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The dinuclear compound, [Nb2Cl6(C2H6S)1.7(C2H6Se)1.3], features an NbIII=NbIII double bond [2.6878 (5) Å]. The mol­ecule lies on a twofold rotation axis that passes through the middle of this bond as well as through the bridging dimethyl sulfide ligand. The NbIII ion exists in an octa­hedral coordination environment defined by two terminal and two bridging Cl atoms, and (CH3)2Se/(CH3)2S ligands. The (bridging) ligand lying on the twofold rotation axis is an ordered (CH3)2S ligand, whereas the terminal ones on a general position are a mixture of (CH3)2Se and (CH3)2S ligands in a 0.647 (2):0.353 (2) ratio (the methyl C atoms are also disordered).
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