Doing things by halves: The dimeric compound (Cp′Ni)2(μ2-Se2) (Cp′=1,2,3,4-tetraisopropylcyclopentadienyl), shown in the scheme, was investigated by using low temperature X-ray crystallography and X-ray absorption spectroscopy. The Se K-edge energy strongly indicates a Se physical oxidation state of −1.5, consistent with an unprecedented two-center/three-electron half-bonded Se23− or “subselenide” ion.
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