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Enthalpies of formation of the benzyloxyl, benzylperoxyl, hydroxyphenyl radicals and related species on the potential energy surface for the reaction of toluene with the hydroxyl radical

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Abstract

The reaction of toluene (T) with ·OH produces addition products as well as the benzyl radical (TR). TR can react with ·OH or O2 to produce oxygenated species, for many of which there is no experimental information available. We present here theoretically determined heats of formation (HFs) of 17 such species using the non-isodesmic reactions on the potential energy surface of TR + O2 and T + ·OH +O2. For those species the experimental HFs of which are known, we obtained a good correlation between experimental and theoretical values at the G4 (r2 = 0.999) and M06/cc-pVQZ (r2 = 0.997) levels, thus showing the goodness of the methods used. Experimentally unknown HFs of other radicals (benzyloxyl, spiro [1,2-dioxetane benzyl], hydroxyphenyl and benzylperoxyl) and closed-shell species (salicylic alcohol, benzo[b]oxetane and p-hydroxy cyclohexa-2,5-dienone) were later determined using those methods.

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Acknowledgements

PEDECIBA (Uy), CSIC (UdelaR, Uy) and ANII (Uy) are gratefully acknowledged for sustained funding of the theoretical atmospheric chemistry program in which the toluene project is included. Some of the calculations reported in this paper were performed in ClusterUY, a newly installed platform for high-performance scientific computing at the National Supercomputing Center, Uruguay.

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Authors and Affiliations

  1. Computational Chemistry and Biology Group, CCBG – DETEMA, Facultad de Química, UdelaR, CC1157, Isidoro de Maria 1614, 11000, Montevideo, Uruguay

    Oscar N. Ventura & Martina Kieninger

  2. SMART Lab, Scuola Normale Superiore, Piazza dei Cavalieri, 7, 56126, Pisa, Italy

    Zoi Salta & Vincenzo Barone

  3. Physical Chemistry Sector, Department of Chemistry, University of Ioannina, Ioannina, Greece

    Agnie M. Kosmas

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  1. Oscar N. Ventura
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Ventura, O.N., Kieninger, M., Salta, Z. et al. Enthalpies of formation of the benzyloxyl, benzylperoxyl, hydroxyphenyl radicals and related species on the potential energy surface for the reaction of toluene with the hydroxyl radical. Theor Chem Acc 138, 115 (2019). https://doi.org/10.1007/s00214-019-2500-8

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