(Carborane)rhodium-gold complexes

Synthesis of Mixed-Metal (Ru−Rh) Bimetallacarboranes viaexo-nido- andcloso-Ruthenacarboranes. Molecular Structures of (η4-C8H12)Rh(μ-H)Ru(PPh3)2(η5-C2B9H11) and (CO)(PPh3)Rh(μ-H)Ru(PPh3)2(η5-C2B9H11) and Their Anioniccloso-Ruthenacarborane Precursors

“…Since structural characterization of the first two bimetallic rhodacarboranes [(Ph 3 PRhC 2 B 9 H 11 ] 2 1 and [(Et 3 P)RhC 2 B 9 H 10 ] 2 2 demonstrated their unique nature of bonding via exopolyhedral two-electron three-center (2e,3c) B−H···M bonds supporting the Rh−Rh single bond in the dimers, the chemistry of low-nuclearity homo- and heterometallic carborane-containing clusters has been extensively studied . Within this family numerous examples of homo- and mixed-metal bimetallacarboranes of the platinum group with Rh−Rh, − Rh−Ir, Rh−Pt, and other Rh−M fragments 5 , ,− have recently been synthesized and structurally characterized. All these species, however, are formally closo -rhodacarboranes since the dicarbollide ligand is η 5 -coordinated to the rhodium atom while the latter is simultaneously linked to a variety of other transition metals.…”