Synthesis of a novel macrocyclic dinuclear iron(III) complex and its electrochemical behaviour on an ultramicrodisc platinum electrode

Abstract

A new macrocyclic dinuclear iron(III) complex, prepared by condensing 2,6-diformylpyridine N-oxide with 1,3-diaminopropane in the presence of FeCl2·4H2O, and formulated as Fe2LCl6C2H5OH·6H2O, was characterized by its elemental analyses, by i.r., Mo¨ssbauer and e.p.r. spectra, and was investigated electrochemically. The results show that two iron ions are situated in the same chemical environment in the compound and that the electrode reaction can be considered as a double electron-transfer process. The diffusion coefficient is 2.16×10−6 cm2 s−1 and E°′ −0.169 V (versus s.c.e.) and α = 0.37. The average electron transfer rate constant ko′ is 2.8×10−3 cm s−1.