Stepwise Formation of Heterometallic Cluster Compounds (C5Me5)WRu5(μ6-C)(μ-CCH2Ph)(μ-H)2(CO)13 and (C5Me5)WRu5(μ4-C)(μ3-CCH2Ph)(μ-H)4(CO)12 from Ru5(μ5-C)(CO)15. Reactivity Studies of Carbido Clusters Bearing Acetylide Ligands
摘要:
Treatment of the carbido cluster Ru-5(mu(5)-C)(CO)(15) with Me3NO followed by addition of the tungsten acetylide complexes LW(CO)(3)(CCPh)(L = Cp, C5Me5) affords the two heterometallic cluster complexes LWRu5(mu(5)-C)(CCPh)(CO)(15) (1a, L = Cp; 1b, L = C5Me5) and LWRu5(mu(5)-C)(CCPh)(CO)(13) (2a, L = Cp; 2b, L = C5Me5). Thermolysis of 1 results in the irreversible formation of 2. The reactivity of 2 was studied. Thus, hydrogenation of 2b furnishes the two cluster compounds (C5Me5)WRu5(mu(6)-C)(mu-CCH2Ph)(mu-H)(2)(CO) (3) and (C5Me5)WRu5(mu(4)-C)(mu(3)-CCH2Ph)(mu-H)(4)(CO)(12) (4), generated via 1,1-addition of H-2 to the ligated acetylide and concurrent formation of two or four bridging hydrides. Treatment of 3 with CO gives the octahedral cluster (C5Me5)WRu5(mu(6)-C)(mu-CCH2Ph)(CO)(14) (5). The spectral and structural properties of all species are presented and discussed.