A Mixed-Valence Fluorido-Bridged FeIIFeIII Complex
2017
The reaction of the new dinucleating ligand susan6-Me with Fe(BF4)2·6H2O results in formation of the homovalent FeIIFeII complex [(susan6-Me){FeII(μ-F)2FeII}]2+ and the mixed-valence FeIIFeIII complex [(susan6-Me){FeIIF(μ-F)FeIIIF}]2+ depending on the absence or presence of dioxygen, respectively. Complex [(susan6-Me){FeIIF(μ-F)FeIIIF}]2+ is the first molecular mixed-valence complex with a fluorido bridge. The short FeIII–μ-F bond of 1.87 A causes a large reorganization energy, resulting in a localized class II system with an intervalence charge-transfer band of high energy at 10000 cm–1.
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