Stabilization of a bismuth-bismuth double bond by anionic N-heterocyclic carbenes

The bismuth dichloride complex (WCA-IDipp)BiCl 2 , which bears an anionic N-heterocyclic carbene ligand with a weakly coordinating borate moiety (WCA-IDipp, WCA = B(C 6 F 5 ) 3 , IDipp = 1,3-bis(2,6-diisopropylphenyl)imidazolin-2-ylidene), was prepared by salt metathesis reaction between BiCl 3 and...

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Bibliographic Details
Published in:Dalton transactions : an international journal of inorganic chemistry 2021-02, Vol.5 (4), p.122-125
Main Authors: Ho, Luong Phong, Tamm, Matthias
Format: Article
Language:English
Subjects:
Bismuth
Carbenes
Crystallography
Dichlorides
Lithium
Metathesis
Toluene
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Summary:The bismuth dichloride complex (WCA-IDipp)BiCl 2 , which bears an anionic N-heterocyclic carbene ligand with a weakly coordinating borate moiety (WCA-IDipp, WCA = B(C 6 F 5 ) 3 , IDipp = 1,3-bis(2,6-diisopropylphenyl)imidazolin-2-ylidene), was prepared by salt metathesis reaction between BiCl 3 and the lithium salt (WCA-IDipp)Li·toluene. Subsequent two-electron reduction with 1,4-bis(trimethylsilyl)-1,4-dihydropyrazine afforded the dibismuthene (WCA-IDipp) 2 Bi 2 , which displays a bismuth-bismuth double bond. Anionic N-heterocyclic carbenes have been employed for the isolation of the first dicarbene-dibismuth complex; the resulting dibismuthene features a trans -bent geometry with a Bi-Bi double bond and short intramolecular Bi-C ipso contacts.
ISSN:1477-9226
1477-9234
DOI:10.1039/d1dt00140j