Expanding and Testing a Computational Method for Predicting the Ground State Reduction Potentials of Organic Molecules on the Basis of Empirical Correlation to Experiment

A method for predicting the ground state reduction potentials
of
organic molecules on the basis of the correlation of computed energy
differences between the starting S0 and one-electron-reduced
D0 species with experimental reduction potentials in acetonitrile
has been expanded to cover 3.5 V of potential range and 74 compounds
across 6 broad families of molecules. Utilizing the conductor-like
polarizable continuum model of implicit solvent allows a global correlation
that is computationally efficient and has improved accuracy, with r2 > 0.98 in all cases and root mean square
deviation
errors of <90 mV (mean absolute deviations <70 mV) for either
B3LYP/6-311+G­(d,p) or B3LYP//6-31G­(d) with an appropriate choice of
radii (UAKS or UA0). The correlations are proven to be robust across
a wide range of structures and potentials, including four larger (27–28
heavy atoms) and more conformationally flexible photochromic molecules
not used in calibrating the correlation. The method is also proven
to be robust to a number of minor student “mistakes”
or methodological inconsistencies.