The isonido‐Metalladicarbaborane [1,1,1‐H{P(CH3)3}2‐6‐Cl‐1,2,4‐IrC2B8H9]

A single-crystal diffraction study of the title iridadicarbaundecaborane species, 6-chloro-1,1-bis(trimethylphosphine-P)-1-endo-H-2,3-dicarba-1-irida-isonido-undecaborane(12), [IrH(PMe3)2(C2B8H9Cl)] or [(PMe3)2(H)IrC2B8H9Cl], shows that it has an isonido-type structure with a four-membered Ir1–C2–C4–B7 open face. The presence of the chlorine substituent on vertex B6 suggests that the compound is formed via a simple ligand elimination and intrafacial addition of the metal vertex to a neighbouring boron vertex in the probable precursor compound nido-[(PMe3)2(CO)IrC2B8H10Cl].