Collect. Czech. Chem. Commun. 1992, 57, 1262-1268

Ten-Vertex Monocarbaborane Chemistry. A Convenient New Preparation of the [closo-1-CB9H10]- Anion and the Crystal and Molecular Structure of [(η5-C5Me5)2Ir2Cl3]+ [closo-1-CB9H10]-

Karl Nestora, Bohumil Štíbrb, John D. Kennedya, Mark Thornton-Petta and Tomáš Jelínekb

a School of Chemistry of the University of Leeds, Leeds LS2 9JT, England
b Institute of Inorganic Chemistry, Czechoslovak Academy of Sciences, 25068 Řež near Prague, Czechoslovakia


A more convenient synthesis of the [closo-1-CB9H10]- anion, from the reaction of 6-(NMe3)-nido-6-CB9H11] with piperidine in THF, is reported. Reaction of [NMe4]+[1-CB9H10]- and [(η5-C5Me5)IrCl2]2 gives the ionic species [(η5-C5Me5)2Ir2Cl3]+ [closo-1-CB9H10]- as a yellow crystalline compound. Crystals are orthorhombic, space group Pnma, with a = 2505.9(6), b = 1223.6(3), c = 1029.8(3) ppm, and Z = 4. The structure was refined for 2329 reflections F > 4.0σ(F) to R = 0.0439. Both cation and anion possess crystallographic mirror-plane symmetry. Comparison of the structure of the anion with other formally closo ten-vertex structures reveals a previously unrecognised general opening.