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Structural, spectroscopic and electronic properties of a family of face-shared bi-octahedral Ru complexes with a bridging 2,5-di(2-pyridyl)pyrrolide ligand. | LitMetric
A family of Ru2 dimers, [Ru2(μ-κ2N,N':κ2N',N''-dpp)2(μ-X)(X)2]q+ (X = Cl, Br, q = 0 and X = I, q = 1) is synthesized from a [Ru2(OAc)4Cl] paddlewheel starting material. The neutral products are mixed-valence Ru25+ dimers with a Ru-Ru bond order of 0.5, while the cationic iodide is a Ru26+ dimer with formal bond order of 1.0. The Ru-Ru distance is strikingly independent of the identity of the halide and the oxidation state of ruthenium, most likely a consequence of the small bridging nitrogen which constrains the geometry. The spectroscopic properties (EPR, UV/Vis) of the Br complex are consistent with a large σ-σ* splitting in [Ru2(μ-κ2N,N':κ2N',N''-dpp)2(μ-Br)(Br)2].
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