A Stable, Crystalline Beryllium Radical Cation

The alkaline-earth elements (Be, Mg, Ca, Sr, and Ba) strongly favor the formation of diamagnetic compounds in the +2 oxidation state. Herein we report a paramagnetic beryllium radical cation, [(CAAC)2Be]+• (2) [CAAC = cyclic (alkyl)­(amino)­carbene], prepared by oxidation of a zero-valent beryllium...

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Published inJournal of the American Chemical Society Vol. 142; no. 10; pp. 4560 - 4564
Main Authors Wang, Guocang, Walley, Jacob E, Dickie, Diane A, Pan, Sudip, Frenking, Gernot, Gilliard, Robert J
Format Journal Article
LanguageEnglish
Published United States American Chemical Society 11.03.2020
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Summary:The alkaline-earth elements (Be, Mg, Ca, Sr, and Ba) strongly favor the formation of diamagnetic compounds in the +2 oxidation state. Herein we report a paramagnetic beryllium radical cation, [(CAAC)2Be]+• (2) [CAAC = cyclic (alkyl)­(amino)­carbene], prepared by oxidation of a zero-valent beryllium complex with 2,2,6,6-tetramethylpiperidin-1-oxyl (TEMPO). Compound 2 was characterized by EPR spectroscopy, elemental analysis, X-ray crystallography, and DFT calculations. Notably, the isolation of 2 represents the first s-block charged radical and the first crystalline beryllium radical.
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ISSN:0002-7863
1520-5126
DOI:10.1021/jacs.9b13777