Syntheses and structural characterization of a series of hydrido osmium-palladium carbonyl clusters: [Os₅Pd(CO)₁₆H_n+4(μ-Cl)_2-N] (n = 0-2), [{Os₃Pd(CO)₉(μ-H)₂(μ-Cl)}₂(μ-Cl)₂]·H₂O and [Os₄Pd(CO)₁₁(μ-H)₃(μ-Cl)₃...

Full title: Syntheses and structural characterization of a series of hydrido osmium-palladium carbonyl clusters: [Os5Pd(CO)16Hn+4(μ-Cl)2-N] (n = 0-2), [{Os3Pd(CO)9(μ-H)2(μ-Cl)}2(μ-Cl)2]·H2O and [Os4Pd(CO)11(μ-H)3(μ-Cl)3(C5H5N)]·0.5C6H14. The unsaturated triosmium cluster [Os3(CO)10(μ-H)2] reacted with the complex trans-[Pd(py)2Cl2] (py = pyridine) to give a range of complexes including [Os5Pd(CO)16(μ-H)6] 1, [Os5Pd(CO)16-(μ-H)4H(μ-Cl)] 2, [Os5Pd(CO)16(μ-H)4(μ-Cl)2] 3, [{Os3Pd(CO)9(μ-H)2(μ-Cl)}2] 4, [Os4Pd(CO)11(μ-H)3(μ-Cl)3(py)] 5 and three known osmium clusters, [Os3(CO)10(μ-H)(μ-OH)], [Os3(CO)10(μ-H)(μ-Cl)] and [Os4(CO)13(μ-H)2]. All five mixed-metal clusters were characterized by IR,1H NMR and mass spectroscopy and X-ray crystallography. Complexes 1-3 have similar metal dispositions but different combinations of bridging hydrides and chlorides. They can be viewed as a diosmium fragment connected to the palladium vertex of the Os3Pd tetrahedron through a number of bridging ligands. Complex 4 is dimeric with two Os3Pd tetrahedra tied together by two bridging chlorides in a planar fashion. Complex 5 consists of an Os3Pd tetrahedropn with a fourth osmium atom linked to the palladium vertex by three bridging chlorides. The pyridine ligand is co-ordinated to the singular osmium instead of the palladium atom.