Abstract
Flash photolysis of 2-hydroxyphenazine in aprotic and protic solvents gives the corresponding unstable ketonic form which reverts to the parent molecule in the dark. The activation energy and the frequency factor of the dark reaction were determined to be 6.1 ± 0.2 kcal mol −1 and 10 8 s −1 respectively. The rather small value of the frequency factor may be attributed to the weakness of the NH bond of the ketonic form. For 1-hydroxyphenazine, no transient is observed. It is suggested that a rapid deactivation of S 1 is induced by intramolecular hydrogen bond formation between the hydroxyl group and the nitrogen atom.
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Schedule a callMore From: Journal of Photochemistry & Photobiology, A: Chemistry
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