Binuclear Di-μ-hydroxo- and diμ-methoxo-pentamethylcyclopentadienyl derivatives of rhodium and iridium with pyridine type ligands. Crystal structure of [(C5Me5)Rh(py)2(μ-OH)2][CIO4]2 (py = pyridine)

The reaction of [(C5Me5)M2(μ-OH)3]+ cations (M = Rh, Ir) with aqueous perchloric or tetrafluoroboric acids and pyridine type ligands (L) yields the binuclear cationic complexes [(C5Me5ML2(μ-OH)2]2+, when acetone is used as solvent, but the di-μ-methoxo complexes, [(C5Me5M(py)2(μ-OMe)2]2+, in methanol. The structure of the diμ-hydroxorhodium complex was determined by X-ray crystallography and has an internal symmetry centre and an intermetallic separation of 3.308(1)Å.We thank CAICYT and Diputacion General de Aragon for financial support.Peer reviewe