Donor acceptor Gibbs free energy

The Gibbs free energy yield of carbon oxidation with S04 as a terminal electron acceptor is about 4-10 times lower than with oxygen. However, sulfide, the product of S04 reduction is an excellent electron donor the reaction of which with oxygen ... 

The Gibbs free energy ofphotoinduced electron transfer, AetG°, in an excited encounter complex (D -A) can be estimated from Equation 5.1, where Zs°(D + /D) is the standard electrode potential of the donor radical cation, E° A/A ) that of the acceptor A and A/i0 o is the 0 0 excitation energy of the excited molecule (D or A ) that participates in the reaction. 

Tables Selected binding constants (Ks) and corresponding Gibbs free energy changes (- AG°) of the complexation between different ligand donors and hgand acceptors at 298 K...

The rate constant (kst) of the electron transfer reaction from an electron donor (D) and an electron acceptor (A) is related to the electron coupling matrix element between D and A, ( V ), standard Gibbs free energy change of the electron transfer step (AG°), and the sum of molecular and solvent reorganization energies (1) by [40]... 

The enthalpy term in this equation can be replaced by the free energy if the entropy term in the Gibbs-Helmholtz equation is assumed to be negligible. In the experience of the authors this is generally a reasonable assumption. If the acceptor and donor number for the probe molecules are known then Ka and Kb, the acid and base number of the surface can be computed. 

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