Abstract

The title compound has been obtained by reacting the hydride HRu 3(CO) 9C 2Bu t with (η 5-C 5H 5) 2Ni 2(CO) 2) in hydrocarbon solvents, and has been characterized by elemental analysis, i.r. and mass spectroscopy. The crystal structure has been determined by X-ray methods. Crystals are monoclinic, space group P2 1/ n, with Z = 4 in a unit cell of dimensions a = 15.514(11), b = 17.003(13), c = 9.138(8) Å, β = 94.6(1)°. The structure has been solved from diffractometer data by Patterson and Fourier methods and refined by full-matrix least-squares to R = 0.036 for 3806 independent observed reflections. The structure of the complex consists of a butterfly arrangement of three Ru and one Ni atoms, bonded to nine carbonyls through the Ru atoms, to a cyclopentadienyl group through the Ni atom and to a rearranged t-butylacetylene through all the metal atoms. The bonding of the alkyne to the cluster with the terminal carbon interacting with all the metals is quite uncommon. The formation of this complex can be interpreted as the reaction of a (η 5-C 5H 5)Ni fragment on a RuRuC face of the tetrahedral Ru 3C core of the starting compound.

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