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Ozonolysis of a series of C7–C9 unsaturated biogenic aldehydes: reactivity study at atmospheric pressure

机译:一系列C7-C9不饱和生物醛的臭氧溶解:大气压下的反应性研究

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Rate coefficients for the reactions of O _(3) with trans -2-heptenal, trans -2-octenal and trans -2-nonenal have been determined at 298 K and (990 ± 10) mbar in an environmental chamber with in situ FTIR spectroscopy. The following rate coefficients in units of k _(O _(3) ) × 10 ~(18) (cm ~(3) molecule ~(?1) s ~(?1) ) were obtained: (2.47 ± 0.73) for trans -2-heptenal, (2.37 ± 0.68) for trans -2-octenal and (2.05 ± 0.20) for trans -2-nonenal. It is shown that rate coefficients for the addition of O _(3) molecules and OH radicals to the double bond of alkenes and unsaturated and oxygenated volatile organic compounds (OVOCs) at 298 K are related to a good approximation by the expression: log? k _(OH) = 0.16?log? k _(O _(3) ) ? 7.55. Furthermore, a correlation between the reactivity of unsaturated VOCs toward O _(3) molecules and the energies of the Highest Occupied Molecular Orbit (HOMO) of the unsaturated VOCs is presented and potential atmospheric implications of the results are discussed.
机译:用反式-2-庚烷的O _(3)反应的速率系数,Trans -2-octenaL和Trans -2 NonenAl已经在环境室中的298k和(990±10)曼特,以原位FTIR确定光谱学。获得以下速率系数K _(O _(3))×10〜(18)(cm〜(3)分子〜(α1)s〜(α1)):(2.47±0.73) Trans -2-oregenal的Trans -2-eptenal,(2.37±0.68),(2.05±0.20),用于Trans -2-nonenal。结果表明,在298k下加入O _(3)分子和OH基团的速率系数与烯烃和不饱和和含氧有机化合物(OVOC)的双键进行的良好近似:LOG? k_(哦)= 0.16?日志? k _(o_(3))? 7.55。此外,展示了不饱和VOCS对O _(3)分子的反应性与不饱和VOCS的最高占用分子轨道(HOMO)的能量之间的相关性,并讨论了结果的潜在大气意义。

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