Metal Ion-Coupled Electron Transfer of a Nonheme Oxoiron(IV) Complex: Remarkable Enhancement of Electron-Transfer Rates by Sc~(3+)

摘要

Rates of electron transfer from a series of one-electron reductants to a nonheme oxoiron(IV) complex, [(N4Py)Fe~(Ⅳ)(O)]~(2+), are enhanced as much as 10~8-fold by addition of metal ions such as Sc~(3+), Zn~(2+), Mg~(2+), and Ca~(2+); the metal ion effect follows the Lewis acidity of metal ions. The one-electron reduction potential of [(N4Py)Fe~(Ⅳ)(O)]~(2+) is shifted to a positive direction by 0.84 V in the presence of Sc~(3+) ion (0.20 M).