Lilja Kristinsdóttir, Ph.D student at the Department of Chemistry at University of Oxford will give a lecture titled Electronic Modification of NHCs Using Boryl Substituents.
Abstract
Recent results suggest that the unique electronic properties of the boryl ligand class, -BX2, can be employed to decrease the HOMO-LUMO gap of metal complexes.1,2 My work focuses on boryl substituted N-heterocyclic carbenes (bNHCs). On NHCs, boryl substituents are likely to influence the σ-donor and π-acceptor properties of the carbene centre. Additionally, Dipp substituted diazaboryl substituents are likely to give super bulky NHCs. In this fashion, both the steric and the electronic properties of the NHCs can be altered merely by changing the Nsubstituents. Attempts to deprotonate 1,3-Dipp-1,3,2-diazaboryl disubstituted imidazolium salt have displayed the electronic properties expected.
Figure 1: I 1,3-Dipp-1,3,2-diazaboryl disubstituted NHC II Crystal structure of 1,3-Dipp- 1,3,2-diazaboryl disubstituted imidazolium salt.
References
1. Protchenko, A. V.; Birjkumar, K. H.; Dange, D.; Schwarz, A. D.; Vidovic, D.; Jones, C.; Kaltsoyannis, N.; Mountford, P.; Aldridge, S. J. Am. Chem. Soc., 2012, 134, 6500.
2. Protchenko, A. V.; Saleh, L. M. A.; Blake, M. P.; Schwarz, A. D.; Kolychev, E. L.; Thompson, A. L.; Jones, C.; Mountford, P.; Aldridge, S. submitted.