Reversible (De)protonation-Induced Valence Inversion in Mixed-Valent Diiron(II,III) Complexes
摘要:
The coupling of electron and proton transfers is currently under intense scrutiny. This Communication reports a new kind of proton-coupled electron transfer within a homodinuclear first-row transition-metal complex. The triply-bridged complex [Fe(III)(mu-OPh)(mu(2)-mpdp)Fe(II)(NH(2)Bn)] (1; mpdp(2-) = m-phenylenedipropionate) bearing a terminal aminobenzyl ligand can be reversibly deprotonated to the animate complex 2 whose core [Fe(II)(mu-OPh)(mu(2)-mpdp)Fe(III)(NHBn)] features an inversion of the iron valences. This observation is supported by a combination of UV-visible, (1)H NMR, and Mossbauer spectroscopic studies.