Ferrocenyl-functionalised terpyridines and their transition-metal complexes: syntheses, structures and spectroscopic and electrochemical properties.
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.
Siemeling
Ulrich
U
Department of Physics, University of Kassel, Germany. siemeling@uni-kassel.de
Vor der Brüggen
Jens
J
Vorfeld
Udo
U
Neumann
Beate
B
Stammler
Anja
A
Stammler
Hans-George
HG
Brockhinke
Andreas
A
Plessow
Regina
R
Zanello
Piero
P
Laschi
Franco
F
Fabrizi de Biani
Fabrizia
F
Fontani
Marco
M
Steenken
Steen
S
Stapper
Marion
M
Gurzadyan
Gagik
G