REVERSIBLE, THERMALLY-ASSISTED SOLID-STATE REDOX PROCESSES IN MIXED-VALENCE DIMERS

Novel, reversible thermally-assisted solid-state redox behavior has been observed for symmetric fused hydrocarbon bridged binuclear mixed valence compounds containing low-spin Fe-II and Fe-III. On cooling from ambient temperature to similar to 4.2 K, the iron environments change from a mixture of ferricenium and ferrocene to primarily ferrocene-like. These data, in conjunction with ESR and susceptibility measurements, suggest an intermolecular electron transfer and an ionic to neutral transition for the dimers.