Unsaturated Osmium–Tin Complexes from Reactions of Osmium Polyhydrides

Reactions of the osmium polyhydride complexes Cp*OsH5 (Cp* = η5-C5Me5) and Cp*2Os2(μ-H)4 with the amidostannylene DMPSnN(SiMe3)2 (DMP = C6H3-2,6-Mes2, Mes = mesityl) are reported. Treatment of Cp*OsH5 with DMPSnN(SiMe3)2 in n-pentane results in the rapid formation of osmiostannylene Cp*OsH4SnDMP (1), which precipitates from solution. While 1 is stable in the solid state, it decomposes in solution to form the μ2-stannylyne complex Cp*H4Os(μ-SnDMP)OsH3Cp* (2). Complex 2 can be prepared in a targeted manner by the reaction of Cp*OsH5 with DMPSnN(SiMe3)2 in toluene over an extended period. Cp*2Os2(μ-H)4 reacts with DMPSnN(SiMe3)2 to form the unique μ2-hydridostannylene complex Cp*2Os2(μ-H)2{μ-Sn(H)DMP} (3).