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PHOTOCHEMICAL and PHOTOPHYSICAL PROPERTIES OF PIROXICAM and BENOXAPROFEN IN VARIOUS SOLVENTS
Author(s) -
Becker Ralph S.,
Chakravorti Sankar,
Yoon Minjoong
Publication year - 1990
Publication title -
photochemistry and photobiology
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 0.818
H-Index - 131
eISSN - 1751-1097
pISSN - 0031-8655
DOI - 10.1111/j.1751-1097.1990.tb01696.x
Subject(s) - quantum yield , solvent , photochemistry , toluene , chemistry , hydrogen bond , yield (engineering) , piroxicam , fluorescence , spectroscopy , ultrafast laser spectroscopy , flash photolysis , triplet state , molecule , materials science , organic chemistry , kinetics , pathology , quantum mechanics , metallurgy , medicine , physics , alternative medicine , reaction rate constant
— Laser flash spectroscopy was used to examine the title compounds. Piroxicam has a triplet transient with a maximum near 450 and a lifetime of 3–21 μs depending on the solvent. The relative quantum yield is highly solvent dependent being maximum in toluene and 14 fold lower in hydrogen bonding solvents. There is another transient which is assigned as a proton transferred ground state transient. Some permanent photoproduct also appears to be produced. Benoxaprofen also has a triplet transient with a maximum near 420 nm with a lifetime of 65 μs to 250 μs depending on the solvent. In this case, the relative quantum yield only slightly varies among polar and hydrogen bonding solvents. This is in marked contrast to published data on the fluorescence yield. Some permanent photoproduct appears to be produced.