Synthesis of the Prototypical Cyclic Metallocene Triad: Mixed‐Valence Properties of [(FeCp)₃(trindenyl)] Isomers

Abstract

The “fusion” of three ferrocenes into a rigid cyclic array produces the syn,syn,anti and syn,syn,syn isomers of [(FeCp)3(trindenyl)] (see picture), the cations of which display different mixed-valence properties, namely multiple intervalence-transfer (IT) absorptions appear in the near-IR/IR spectra for the syn,syn,anti isomer, while a single band appears in the visible/near-IR spectrum for the syn,syn,syn isomer.