Spectrophotometric studies of charge transfer complexes of Piroxicam with 2,3-dichloro-5,6-dicyano-1,4-benzoquinon

Farhadi, Khalil and Bani saeid, Sepideh and Afrasiabi, Laya and Soryya Keshtiban, Azam and Norani, Narmin (2008) Spectrophotometric studies of charge transfer complexes of Piroxicam with 2,3-dichloro-5,6-dicyano-1,4-benzoquinon. In: 11th Iranian Physical Chemistry Seminar-July 2008, July 2008, Ardabil, Iran.

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Abstract

Electron donor–acceptor (EDA) or charge transfer complexes (CT) are recently gaining importance as potential high efficiency non-linear optical materials, organic superconductors as well as photocatalysts [1,2]. EDA interaction is also important in the field of drug–receptor binding mechanism, in solar energy storage and in surface chemistry as well as in many biological fields [3,4]. On the other hand, the charge transfer reactions of certain n-acceptors have been successfully utilized in pharmaceutical analysis. For these wide applications, extensive studies on CT complexes of n-acceptors have been performed. The solid complexes were synthesized and studied by chemical analysis (C, H, N), infrared, electronic absorption, H NMR and ESR spectra as well as the magnetic moment and electrical conductivity measurements. It is well known that when the colorless solutions of different donors are mixed with the yellow solution of 2,3-dichloro-5,6-dicyano-1,4-benzoquinon (DDQ) a distinct change in color occurs. The resultant initial color, however, fades with time and is replaced by another color. To the best of our knowledge there is no published report on the complexation of piroxicam (PRXM) with DDQ in acetonitrile (AN) solutions.

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