title: Energy transfer in extended thienylene-phenylene-ethynylene dendrimers.
abstract: We present a new family of dendrimers with all-conjugated, thienylene (Th) containing photoactive backbones and branched end-groups. Steady-state spectroscopy demonstrates a donor-acceptor system, while picosecond time-resolved fluorescence characterizes a vectorial energy transfer from phenylene-ethynylene (PE) units at the periphery to thienylene-containing PE units at the core. Energy transfer rates of 1.5 and 3.5 ps are observed for generation 2 and 3 dendrimers, indicative of a weakly coupled donor-acceptor system, with couplings on the order of 40-60 cm(-1).
authors.affiliation: Department of Chemistry and Center for Chemical Physics, University of Florida, Gainesville, Florida 32611-7200, USA.
authors.forename: Sevnur
authors.initials: S
authors.lastname: Kömürlü
authors.forename: Seoung Ho
authors.initials: SH
authors.lastname: Lee
authors.forename: Tracy
authors.initials: T
authors.lastname: McCarley
authors.forename: Kirk S
authors.initials: KS
authors.lastname: Schanze
authors.forename: Valeria D
authors.initials: VD
authors.lastname: Kleiman