Synthesis and characterisation of [Fe₂M₃(μ₄-E)(μ₃-E')(CO)₁₇] and [Os₃(μ₃-E)(μ₃-E')(CO)₉] (M=Os or Ru; E=S, Se, Te; E'=Se, Te)

Abstract

A set of new chalcogen-bridged mixed metal clusters [Fe₂Os₃(μ₄-E)(μ₃-E')(CO)₁₇] (2, EE'=SeTe; 3, EE'=STe; 4, EE'=Se₂; 5, EE'=SSe) and [Fe₂Ru₃(μ₄-E)(μ₃-E')(CO)₁₇] (12, EE'=SeTe; 13, EE'=STe; 14, EE'=Se₂; 15, EE'=SSe) has been synthesised by facile methods. Thermolysis or photolysis of compounds 2, 3 and 5 afforded the new triosmium mixed chalcogenide clusters [Os₃(μ₃-E)(μ₃-E')(CO)₉] (7, EE'=SeTe; 8, EE'=STe; 10, EE'=SSe). All new compounds were characterised by IR and ¹H-, ⁷⁷Se- and ¹²⁵Te-NMR spectroscopy. Clusters 8, 9 and 12 were structurally characterised by single crystal X-ray diffraction methods.