Lithium complexes with bridging and terminal NHC ligands: the decisive influence of an anionic tether

Evans, Kieren J. ORCID: https://orcid.org/0000-0003-0111-1709, Campbell, Cameron L., Haddow, Mairi F., Luz, Christian, Morton, Paul A. and Mansell, Stephen M. 2019. Lithium complexes with bridging and terminal NHC ligands: the decisive influence of an anionic tether. European Journal of Inorganic Chemistry 2019 (46) , pp. 4894-4901. 10.1002/ejic.201901003

Preview

PDF - Published Version Available under License Creative Commons Attribution. Download (4MB) | Preview

Abstract

Deprotonation of the fluorenyl-tethered imidazolinium salt [9-(C13H9)C2H4N(CH)C2H4N(2,4,6-Me3C6H2)][BF4] gave a spirocyclic compound that reacted with a synergic mixture of LiPh/LiN(SiMe3)2 or LinBu/LiN(SiMe3)2 to give a dilithium complex incorporating a bridging N(SiMe3)2 ligand. In contrast, deprotonation of the imidazolium salt [9-(C13H9)C2H4N(CH)C2H2N(Me)][Br] instead yielded the free NHC, which reacted with nBuLi to form a dimeric, NHC-bridged dilithium complex. Addition of LiN(SiMe3)2 led to coordination and the formation of a dilithium complex with a bridging N(SiMe3)2 ligand, which was characterised in the solid state as a 1D coordination polymer. The reaction of 1,3-bis(2,6-diisopropylphenyl)-4,5-dihydroimidazol-2-ylidene (SIPr) with lithium indenide and lithium fluorenide gave soluble species with terminal binding of the NHC to the lithium cation and η5 coordination of indenyl or fluorenyl. A symmetrical bridging mode for an NHC donor was therefore observed only if a tethered fluorenyl anion was present with no additional amide ligand.

Item Type:	Article
Date Type:	Publication
Status:	Published
Schools:	Chemistry Cardiff Catalysis Institute (CCI)
Publisher:	Wiley-VCH Verlag
ISSN:	1434-1948
Date of First Compliant Deposit:	15 November 2021
Date of Acceptance:	13 November 2019
Last Modified:	06 May 2023 10:03
URI:	https://orca.cardiff.ac.uk/id/eprint/145505

Citation Data

Cited 9 times in Scopus. View in Scopus. Powered By Scopus® Data

Actions (repository staff only)

Edit Item