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• W2077264324 abstract "Abstract Outersphere reorganization energies ( λ ) for intramolecular electron transfer (ET) and hole transfer are studied in anion- and cation-radical forms of complex organic substrates (biphenylyl-spacer-naphtyl) in polar solvents simulated by means of the nonpolarizable models of water and 1,2-dichloroethane. The earlier elaborated molecular/continuum approach (the MD/FRCM, J. Chem. Phys., 119 (2003) 8024) is used; this method provides a physically relevant background for separating inertial and inertialess polarization responses within a nonpolarizable MD simulation (the SPC water model). Quantum-chemical calculations of solute charge distributions were performed with semiempirical (AM1) and second ab initio (HF/6-31G(d,p)) approximations. Ab initio charges give lower λ -values and are preferable, probably, because of including the effect of the SCRF polarization of the diabatic ET states. Standard Lennard–Jones and charge parameters implemented in MD runs were not specially fitted for reproducing ET effects. The difference in values for a cation and an anion originating from the same parent structure was specially investigated. As shown earlier, this effect, nonlinear in its nature, proved to be extremely large when a model dipolar two-site system was studied. For the present ET structures representing real chemical substrates it has reduced to a plausible value of 6–8 kcal/mol. The study of the temperature dependence of λ comprises a first MD simulation of this problem and its slope was found to be in accord with an experimental observation for an anionic species. Calculations of absolute λ -values for the hole transfer in 1,2-dichloroethane are the first MD simulations of reorganization energies in experimentally studied reactions. Computed values of λ -s are higher than the experimental data. The effect of this magnitude could be eliminated by proper tuning the solvent parameters." @default.
• W2077264324 created "2016-06-24" @default.
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• W2077264324 date "2005-12-01" @default.
• W2077264324 modified "2023-10-14" @default.
• W2077264324 title "Molecular simulations of outersphere reorganization energies for intramolecular electron and hole transfer in polar solvents" @default.
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• W2077264324 doi "https://doi.org/10.1016/j.chemphys.2005.03.037" @default.
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