Reactions of the unsaturated triosmium cluster [(μ-H)Os3(CO)8(Ph2PCH2P(Ph)C6H4)] with HX (X=Cl, Br, F, CF3CO2,CH3CO2): X-ray structures of [(μ-H)Os3(CO)7(η1-Cl)(μ-Cl)2(μ-dppm)],[(μ-H)2Os3(CO)8(Ph2PCH2P(Ph)C6H4)]+[CF3O]− and the two isomers of [(μ-H)Os3(CO)8(μ-Cl)(μ-dppm)]
摘要:
Treatment of the electronically unsaturated cluster [(mu-H)Os-3(CO)(8)(Ph2PCH2P(Ph)C6H4)] (1) with HCl gas at ambient temperature in dichloromethane afforded (mu-H)Os-3(CO)(8)( t-Cl)(mu-dppm) (2) and [(mu-H)Os-3(CO)(7)(eta(1)-Cl)(mu-Cl)(2)(mu-dppm)] (3). Thermolysis of 2 at 110 degrees C led to an isomer of 2, 4. A similar reaction of I with HBr gas gave [(mu-H)Os-3(CO)(8)(mu-Br)(mu-dppm)] (5) as the only product which does not isomerize at 110 degrees C. In sharp contrast, treatment of 1 with HF gas gave the protonated species [(mu-H)(2)Os-3(CO)(8)(Ph2PCH2P(PhC6H4 (6). Treatment of I with CF3CO2H also gave cation 6 whereas CH3CO2H yielded [(mu-H)Os-3(CO)(8)(mu-eta(2)-CH3CO2)( mu-dppm)] (7). Structures of 2, 3, 4 and 6 were established crystallographically. In 2, both the chloride and the hydride ligands simultaneously bridge the same Os-Os edge and the dppm spans another Os-Os bond whereas in 4, all the three ligands bridge the same Os-Os edge. Compound 3 is comprised of an open OS3 arrangement in which one chloride bridges the open (OsOs)-Os-... edge, another chloride and a hydride mutually bridge an Os-Os bond and the third chloride is terminally coordinated to one of the Os atoms of the dppm bridged edge. The cation 6 consists of a triangle of osmium atoms in which the shortest Os-Os edge is bridged by a hydride and the metallated phenyl ring and the longest edge is bridged by another hydride and the diphosphine ligand. (c) 2005 Elsevier B.V. All rights reserved.