Reaction of [M3(CO)12](M = Ru or Os) with the chalconide elements; X-ray crystal and molecular structure of [Os4(CO)12H2Se2]

Abstract

Reaction of [Os₃(CO)₁₂] with X_n(X = S, Se, or Te) in n-octane under reflux yields [Os₃(CO)₉H₂X], [Os₃(CO)₉X₂], and [Os₄(CO)₁₂H₂X₂], but a CO/H₂ pressure of 35 atm is required to prepare the ruthenium analogues [Ru₃(CO)₉H₂X] and [Ru₃(CO)₉X₂]; an X-ray analysis of [Os₄(CO)₁₂H₂Se₂] shows that it has a novel trigonal prismatic Os₄Se₂ core.