Electron affinities, gas phase acidities, and potential energy curves: Benzene

Abstract

ABSTRACT:The experimental electron affinities of benzene, E a (Bz), 0.4 to Ϫ4.8 eV, are evaluated. Multiple negative ion states are proposed to account for different electron affinities. The semi-empirical procedure known as "configuration interaction or unrestricted orbitals to relate experimental quantities to self-consistent field values by estimating electron correlation" (CURES-EC) has several advantages: (i) supports multiple E a (Bz), (ii) supports the E a (phenyl) and the D(COH,Bz), (iii) supports the gas phase acidity of benzene from the latter, (iv) predicts the singlet-triplet split for the phenyl anion of 1.2(2) eV, and (v) predicts the existence of an excited quartet state of the benzene anion with an E a (Bz), Ϫ2.5(2) eV. Nine ionic Morse curves are calculated from CURES-EC properties and experimental data. These are compared with quantum mechanical crossing "c" potentials obtained using a subroutine in commercial software and ab initio and density functional theory (DFT) procedures. Curves are calculated for the proposed quartet state of the benzene anion.

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THEORETICAL, EMPIRICAL AND EXPERIMENTAL ELECTRON AFFINITIES OF SF6: SOLVING THE DENSITY FUNCTIONAL ENIGMA

“…The k B which includes the additional mass of the electron are determined by other data. [1][2][3][4][5][6][7][8]20 In this work, we will calculate the HIMPEC potentials for SF6 using semiempirical and DFT methods, which has never been reported.…”

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