Terpenylic Acid and Related Compounds from the Oxidation of α-Pinene: Implications for New Particle Formation and Growth above Forests

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• 作者：Magda Claeys ; Yoshiteru Iinuma ; Rafal Szmigielski ; Jason D. Surratt ; Frank Blockhuys ; Christian Van Alsenoy ; Olaf Bge ; Berko Sierau ; Yadian Gmez-Gonzlez ; Reinhilde Vermeylen ; Pieter Van der Veken ; Mon
• 刊名：Environmental Science & Technology
• 出版年：2009
• 出版时间：September 15, 2009
• 年：2009
• 卷：43
• 期：18
• 页码：6976-6982
• 全文大小：232K
• 年卷期：v.43,no.18(September 15, 2009)
• ISSN：1520-5851

文摘

Novel secondary organic aerosol (SOA) products from the monoterpene α-pinene with unique dimer-forming properties have been identified as lactone-containing terpenoic acids, i.e., terpenylic and 2-hydroxyterpenylic acid, and diaterpenylic acid acetate. The structural characterizations were based on the synthesis of reference compounds and detailed interpretation of mass spectral data. Terpenylic acid and diaterpenylic acid acetate are early oxidation products generated upon both photooxidation and ozonolysis, while 2-hydroxyterpenylic acid is an abundant SOA tracer in ambient fine aerosol that can be explained by further oxidation of terpenylic acid. Quantum chemical calculations support that noncovalent dimer formation involving double hydrogen bonding interactions between carboxyl groups of the monomers is energetically favorable. The molecular properties allow us to explain initial particle formation in laboratory chamber experiments and are suggested to play a role in new particle formation and growth above forests, a natural phenomenon that has fascinated scientists for more than a century.