Synthesis and carbon-13 nuclear magnetic resonance studies of the hexanuclear osmium clusters [H2Os6(CO)18], [HOs6(CO)18]–, and [Os6(CO)18]2–

Abstract

The bicapped tetrahedral osmium carbonyl, [Os₆(CO)₁₈] undergoes a reversible structural transformation when treated with reducing agents to give [Os₆-(CO)₁₈]^2–, the spectroscopic properties of which are consistent with a regular octahedral O_h osmium geometry; the compounds [H₂Os₆(CO)₁₈] and [HOs₆(CO)₁₈]^– are produced upon acidification of this dianion.