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PRIMARY PROCESSES IN THE PHOTOCHEMISTRY OF AQUEOUS SULPHACETAMIDE: A LASER FLASH PHOTOLYSIS and PULSE RADIOLYSIS STUDY
Author(s) -
Land Edward J.,
Navaratnam Suppiah,
Parsons Barry J.,
Phillips Glyn O.
Publication year - 1982
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.1751-1097.1982.tb02622.x
Subject(s) - radiolysis , flash photolysis , solvated electron , photochemistry , chemistry , aqueous solution , reaction rate constant , radical ion , excited state , photodissociation , ultrafast laser spectroscopy , molar absorptivity , ionization , triplet state , ion , laser , kinetics , molecule , atomic physics , organic chemistry , physics , quantum mechanics , optics
— The spectra have been measured of the transient species formed in the nanosecond flash photolysis of aqueous solutions of sulphacetamide under a variety of conditions. In addition to the excited triplet state, the cation radical and the solvated electron were observed. The ionisation of aqueous sulphacetamide was found to occur by a biphotonic process. The extinction coefficient of the cation radical of sulphacetamide was determined by both laser flash photolysis and pulse radiolysis techniques, a value of 1.9 times 10 3 dm 3 mol ‐1 cm ‐1 being obtained. The rate of electron reaction with sulphacetamide and the anion radical spectrum were also determined by the two techniques, good agreement being obtained. The spectrum of the product of the reaction of the superoxide anion radical and the corresponding rate constant have also been determined. A possible mechanism of photosensitized skin reaction due to sulphacetamide is discussed.