Journal article
Probing the reactivity of singlet oxygen with cyclic monoterpenes
ACS Omega, Vol.4(9), pp.14040-14048
2019
Abstract
Monoterpenes represent a class of hydrocarbons consisting of two isoprene units. Like many other terpenes, monoterpenes emerge mainly from vegetation, indicating their significance in both atmospheric chemistry and pharmaceutical and food industries. The atmospheric recycling of monoterpenes constitutes a major source of secondary organic aerosols. Therefore, this contribution focuses on the mechanism and kinetics of atmospheric oxidation of five dominant monoterpenes (i.e., limonene, α-pinene, β-pinene, sabinene, and camphene) by singlet oxygen. The reactions are initiated via the ene-type addition of singlet oxygen (O21Δg) to the electron-rich double bond, progressing favorably through the concerted reaction mechanisms. The physical analyses of the frontier molecular orbitals agree well with the thermodynamic properties of the selected reagents, and the computed reaction rate parameters. The reactivity of monoterpenes with O21Δg follows the order of α-pinene > sabinene > limonene > β-pinene > camphene, i.e., α-pinene and camphene retain the highest and lowest reactivity toward singlet oxygen, with rate expressions of k(T) (M–1 s–1) = 1.13 × 108 exp(−48(kJ)/RT(K)) and 6.93 × 108 exp(−139(kJ)/RT(K)), respectively. The effect of solvent on the primary reaction pathways triggers a slight reduction in energy, ranging between 12 and 34 kJ/mol.
Details
- Title
- Probing the reactivity of singlet oxygen with cyclic monoterpenes
- Authors/Creators
- N. Zeinali (Author/Creator) - Murdoch UniversityI. Oluwoye (Author/Creator) - Murdoch UniversityM.K. Altarawneh (Author/Creator) - United Arab Emirates UniversityM.H. Almatarneh (Author/Creator) - University of JordanB.Z. Dlugogorski (Author/Creator) - Charles Darwin University
- Publication Details
- ACS Omega, Vol.4(9), pp.14040-14048
- Publisher
- American Chemical Society
- Identifiers
- 991005541233807891
- Copyright
- © 2019 American Chemical Society
- Murdoch Affiliation
- Chemistry and Physics
- Language
- English
- Resource Type
- Journal article
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- Citation topics
- 2 Chemistry
- 2.59 Pigments, Sensors & Probes
- 2.59.735 Photodynamic Therapy
- Web Of Science research areas
- Chemistry, Multidisciplinary
- ESI research areas
- Chemistry