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Tricarbon­yl[9-(triphenyl­phospho­nio)fluorenyl­idene]ruthenium, [Ru(C31H21P)(CO)3], (I), is mononuclear, consisting of a single Ru centre, to which three carbonyl units and a chelating μ3-9-(triphenyl­phospho­nio)fluorenide ylide bind to generate a distorted octa­hedral RuC6 core. Nonacarbonyl-μ3-fluorenyl­idene-μ2-hydrido-triangulo-triosmium(III), [Os3H(C13H7)(CO)9], (II), is trinuclear and presents a triangular triosmium core, nine carbonyl ligands and one fluorenyl­idene ligand. Two of the OsIII centres present a highly distorted hexa­coordinated Os(Os2C4) core and are in turn bridged by a hydride ligand. The remaining OsIII cation is octa­coordinated, with an Os(Os2C6) nucleus. The crystal structures of both compounds are the result of nondirectional forces, much resembling the packing of weakly inter­acting quasi-spherical units, viz. the mol­ecules themselves in (I) and centrosymmetric π–π-bonded dimers in (II).
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