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Bulletin of the Korean Chemical Society (BKCS)

ISSN 0253-2964(Print)
ISSN 1229-5949(Online)
Volume 10, Number 5
BKCSDE 10(5)
May 20, 1989

Title	Proton Transfer Equilibria in The Excited State of Piroxicam and Its Analog in Aqueous Solution
Author	Minjoong Yoon*, Yong Hee Kim
Keywords
Abstract	The pH dependence of the absorption and fluorescence of 4-hydroxy-2-methyl-1,2-benzothiazinenecarboxylat es, piroxicam and HMBDC have been measured and compared with the solvent dependence of the spectra reported previously. Four different prototropic species are observed in both ground and excited states of piroxicam ; the cation, the neutral, the anion and the dianion, while three different species such as the cation, the neutral and the anion are observed in HMBDC. The pKa and pKa* have been determined by absorptiometric titration and Forster cycle method, respectively. The probable structure of each species has been proposed on the basis of the intramolecular phototautomerism.
Page	434 - 437
Full Text	PDF

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