The optimized geometries, harmonic vibrational frequencies, and adiabatic electron a nities of eight ring compounds: o-benzyne, cyclohexanone enolate, cyclopentadienyl radical, cyclopentanone enolate, maleic anhydride, phenoxyl radical, phenyl radical, and pyrrolyl radical have been determined with six di erent density functional or hybrid Hartree± Fock density functional methods using a double-zeta basis set with polarization and di use functions (DZP+ + ). The optimized geometric structures are discussed. Harmonic vibrational frequencies were generally found to be within 4% of available experimental fundamentals for most functionals. Of the six functionals, BP86 predicted electron a nities remarkably close to the experimental values for six of the eight molecules studied, with an overall average absolute error with respect to experiment of just 0.12 eV. The B3LYP and BLYP functionals also gave excellent predictions, with absolute average errors of 0.18 and 0.20 eV, respectively.
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