title: Heteroleptic ruthenium(ii) chromophores based on tunable polytopic 4'-(benzamidinato)-2,2':6',2''-terpyridines.
abstract: A modulable and simple approach towards heteroleptic ruthenium(ii) complexes of amidine-based polypyridine ligands is presented. New complexes 1 and 2 ([(terpyridine)Ru(terpyridine-C6H4-C(NR)(NHR))]2+with R = propyl and R = phenyl derivatives, respectively) were characterized by NMR spectroscopy in solution and by X-ray diffraction, which confirmed the obtention of the (E) stereoisomer alone. Depending on the bulkiness of the R-substituents introduced on the amidine moiety, rotational isomerism around the C-N bond could be observed at r.t. Spectroscopic and electrochemical studies showed that the nature of the R-substituents introduced on the amidine moiety can significantly influence the redox and ground-state acido-basic properties of the complexes, while maintaining their electronic features. This particular tunability of polytopic 4'-(amidinato)-terpyridines offers an interesting perspective for photoactive units in larger multi-functional arrays.
authors: Department of Chemistry, Université de Montréal, Québec, H3T 1J4, Canada. garry.hanan@umontreal.ca.
authors: Michael W
authors: MW
authors: Cooke
authors: Marie-Pierre
authors: MP
authors: Santoni
authors: Bernold
authors: B
authors: Hasenknopf
authors: Garry S
authors: GS
authors: Hanan