A new combination of donor and acceptor: bis(η6-benzene)chromium and hexafluorobenzene form a charge-transfer stacked crystal

Bis(η6-benzene)chromium reacts with hexafluorobenzene to yield a red charge-transfer complex [Cr(η6-C6H6)2•C6F6] which contains stacks of alternating donor and acceptor molecules with close inter- and intrastack contacts; in addition to the charge-transfer complex, formation of [Cr(η6-C6H6)2]+ is demonstrated by EPR and IR spectroscopy.