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Dr. Shu A. Yao, Prof. Kyle M. Lancaster, Dr. Andreas W. Götz, Prof. Serena DeBeer and Prof. John F. Berry X-ray Absorption Spectroscopic, Crystallographic, Theoretical (DFT) and Chemical Evidence for a Chalcogen–Chalcogen Two-Center/Three-Electron Half Bond in an Unprecedented “Subselenide” Se23− Ligand Chemistry - A European Journal 18

Article first published online: 21 JUN 2012 | DOI: 10.1002/chem.201201291

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Doing things by halves: The dimeric compound (Cp′Ni)22-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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