CYCLOPENTADIENYL DERIVATIVES OF OCTAHEDRAL CARBONYLCARBIDE HEXARUTHENIUM CLUSTERS - SYNTHESIS, NMR, IR AND X-RAY CHARACTERIZATION

The reaction of hexanuclear carbonylcarbide cluster Ru6C(CO)(17) (1) w ith pentamethylcyclopentadiene by reflux in heptane leads to a new che late cluster Ru6C(mu-eta(1)-eta(5)-CH(2)C(5)Me(4))(CO)(14) (2). The co mpound 2 contains a CH2 group sigma-bonded to one of the Ru atoms in t he Ru-6 cluster and a C(5)Me(4)-ligand eta(5)-coordinated by the adjac ent Ru atom of the Ru-6 cluster, Reflux of 1 in hexane with two molecu lar equivalents of nickelocene, Ni(C5H5)(2) = NiCp(2), used as a sourc e of cyclopentadiene yields the Ru6C(CO)(12)Cp(2) (3) cluster. The com pounds 2 and 3 have been characterized by NMR and IR spectroscopy and their crystal structures determined by X-ray diffraction studies.