THE COORDINATION AND STRUCTURE OF A THIOLATE-TERMINATED MOLECULAR-SCALE WIRE LINKED TO A TRIOSMIUM CLUSTER

The molecule (p,p)-HSC6H4C=CC6H4C=CC6H5 has been attached to a triosmi um cluster and characterized crystallographically. The complex Os-3(CO )(10)(mu-H)(mu-SC6H4C=CC6H4C=CC6H5) (1) was obtained in 49% yield from the reaction of the thiol HSC6H4C=CC6H4C=CC6H5 with OS3(CO)(10)(NCMe) (2). The sulfur atom bridges two metal atoms on the edge of a triangul ar cluster pf three osmium atoms. The three aryl rings are nearly copl anar. The ligand is 18.27(2) Angstrom in length from the sulfur atom t o the para-carbon atom of the third aryl ring. This compound may serve as a model for the coordination of thiol-terminated molecular wires t o metallic probe surfaces.