222533-19-9Relevant academic research and scientific papers
Seven-coordinate complexes of molybdenum(II) containing a trichlorogermyl ligand: X-ray crystal structure of a novel [Mo(GeCl3)2(CO)2(NCEt)3]
Szymanska-Buzar, Teresa,Glowiak, Tadeusz,Czelusniak, Izabela
, p. 215 - 224 (2007/10/03)
The oxidative-addition of GeCl4 to [Mo(CO)4(NCMe)2] in CH2Cl2 provides a high-yield and fast route to the trichlorogermyl complex [MoCl(GeCl3)(CO)3(NCMe)2] (1). Beside 1, other compounds containing a Mo-Ge bond are formed, as was shown by IR and NMR investigation of the reaction mixture. These compounds react further with an excess of propionitrile giving among others, a novel, crystallographically characterized [Mo(GeCl3)2(CO)2(NCEt)3] (3). Compound 3 is the first structurally characterized molybdenum(II) carbonyl complex, containing two trichlorogermyl ligands. Reaction of 1 or 3 with an alkyne (PhCCPh, PhCCMe, PhCCH) affords compounds in which CO and/or nitrile ligands were replaced by alkyne ligands. The alkyne molybdenum(II) complexes formed were characterized structurally by IR and NMR spectroscopy. However, the reaction of 1 with phenylacetylene (PA) leads to the catalytic coupling of alkyne molecules and the formation of cyclotrimers and polymers. The possible mechanisms for the formation of molybdenum(II) complexes and their role in the catalytic process are discussed.
