329686-13-7Relevant academic research and scientific papers
Synthesis and electrochemical studies of diiron complexes of 1,8-naphthyridine-based dinucleating ligands to model features of the active sites of non-heme diiron enzymes
He,Lippard
, p. 1414 - 1420 (2001)
A bis(μ-carboxylato)(μ-1,8-naphthyridine)diiron(II) complex, [Fe2(BPMAN)(μ-O2CPhCy)2](OTf)2 (1), was prepared by using the 1,8-naphthyridine-based dinucleating ligand BPMAN, where BPMAN = 2,7-bis[bis(2-pyridylmethyl)-aminomethyl]-1,8-naphthyridine. The cyclic voltammogram (CV) of this complex in CH2Cl2 exhibited two reversible one-electron redox waves at +296 mV (ΔEp = 80 mV) and +781 mV (ΔEp = 74 mV) vs Cp2Fe+/Cp2Fe, corresponding to the FeIIIFeII/FeIIFeII and FeIIIFeIII/FeIIIFeII couples, respectively. This result is unprecedented for diiron complexes having no single atom bridge. Dinuclear complexes [Fe2(BPMAN)(μ-OH)(μ-O2CPhCy)]-(OTf)2 (2) and [Mn2(BPMAN)(μ-O2CPhCy)2](OTf)2 (3) were also synthesized and structurally characterized. The cyclic voltammogram of 2 in CH2Cl2 exhibited one reversible redox wave at -22 mV only when the potential was kept below +400 mV. The CV of 3 showed irreversible oxidation at potentials above +900 mV. Diiron(II) complexes Fe2(BEAN)(μ-O2CPhCY)3](OTf) (4) and [Fe2(BBBAN)(μ-OAC)2(OTf)](OTf) (6) were also prepared and characterized, where BEAN = 2,7-bis(N,N-diethylaminomethyl)-1,8-naphthyridine and BBBAN = 2,7-bis-{2-[2-(1-methyl)benzimidazolylethyl]- N-benzylaminomethyl}-1,8-naphthyridine. The cyclic voltammograms of these complexes were recorded. The Moessbauer properties of the diiron compounds were studied.
