Picture of a sphere with binary code

Making Strathclyde research discoverable to the world...

The Strathprints institutional repository is a digital archive of University of Strathclyde research outputs. It exposes Strathclyde's world leading Open Access research to many of the world's leading resource discovery tools, and from there onto the screens of researchers around the world.

Explore Strathclyde Open Access research content

Lithiated amidines: syntheses and structural characterisations

Barker, J and Barr, D and Barnett, N D R and Clegg, W and CraggHine, I and Davidson, M G and Davies, R P and Hodgson, S M and Howard, J A K and Kilner, M and Lehmann, C W and LopezSolera, I and Mulvey, Robert and Raithby, P R and Snaith, R (1997) Lithiated amidines: syntheses and structural characterisations. Journal of the Chemical Society, Dalton Transactions (6). pp. 951-955. ISSN 0300-9246

Full text not available in this repository. (Request a copy from the Strathclyde author)

Abstract

The reaction of a toluene solution of PhNC(Ph)NHPh (N,N'-diphenylbenzamidine) with n-butyllithium gave the toluene-solvated amidinolithium compound {Li[PhNC(Ph)NPh]}(n) 1. Similarly the same reaction performed in the presence of the Lewis-base donors (Me(2)N)(3)PO (hmpa), Me(2)N(CH2)(2)NMe(2) (tmen) or [Me(2)N(CH2)(2)](2)NMe (pmdien) yielded the amidinolithium complexes {Li[PhNC(Ph)NPh . hmpa]}(2) 2, {Li[PhNC(Ph)NPh]. tmen} 3 and {Li[PhNC(Ph)NPh]. pmdien} 4 respectively. In addition the reaction of a toluene solution of the related amidine PhNC(Me)NHPh(N,N'-diphenylacetamidine) with LiBu(II) in the presence of hmpa afforded {Li[PhNC(Me)NPh]. hmpa}(2) 5. The solid-state structures of 2-5, which have been resolved by single-crystal X-ray diffraction methods, show both similarities and differences The complexes 3 and 4, which contain the di- and tri-dentate ligands tmen and pmdien respectively, are monomeric, whilst use of the unidentate Lewis base hmpa results in dimers 2 and 5. However, the way in which dimerisation is achieved differs. The co-ordination geometry about the lithium cation is clearly influenced by the choice of donor and as such shows how change in the denticity of the donor ligand utilised can have a significant effect on the solid-state structure of the system.