title: Ferrocenyl-functionalised terpyridines and their transition-metal complexes: syntheses, structures and spectroscopic and electrochemical properties.
abstract: Terpyridine ligands of the type Fc'-X-tpy (Fc'=ferrocenyl or octamethylferrocenyl, X=rigid spacer, tpy'=4'-substituted 2,2':6',2''-terpyridine) were prepared, crystallographically characterised and used for the synthesis of di- and trinuclear bis(terpyridine) complexes of RuII, FeII and ZnII. Donor-sensitiser dyads and triads based on RuII were thoroughly investigated by (spectro)electrochemistry, UV/Vis, transient absorption and luminescence spectroscopy, and an energy level scheme was derived on the basis of the data collected. Intramolecular quenching of the photoexcited RuII complexes by the redox-active Fc' groups can occur reductively and by energy transfer. Both the redox potential of the donor Fc' and the nature of the spacer X have a decisive influence on excited-state lifetimes and emission properties of the complexes. Some of the compounds show room-temperature luminescence, which is unprecedented for ferrocenyl-functionalised compounds of this kind.
authors.affiliation: Department of Physics, University of Kassel, Germany. siemeling@uni-kassel.de
authors.forename: Ulrich
authors.initials: U
authors.lastname: Siemeling
authors.forename: Jens
authors.initials: J
authors.lastname: Vor der Brüggen
authors.forename: Udo
authors.initials: U
authors.lastname: Vorfeld
authors.forename: Beate
authors.initials: B
authors.lastname: Neumann
authors.forename: Anja
authors.initials: A
authors.lastname: Stammler
authors.forename: Hans-George
authors.initials: HG
authors.lastname: Stammler
authors.forename: Andreas
authors.initials: A
authors.lastname: Brockhinke
authors.forename: Regina
authors.initials: R
authors.lastname: Plessow
authors.forename: Piero
authors.initials: P
authors.lastname: Zanello
authors.forename: Franco
authors.initials: F
authors.lastname: Laschi
authors.forename: Fabrizia
authors.initials: F
authors.lastname: Fabrizi de Biani
authors.forename: Marco
authors.initials: M
authors.lastname: Fontani
authors.forename: Steen
authors.initials: S
authors.lastname: Steenken
authors.forename: Marion
authors.initials: M
authors.lastname: Stapper
authors.forename: Gagik
authors.initials: G
authors.lastname: Gurzadyan