Synthesis and X-ray analysis of the hydrido-carbido-monoanion [HOs10C(CO)24]–; a cluster compound with an interstitial hydrogen ligand in a tetrahedral site

Abstract

Protonation of the carbido-dianion [Os₁₀C(CO)₂₄]^2– with cone. H₂SO₄gives [HOs₁₀C(Co)₂₄]^– and H₂Os₁₀C(CO)₂₄; from X-ray analyses of the [Ph₄As]⁺ and [Ph₃MeP]⁺ salts of the hydrido-monoanion, which show a structure with a close-packed carbonyl distribution virtually identical to that of the dianion, it may be deduced that this is the first example of an H-ligand in a tetrahedral site of a polynuclear carbonyl species.