Synthesis and molecular structures of phenylacetylide triosmium clusters

The thermal decarbonylation of [Os3H(CO)10(μ,η2-CCPh)] (1) results in the complex [Os3H(CO)9(μ3,η2-CCPh)] (2) in a quantitative yield. The X-ray structural analysis has been performed for 1 and 2. The dependence of dynamic behavior of triosmium clusters on their structure is discussed.

The X-ray structural analysis has been performed for stereochemical non-rigidity (−100 °C) cluster [Os3H(CO)10(μ,η2-CCPh)] (1). Thermolysis of 1 results in the complex [Os3H(CO)9(μ3,2η2-CCPh)] (2) in a quantitative yield.Figure optionsDownload as PowerPoint slideResearch highlights
► The crystal structure of the highly fluxional σ,π-acetylenide cluster has been obtained.
► The efficient method of conversion of σ,π-acetylide ligand into the σ,2π coordination mode on triosmium clusters has been proposed.
► The dependence of dynamic behavior of a series of σ,π-acetylide osmium clusters on their structure is discussed.