title: Amidine- and amidinate-functionalised N-heterocyclic carbene complexes of silver and chromium.
abstract: A new family of N,N'-bis-(2,6-diisopropylphenyl)-(2,6-diisopropylphenyl-imidazolium)-acetamidines have been developed as NHC proligands and ligands that are functionalised with neutral amidine and anionic amidinato moieties. On coordination they adopt diverse binding modes, depending on the nature of the metal and the reaction conditions. In the Ag, K and Cr complexes reported in this paper, monodentate κ(1)(NHC), bimetallic bridging-(κ(1)-NHC-κ(1)-amidinato) and bidentate (κ(1)-NHC-κ(1)-amidinato) binding modes were observed, respectively. Two of the novel Cr complexes, in the presence of activators, were tested as catalysts for the polymerisation of ethylene showing low activity.
authors.affiliation: Sasol Technology UK Ltd, Purdie Building, North Haugh, St Andrews, Fife, UK KY16 9ST.
authors.forename: Susana
authors.initials: S
authors.lastname: Conde-Guadano
authors.forename: Martin
authors.initials: M
authors.lastname: Hanton
authors.forename: Robert P
authors.initials: RP
authors.lastname: Tooze
authors.forename: Andreas A
authors.initials: AA
authors.lastname: Danopoulos
authors.forename: Pierre
authors.initials: P
authors.lastname: Braunstein