Abstract
The DFT-B3LYP and G3X model chemistry were used to predict the cation structures and energetics of fluorinated, chlorinated, and brominated methanes. Ion–complex structures between methylene cations and HX (X = F, Cl, Br) were found for all H-containing cations, and [CHF–FH]+, [CF2–FH]+, [CCl2–ClH]+, and [CCl2–FH]+ structures are more stable than their normal tetravalent structures. Several cations should also be better described as ion–complex structures between methyl cations and halogen atoms, e.g., [CF3–Br]+. Transition states connecting normal and ion–complex structures were also located, and potential energy diagrams were constructed for decomposition of methane cations and to predict the fragmentation pathways. The G3X energies were used to predict the adiabatic ionization energies (IEas) and ion fragment appearance energies (AEs) from methanes. Many of the experimental AEs correspond to the energies of transition states instead of the thermodynamic dissociation limits.
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We thank for the service of high performance grid computing platform SCUTGrid provided by Information Network Research and Engineering Center of South China University of Technology and financial support from NSFC (No. 20777017). LW also would like to thank an anonymous reviewer for constructive suggestions.
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The B3LYP/6-31G(2df,p) harmonic vibrational frequencies and ZPE corrections, G3X electronic energies, geometrical parameters of neutral methanes, and geometries of halogenated methylidyne, methylene, and methyl radicals and cations.
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He, YL., Wang, L. Cations of halogenated methanes: adiabatic ionization energies, potential energy surfaces, and ion fragment appearance energies. Struct Chem 20, 461–479 (2009). https://doi.org/10.1007/s11224-009-9444-x
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DOI: https://doi.org/10.1007/s11224-009-9444-x