder X-ray diffraction, Morphology, Thermal analysis