875062-46-7Relevant academic research and scientific papers
Triosmium clusters containing bridging dppm and EPh (E = S, Te) ligands: X-ray structures of [(μ-H)Os3(CO)7(μ-SPh) {μ3-η4-Ph2PCHP(Ph)C6H 4}], [Os3(CO)8(μ-SPh)2(μ-dppm) ] and [Os3(CO)8(μ-TePh)2(μ-dppm)]
Kabir, Shariff E.,Saha, Madhu S.,Tocher, Derek A.,Hossain, G.M. Golzar,Rosenberg, Edward
, p. 97 - 104 (2007/10/03)
Heating [Os3(CO)10(μ-dppm)] (1) with two equivalents of PhSSPh in toluene under reflux provided three new triosmium compounds [(μ-H)Os3(CO)7(μ-SPh){μ3- η4-Ph2PCHP(Ph)C6H4}] (2), [Os3(CO)8(μ-SPh)2(μ-dppm)] (3) and [(μ-H)Os3(CO)7(μ-η2-SC 6H4)(μ-SPh)(μ-dppm)] (4) in 20%, 21% and 26% yields, respectively. In contrast, a similar reaction of 1 with two equivalents of PhTeTePh in refluxing toluene gave the binuclear compound [Os 2(CO)4(μ-TePh)2(μ-dppm)] (6) in 15% yield, and two 50 electron isomeric compounds 5 and 7 with the formula [Os 3(CO)8(μ-TePh)2(μ-dppm)] in 20% and 23% yields, respectively. Thermolysis of 3 at 110 °C afforded 4 in 53% yield which on further thermolysis in refluxing octane at 128 °C gave 2 in 45% yield. Thermolysis of 3 in refluxing octane also gave 2 in 50% yield. The new compounds, 2-7, were all spectroscopically characterized, and the X-ray structures of 2, 3 and 7 have been determined. Compound 2 contains a bridging SPh ligand and a μ3,η4-Ph2PCHP(Ph)C 6H4 ligand, formed by two kinds of C-H activation, including orthometallation of a phenyl group as well as an unusual activation of the methylene group of the dppm ligand. The molecular structure of 3 reveals that two SPh groups span the open Os-Os edge of the Os3 triangle, while the dppm ligand bridges one of the closed Os-Os edges. In compound 7, one TePh group spans the open Os-Os edge, while the other spans one of the two closed Os-Os edges and the dppm ligand bridges the third Os-Os vector.
