N-H-Aktivierung an Os3 -Clustern. Darstellung und Charakterisierung von Os3(CO)11(NH3), Os3(CO)11(NHC6H10) und OS3(CO)10(μ - H)(μ - NC6H10) / N-H Activation on 0s3 Clusters. Preparation and Characterization of Os3(CO)11(NH3), Os3(CO)11(NHC6H10) and Os3(CO)10(μ-H)(μ-NC6H10)

The ammonia complex Os3(CO)11(NH3) was prepared by aminoxide induced carbonyl substitution of Os3(CO)12. Upon heating one hydrogen atom in Os3(CO)11(NH3) is transferred onto the metal frame to yield the complex Os3(CO)10(μ-H)(μ-NH2). Reaction of Os3(CO)11(NH3) with cyclohexanone affords the ketimine complex Os3(CO)11(NHC6H1O), which can be transformed thermally into Os3(CO)10(μ-H)(μ-NC6H10). The N-H bond of the ketimine ligand is activated under milder conditions than that of the ammonia ligand.