title: Development of a model for predicting reaction rate constants of organic chemicals with ozone at different temperatures.
abstract: To assess the persistence and fate of volatile organic compounds in the troposphere, the rate constants for the reaction with ozone (kO3) are needed. As kO3 values are only available for hundreds of compounds, and experimental determination of kO3 is costly and time-consuming, it is of importance to develop predictive models on kO3. In this study, a total of 379 logkO3 values at different temperatures were used to develop and validate a model for the prediction of kO3, based on quantum chemical descriptors, Dragon descriptors and structural fragments. Molecular descriptors were screened by stepwise multiple linear regression, and the model was constructed by partial least-squares regression. The cross validation coefficient QCUM(2) of the model is 0.836, and the external validation coefficient Qext(2) is 0.811, indicating that the model has high robustness and good predictive performance. The most significant descriptor explaining logkO3 is the BELm2 descriptor with connectivity information weighted atomic masses. kO3 increases with increasing BELm2, and decreases with increasing ionization potential. The applicability domain of the proposed model was visualized by the Williams plot. The developed model can be used to predict kO3 at different temperatures for a wide range of organic chemicals, including alkenes, cycloalkenes, haloalkenes, alkynes, oxygen-containing compounds, nitrogen-containing compounds (except primary amines) and aromatic compounds.
authors.affiliation: Key Laboratory of Industrial Ecology and Environmental Engineering (MOE), School of Environmental Science and Technology, Dalian University of Technology, Linggong Road 2, Dalian 116024, China. lixuehua@dlut.edu.cn
authors.forename: Xuehua
authors.initials: X
authors.lastname: Li
authors.forename: Wenxing
authors.initials: W
authors.lastname: Zhao
authors.forename: Jing
authors.initials: J
authors.lastname: Li
authors.forename: Jingqiu
authors.initials: J
authors.lastname: Jiang
authors.forename: Jianji
authors.initials: J
authors.lastname: Chen
authors.forename: Jingwen
authors.initials: J
authors.lastname: Chen
mesh_terms: D000393:Air Pollutants / Q000737:chemistry*; D004784:Environmental Monitoring / Q000379:methods*; D007700:Kinetics; D016018:Least-Squares Analysis; D008962:Models, Theoretical; D009930:Organic Chemicals / Q000737:chemistry*; D010126:Ozone / Q000737:chemistry*; D021281:Quantitative Structure-Activity Relationship; D013696:Temperature
chemical_list: D000393:Air Pollutants; D009930:Organic Chemicals; D010126:Ozone
keywords: Ozone; Partial least-squares (PLSs); Quantitative structure–activity relationship; Reaction rate constant; Temperature dependence