Exploration of density functional methods for one-electron reduction potential of nitrobenzenes.

Performance of the set of density functional approaches for calculation of one-electron reduction potentials of nitroaromatic compounds was investigated. To select the most precise and affordable method, we selected a set of model molecules and investigated effects of basis set, density functional, and solvation model on the calculation of reduction potentials. It was found that the mPWB1K/TZVP method provides the most accurate gas phase electron affinity values (RMS error is 0.1 eV). This method in conjunction with the PCM (Bondi) method yields also the most accurate difference in solvation energies of neutral oxidized form and anion-radical reduced form. The final E0 values were calculated with RMS error of 0.10 V, compared with experimental values. Copyright 2009 Wiley Periodicals, Inc.