865533-01-3Relevant academic research and scientific papers
Synthesis, structure, and transformation of novel osmium azine and ylide complexes
Chiu, Te-Wei,Liu, Yen-Hsiang,Chi, Kai-Ming,Wen, Yuh-Sheng,Lu, Kuang-Lieh
, p. 6425 - 6430 (2005)
Three novel triosmium complexes with unusual coordination characteristics are reported. Treatment of the hydridotriosmium cluster (μ-H) 2Os3(CO)10 with CNNPPh3 in CH 2Cl2 gave complexes (μ-H)Os3(CO) 10(μ2-η2-C(H)-NNPPh3) (1) and (μ-H)Os3(CO)10(μ2-η1- CHPPh3) (2). Complex 1 represents the first example of the existence of a coordinated phosphinazine ligand. An in-situ 1H NMR study showed that the reaction of (μ-H)2Os3(CO)10 with CNNPPh3 produced complex 1 as the initial product in 100% conversion. The latter is not stable in solution and slowly eliminates nitrogen to form an unusual ylide complex 2 in quantitative yield. The thermolysis of 2 in refluxing toluene afforded (μ-H)3Os3(CO) 9(μ3-η1-CCO2CH2Ph) (3) as a colorless compound. Complexes 1-3 were characterized by spectroscopic methods and single-crystal X-ray diffraction analysis. The interesting feature of structure 3 is the presence of a μ3-alkylidyne ligand where the symmetrically triply bridged CCO2CH2Ph fragment lies perpendicular to and above the triosmium triangle.
