Study of the Atmospheric Chemistry of 2-Formylcinnamaldehyde

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• 作者：Sara M. Aschmann ; Janet Arey ; Roger Atkinson
• 刊名：The Journal of Physical Chemistry A
• 出版年：2013
• 出版时间：August 22, 2013
• 年：2013
• 卷：117
• 期：33
• 页码：7876-7886
• 全文大小：448K
• 年卷期：v.117,no.33(August 22, 2013)
• ISSN：1520-5215

文摘

2-Formylcinnamaldehyde is a significant product of the reaction of naphthalene with OH radicals, and its photolysis and gas-phase reactions with O₃, NO₃ radicals, and OH radicals have been investigated in this work. 2-Formylcinnamaldehyde was observed to undergo photolysis by black lamps, with a photolysis rate of 0.14 脳 J(NO₂), where J(NO₂) is the NO₂ photolysis rate. The measured rate constants for the reactions of 2-formylcinnamaldehyde with O₃, NO₃ radicals, and OH radicals (in units of cm³ molecule^鈥? s^鈥?) were 1.8 脳 10^鈥?8, 4.3 脳 10^鈥?4, and 2.1 脳 10^鈥?1, respectively, with those for the O₃ and NO₃ reactions being for the E-isomer. 2-Formylcinnamaldehyde was observed to undergo significant adsorption and desorption from the reaction chamber Teflon film walls, and the photolysis rate and rate constants are subject to significant uncertainties. In the atmosphere, the dominant chemical loss processes for 2-formylcinnamaldehyde will be photolysis during daylight hours and reaction with NO₃ radicals during nighttime. Phthaldialdehyde and glyoxal were observed as products of the OH radical and O₃ reactions, and photolysis of E-2-formylcinnamaldehyde led to formation of Z-2-formylcinnamaldehyde plus two other molecular weight 160 isomers. The present results are compared with previous literature data, and reaction mechanisms are discussed.