Na₂[(μ-N,N'-C₁₀H₁₂N₂O₈)(μ-O)(μ-S)Mo₂O₂].2H₂O

Analogs of bridging-oxo complexes of dimolybdenum(V) where sulfide replaces one or both bridges are known. After reduction of [(MoO₃)₂(μ-edta)]⁴⁻ (edta is ethylenediaminetetraacetate) with dithionite at pH 6 in the absence of dioxygen, slow replacement of bridging oxide with sulfide produced in situ produces the title compound, disodium μ-(ethylenediaminetetraacetato)-μ-oxo-μ-sulfido-bis[oxomolybdenum(V)] dihydrate, Na₂[Mo₂O₃S(C₁₀H₁₂N₂O₈)].2H₂O]. IR and NMR spectroscopic analyses are consistent with an unsymmetrical complex. In the molecular structure, the Mo centers have distorted octahedral coordination, with an average Mo—S distance of 2.320 (1) Å and an average bridging Mo—O distance of 1.938 (3) Å. The Mo...Mo contact distance [2.666 (1) Å] is intermediate between those in comparable di-μ-oxo and di-μ-sulfido complexes. Na⁺ ions have five and six nearest O atoms, respectively, in their coordination spheres, which each include one disordered water oxygen.

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