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Photooxidation of n-Hexanal in Air
Center for Chemistry IChTM, POB 815, Studentski trg 12-16, 11001 Belgrade, Yugoslavia
Faculty of Chemistry, University of Belgrade, POB 158, 11001 Belgrade, Yugoslavia
Max-Planck-Institut für Chemie, Atmospheric Chemistry Department, Postfach 3060, 55020 Mainz, Germany
* Author to whom correspondence should be addressed.
Received: 21 November 2000; in revised form: 11 December 2000 / Accepted: 12 December 2000 / Published: 31 March 2001
Abstract: Dilute mixtures of hexanal in synthetic air (up to 100 ppm) were photolyzed with fluorescent UV lamps (275-380 nm) in air at 298 K. The main photooxidation products, identified and quantitatively analyzed by FTIR spectroscopy, were butene, CO, vinylalcohol and ethanal. The photolysis rates and the absolute quantum yield Φ were found to be slightly dependent on the total pressure. At 100 Torr, Φ100 = 0.43 ± 0.02, whereas at 700 Torr the total quantum yield was Φ700 = 0.38 ± 0.02. These results may be explained by the collisional deactivations of photoexcited molecules. Two decomposition channels were identified: the radical channel C5H11CHO → C5H11 + HCO, and the molecular channel C5H11CHO → C4H8 + CH2=CHOH, having the relative yields of 27 and 73 % at 700 Torr. The product CH2=CHOH tautomerizes to ethanal.
Keywords: Photolysis; photooxidation; aldehydes
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Tadić, J.; Juranić, I.; Moortgat, G.K. Photooxidation of n-Hexanal in Air. Molecules 2001, 6, 287-299.
Tadić J, Juranić I, Moortgat GK. Photooxidation of n-Hexanal in Air. Molecules. 2001; 6(4):287-299.
Tadić, Jovan; Juranić, Ivan; Moortgat, Geert K. 2001. "Photooxidation of n-Hexanal in Air." Molecules 6, no. 4: 287-299.