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The rigorous way to obtain the GSOP (also termed ¦¤Gox) is to compute the free
energy difference between the neutral and the oxidized GS species, (G0 - G+)GS.16 The Gibbs free energy in solution of a species i (Gsolv) is defined as Gsolv=Gvac+ ¦¤Gsolv, where Gvac is the Gibbs free energy in gas phase and ¦¤Gsolv
is the free energy of solvation. Gvac is obtained by performing a singlepoint calculation at the optimized geometry in vacuo, followed by frequency calculations in order to include the vibrational contribution to the total partition function. ¦¤Gsolv
i is obtained by a single-point calculation in solution and a reference calculation in gas phase at the geometry optimized in solution.Geometry optimizations of the neutral and oxidized sensitizers were carried out in gas phase and in acetonitrile, that is the solvent experimentally employed for the electrochemical measures,
by using the B3LYP exchange-correlation functional and a 6-31G* basis set. Solvation effects were taken into account by means of the C-PCM solvation model as implemented in Gaussian 03 (G03). We employ the UAHF radii, expressly
optimized to reproduce the experimental solvation energy of a
series of organic molecules. For the calculation of ¦¤Gox we adopted a 6-31+G* basis set, which includes both diffuse and polarization functions, since
in preliminary calculations we found a sizable effect (+0.2-0.3
eV) of the diffuse functions on the computed ¦¤Gox. We tested
the performance of different GGA, hybrid GGA and meta-hybrid
GGA functionals, also combining different exchange and
correlation parts, in order to elucidate the combined effect on
the computed ¦¤Gox of the local and nonlocal HF exchange as
well as of the correlation functional.
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[ Last edited by linyanglin on 2011-6-10 at 20:11 ]
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