Yx. Bu et al., Ab initio prediction of Mn2+OH2/Mn3+OH2 electron transfer reactivity at electron correlation level, J MOL ST-TH, 530(3), 2000, pp. 327-341
An ab initio calculation of electron transfer reactivity of Mn2+OH2/Mn3+OH2
redox system, in gas and in solution, has been made in this paper. The det
ailed geometry optimization and the scanning of the potential energy surfac
es have been carried out at UMP2 (full)/6-311 + G* level. The relevant ener
gy quantities (such as the activation energy and the binding energy) are ca
lculated at different levels of theory (HF, MP2, MP3, MP4 and QCISD and cor
responding spin-projection PUHF, PMP2 and PMP3) with the same basis set (6-
311 + G*). Both all-electrons and valence electrons have been correlated in
energy calculations. The electronic transmission coefficient is calculated
using the ab initio potential energy surface slopes and the coupling matri
x element determined from the two-state model and the Slater-type d-electro
n wave functions. The pair distribution function is obtained using both a c
lassical sphere approximation scheme and a novel scheme. The relevant kinet
ic parameters are obtained at different ab initio levels in terms of the ne
w model. The contact-distance dependence of these parameters and the applic
ability of the presented models are also discussed. (C) 2000 Elsevier Scien
ce B.V. All rights reserved.