Optical electron transfer through 2,7-diethynylfluorene spacers in mixed-valent complexes containing electron-rich “(η2-dppe)(η5-C5Me5)Fe” endgroups†
Abstract
We report in this communication the study of the intramolecular electron transfer through a 2,7-diethynylfluorenyl spacer in the Fe(II)/Fe(III) mixed-valent (MV) complex [(η2-dppe)(η5-C5Me5)FeCC(2,7-C21H24)CCFe(η5-C5Me5)(η2-dppe)][PF6] (1[PF6]). The complex is generated in situ by comproportionation from its homovalent dinuclear Fe(II) and Fe(III) parents (1 and 1[PF6]2). It is shown that electronic delocalization is much more effective through a 2,7-fluorenyl than through a 4,4′-biphenyl bridging unit.