222533-20-2Relevant academic research and scientific papers
Synthesis and reactivity of Mo-Sn compounds: X-ray crystal structure of a novel [Mo(SnCl3)2(CO)2(NCEt)3]
Szymanska-Buzar, Teresa,Glowiak, Tadeusz
, p. 98 - 107 (1999)
[Mo(CO)4(NCMe)2] reacts with SnCl4 in CH2Cl2 to produce a mixture of compounds which can be regarded as the results of oxidative addition with the elimination of CO and the formation of a Mo-Sn bond. The compound [MoCl(SnCl3)(CO)3(NCMe)2] 1 is the main product but others containing Mo-Sn bond compounds can be formed also in variable amounts, as was shown by IR and NMR investigation of the reaction mixture. The structure of a novel [Mo(SnCl3)2(CO)2(NCEt)3] 4 was established by X-ray crystallography. This is the first structurally characterized molybdenum(II) carbonyl complex containing two anionic SnCl3 ligands and the very rare example of the 4:3 piano stool seven-coordinate geometry. In the reaction of 1 with alkynes, complexes were isolated in which CO and/or acetonitrile 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 leads to the catalytic coupling of alkyne molecules and the formation of cycloligomers and polymers. The possible mechanisms for the formation of molybdenum(II) complexes and their role in the catalytic process are discussed.
