Iron–rhodium and iron–iridium complexes containing one bridging Ph2PCH2PPh2(dppm) ligand: crystal structure determination of [(η5-C5H5)Fe(µ-CO)2(µ-dppm)RhMe0.4Cl1.6]

Abstract

Treatment of [Fe(η⁵-C₅H₅)(CO)(COMe)(dppm-P)](dppm = Ph₂PCH₂PPh₂) with [Rh₂(CO)₄Cl₂] or [Ir(CO)₂Cl(p-NH₂C₆H₄Me)] gave [(η⁵-C₅H₅)Fe(µ-CO)₂(µ-dppm)M(COMe)Cl](M = Rh or Ir), which decarbonylate slowly in solution to give [(η⁵-C₅H₅)Fe(µ-CO)₂(µ-dppm)M(Me)Cl](M = Rh or Ir). In the latter reduction, when M = Rh, the dichlorohodium complex [(η⁵-C₅H₅)Fe(µ-CO)₂(µ-dppm)RhCl₂] coprecipitated with [(η⁵-C₅H₅)Fe(µ-CO)₂(µ-dppm)Rh(Me)Cl] such that an X-ray crystal structure determination showed mixed Me/Cl occupancy, with the formula being approximately [(η⁵-C₅H₅)Fe(µ-CO)₂(µ-dppm)RhMe_0.4Cl_1.6]. Treatment of [(η⁵-C₅H₅)Fe(µ-CO)₂(µ-dppm)Rh(COMe)Cl] with HBF₄·Et₂O gave [(η⁵-C₅H₅)Fe(µ-CO)₂(µ-dppm)Rh(µ-Cl)₂Rh(µ-CO)₂(µ-dppm)Fe(η⁵-C₅H₅)][BF₄]₂.