title: Photoinduced energy- and electron-transfer processes within dynamic self-assembled donor-acceptor arrays.
abstract: The synthesis and the photophysical properties of a series of noncovalently assembled donor-acceptor systems, dyads, is reported. The presented approach uses an "innocent" coordination compound, a scandium(III) acetyl acetonate derivative, as core and promotor of the dyad formation. Intercomponent photoinduced energy transfer or electron transfer within the dynamic assembly, which yields to a statistical library of donor-acceptor systems, is reported. The assemblies for energy-transfer processes are constituted by an energy donor, Ru(bpy)(3)(2+)-based component (bpy = 2,2'-bipyridine), and by an energy-acceptor moiety, anthracene-based unit, both substituted with a chelating ligand, acetyl acetone, that via coordination with a scandium ion will ensure the formation of the dyad. If N,N,N'N'-tetramethyl-2,5-diaminobenzyl-substituted acetyl acetonate ligands are used in the place of 9-acyl-anthracene, intramolecular photoinduced electron transfer from the amino derivative (electron donor) to the Ru(bpy)(3)(2+)-unit was detected upon self-assembly, mediated by the scandium complex. The photophysical processes can be studied on the lifetime of the kinetically labile complexes.
authors.affiliation: Institut für Organische Chemie, Universität Regensburg, Universitätsstrasse 31, 93040 Regensburg, Germany.
authors.forename: Michael
authors.initials: M
authors.lastname: Kercher
authors.forename: Burkhard
authors.initials: B
authors.lastname: König
authors.forename: Harald
authors.initials: H
authors.lastname: Zieg
authors.forename: Luisa
authors.initials: L
authors.lastname: De Cola