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• W2024587715 endingPage "2055" @default.
• W2024587715 startingPage "2045" @default.
• W2024587715 abstract "µ-Oxo-µ-carboxylato-diiron complexes [Fe2O(O2CR)L2]X3(R = Me or Ph, X = ClO4 or NO3) with the tripodal polybenzimidazole tris[(benzimidazol-2-yl)methyl]amine (L1), tris[(N-methylbenzimidazol-2-yl)methyl]amine (L2) and tris[(N-ethylbenzimidazol-2-yl)methyl]amine (L3) have been synthesized and characterized by elemental analysis, IR, electronic, resonance-Raman and 1H NMR spectroscopies and cyclic voltammetry. The crystal structures of [Fe2O(O2CMe)L22][ClO4]3H2O·3MeCN and [Fe2O(O2CPh)L22][ClO4]3·H2O·2MeCN have been determined. They show that the complexes contain two distinct iron sites. At one the benzimidazole nitrogen atom is trans to the oxo-bridge, while at the other the tertiary amine nitrogen atom is trans to the oxo-bridge. That this solid-state structure persists in solution was confirmed by 1H NMR spectroscopy. The asymmetry is manifested in the resonance Raman spectra as an enhancement of νasym(Fe–O–Fe) and a large intensity ratio (Iasym/Isym 0.19–0.26:1) of νasym(Fe–O–Fe) to νasym(Fe–O–Fe). The first complex exhibits strongly antiferromagnetic exchange with a J value of –108.22 cm–1. The Mössbauer spectra of these two complexes and of [Fe2O(O2CMe)L32][ClO4]3·0.5H2O have been recorded. The electrochemical results show that the complexes exhibit completely irreversible redox behaviour which is different from that found in µ-oxo-diiron proteins." @default.
• W2024587715 created "2016-06-24" @default.
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• W2024587715 date "1995-01-01" @default.
• W2024587715 modified "2023-10-16" @default.
• W2024587715 title "Synthesis, crystal structures and physical properties of µ-oxo-µ-carboxylato-diiron(III) complexes with tripodal polybenzimidazole ligands containing distinct iron sites" @default.
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• W2024587715 doi "https://doi.org/10.1039/dt9950002045" @default.
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