Two new cluster complexes, Os 3(CO) 12(Ph)(μ 3-SnPh), 8 (35% yield), and Os 4(CO) 16(μ 4-Sn), 9 (10% yield), were formed when the complex Os 3(CO) 11(SnPh 3)(μ-H), 6, was heated to reflux in toluene solvent under a CO atmosphere. Compound 8 was transformed to 9 in 28% yield when a solution in octane solvent was heated to reflux under a CO atmosphere. Biphenyl was a coproduct in this reaction. Compound 8 contains three osmium atoms with a triply bridging SnPh group. The triosmium cluster has opened and there is only one Os-Os bond between the three osmium atoms. Compound 9 contains two Os 2(CO) 8 groups held together by a central quadruply bridging tin atom, giving an overall bow-tie structure for the five metal atoms. Two other new compounds, Os 2(CO) 6(μ-SnPh 2) 2(SnPh 3) 2, 10, and HOs(CO) 4(SnPh 3), 11, were formed in 51% and 20% yields, respectively, from the reaction of 6 with HSnPh 3. Compound 10 contains only two osmium atoms linked by an Os-Os bond and two bridging SnPh 2 ligands. Each osmium atom also contains one terminal SnPh 3 ligand. Compound 11 contains only one osmium atom. It has one SnPh 3 ligartd and a hydrido ligand in cis position in the six-coordinate pseudo-octahedral complex. All four new compounds were characterized by single-crystal X-ray diffraction analysis.
ASJC Scopus subject areas
- Physical and Theoretical Chemistry
- Organic Chemistry
- Inorganic Chemistry