Unambiguous identification of esters as oligomers in secondary organic aerosol formed from cyclohexene and cyclohexene/α-pinene ozonolysis
Unambiguous identification of esters as oligomers in secondary organic aerosol formed from cyclohexene and cyclohexene/α-pinene ozonolysis
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DOI：
10.5194/acp-8-1423-2008
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发表时间：
2007-09
影响因子：
6.3
通讯作者：
Ludovic Muller;M. Reinnig;J. Warnke;T. Hoffmann
中科院分区：
文献类型：
--
作者：
Ludovic Muller;M. Reinnig;J. Warnke;T. Hoffmann
二次有机气溶胶（SOA）形成过程中低聚化合物的积累是多年来大气研究的主题。低聚物的形成可能会显著影响新粒子的形成，尤其是SOA的质量产率。然而，所观察到的低聚物的化学性质及其形成途径仍然不清楚。本文报道了臭氧氧化环己烯和环己烯/β-蒎烯混合物时所生成的某些二聚物（酯）的结构特征。鉴别基于低聚产物与合成参比化合物的质谱和保留时间（LC）比较。环己烯在这里用作萜烯的模型化合物，萜烯是全球最重要的SOA前体，因为它具有比生物烯烃更简单的结构，因此提供了获得其某些氧化产物的参考化合物的可能性。除了环己烯之外，在以α-蒎烯为反应物的实验中也可以观察到酯的形成。
The build-up of oligomeric compounds during secondary organic aerosol (SOA) formation is subject of at- mospheric research since several years. New particle forma- tion and especially the SOA mass yield might be influenced significantly by oligomer formation. However, the chemi- cal nature of observed oligomers and their formation path- ways are still unclear. In this paper, the structural charac- terization of certain dimeric compounds (esters) formed dur- ing the ozonolysis of cyclohexene and cyclohexene/ -pinene mixtures are presented. The identification is based on the comparison of the mass spectra and the retention times (LC) of the oligomeric products with synthesized reference com- pounds. Cyclohexene is used here as a model compound for terpenes as globally most important SOA precursors, since it possesses a simpler structure than the biogenic alkenes and therefore offers the possibility to get access to reference com- pounds for certain of its oxidation products. In addition to cyclohexene, the formation of esters could also be observed in experiments with -pinene as reactant.