Abstract
The analytic energy gradient is developed for open-shell fragment molecular orbital methods (FMO) interfaced with the polarizable continuum model. A pair interaction energy decomposition analysis, spin density and atomic spin populations are also developed. The accuracy is tested on a polypeptide oxidation reaction in solution, comparing three isomers. FMO is applied to study the spin density distribution and radical stabilization of the doublet state of the ribonucleotide reductase in solution, containing 11536 atoms.
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