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Updated: Feb 22, 2026

Isolating Free Carbenes, their Mixed Dimers and Organic Radicals
Published on: April 19, 2019
Isolation of cationic and neutral (allenylidene)(carbene) and bis(allenylidene)gold complexes
Liqun Jin1, Mohand Melaimi1, Arseni Kostenko2
1UCSD-CNRS Joint Research Chemistry Laboratory (UMI 3555) , Department of Chemistry and Biochemistry , University of California San Diego , La Jolla , CA 92093-0358 , USA .
Abstract:
The one-electron reduction of a cationic (allenylidene)[cyclic(alkyl) (amino)carbene]gold(i) complex leads to the corresponding neutral, paramagnetic, formally gold(0) complex. DFT calculations reveal that the spin density of this highly robust coinage metal complex is mainly located on the allenylidene fragment, with only 1.8 and 3.1% on the gold center and the CAAC ligand, respectively. In addition, the first homoleptic bis(allenylidene)gold(i) complex has been prepared and fully characterized.
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