Irradiation of a mixture of tungstenocene or molybdenocene dihydride and a metal-metal-bonded dimeric complex has been found to be a convenient route to homo- and heterometallic complexes. The photoreactions of (η5-C5H5)2M1H 2 with [(η5-C5H5)M2(CO) 3]2 (M1, M2 = W, Mo) in DME afford in good yields the bimetallic complexes (η5-C5H5)(CO)M 1(μ,σ-η5-C5H4)-M 2(CO)2(η5-C5H5) with a M1-M2 bond. (1a, M1 = W, M2 = Mo; 1b, M1 = Mo, M2 = W; 1c, M1 = M2 = W; 1d, M1 = M2 = Mo). By use of [(η5-C5R5)Ni(CO)]2 as the dimer part, the heterobimetallic hydrides (η5-C5H5) 2M(μ-H)(μ-CO)Ni(C5R5) (2a, M = W, R = H; 2b, M = W, R = Me; 2c, M = Mo, R = H, 2d, M = Mo, R = Me) were obtained, where the two metallocene cyclopentadienyl rings remain intact and the metal-metal bond is bridged by CO and hydride. Similar photolysis of a mixture of (η5-C5H5)2MH2 and [(η5-C5H5)Ru(CO)2]2 has afforded two trimetallic complexes: (η5-C5H5)(μ,σ-η 5-C5H4)M(μ-CO)2Ru(η 5-C5H5)Ru(η5-C5H 5)-(CO)H (3a, M = W; 3b, M = Mo), where the Ru-Ru bond still exists with a new M-Ru bond and one bridging (μ,σ-η5-C5H4) ring between M and the other Ru, and (μ,σ-η5-C5H4)2-MH 2[(η5-C5H5)Ru(CO)]2 (4a, M = W; 4b, M = Mo), in which both of the cyclopentadienyl rings of the metallocene are metalated with Ru. The crystal and molecular structures of 1a, 2d, 3a, and 4a have been determined by single-crystal X-ray diffraction analysis.
|出版ステータス||Published - 1995|
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