摘要:
The complex {(eta(5-)C(5)H(3))(2)(SiMe2)(2)}Ru-2(CO)(4) (1), which features the doubly linked dicyclopentadienyl ligand (eta(5)-C5H3)(2)(SiMe2)(2), reacts with phosphines (PMe3, PCy3, PPh3) to give {(eta(5)-C5H3)(2)(SiMe2)(2)}Ru-2(CO)(mu-CO)(2)(PR3) (2a-c), with halogens X-2 (X = Cl, Br, I) to give the Ru-Ru-cleaved products {(eta(5)-C5H3)(2)(SiMe2)(2)}Ru-2(CO)(4)(X)(2) (3a-c), with X-2 and AgTfO to give [{(eta(5)-C5H3)(2)(SiMe2)(2)}Ru-2(CO)(4)(mu-X)]+TfO- (X = Cl, Br, I; 4a-c), and with SnCl2 to give {(eta(5)-C5H3)(2)(SiMe2)(2)}Ru-2(CO)(4)(mu-SnCl2) (5), resulting from the insertion of SnCl2 into the Ru-Ru bond. Reduction of 1 with Na/Hg generates {(eta(5)-C5H3)(2)(SiMe2)(2)}Ru-2(CO)(4)](2-) (6), which reacts with (eta(5)-C5H5)(2)TiCl2 to give {(eta(5)-C5H3)(2)(SiMe2)(2)}Ru-2(CO)(4){mu-Ti(eta(5)-C5H5)(2)} (7). Ultraviolet photolysis of 1 with diphenylacetylene and phenylacetylene yields a series of five dinuclear Ru. complexes (8-10, 12, 13) containing one or two bridging acetylene units. The rigidity of the doubly linked (eta(5)-C5H3)(2)(SiMe2)(2) ligand substantially influences the reactivity and structures of the complexes. Molecular structures of 1, 2a, 3c, 5, 9, 10, and 12 as determined by X-ray diffraction studies are also presented.