Synthesis and X-ray crystal structure of [Fe2(µ-CH3)(µ-CO)(µ-Ph2PCH2PPh2)(η-C5H5)2][PF6]: a salt with a bridging methyl group having a C---H---Fe interaction

Abstract

Reaction of [Fe₂(µ-CH₂)(µ-CO)(CO)₂(η-C₅H₅)₂] with dppm (dppm = ph₂PCH₂PPh₂) affords [Fe₂(µ-CH₂)(µ-CO)(µ-dppm)(η-C₅H₅)₂] which with HPF₆ yields [Fe₂(µ-CH₃)(µ-CO)(µ-dppm)(µ-C₅H₅)₂][PF₆]a salt in which the CH₃ group is attached to one iron atom via a C-Fe σ bond with an η² C–H interaction with the other as revealed by n.m.r. and single-crystal X-ray diffraction studies.