The novel mixed-valence, exchange-coupled, class III dimer [L2Fe2(µ-OH)3]2+(L =N,N′,N″-trimethyl-1,4,7-triazacyclononane)

Abstract

The reaction of Fe(CIO₄)₂·6H₂O with N,N′,N,″-trimethyl-1,4,7-triazacyclononane (L) in methanol affords, in the presence of a small amount of oxygen, the deep blue binuclear complex [L₂Fe₂(µ-OH)₃](CIO₄)₂·2MeOH·2H₂O which was characterized by EXAFS, e.s.r., u.v.-visible and Mössbauer spectroscopy to be a mixed valence iron (II/III) species of class III with an S_tot= 9/2 ground state.