Showing papers by "Alison M. Funston published in 2004"

Charge Transfer through Terthiophene End-Capped Poly(arylene ethynylene)s

Abstract: Two poly(arylene ethynylene)s (PAEs) that are end-capped with α-terthiophene (T3) groups were prepared and structurally characterized by proton NMR, GPC, and optical spectroscopy. One of the polymers (T3PPE13) features a backbone structure that alternates phenylene ethynylene and bis(alkoxy)phenylene ethynylene repeat units. The second T3 end-capped polymer (T3PBpE12) features an alternating structure with biphenylene ethynylene and bis(alkoxy)phenylene ethynylene repeats. The absorption spectra of the T3 end-capped polymers are almost the same as those of the corresponding “parent polymers” (PPE164 and PBpE21, respectively) that lack the T3 end-groups. By contrast, whereas the fluorescence spectra of the parent polymers is dominated by a blue fluorescence with λmax = 425 nm, the emission spectra of the end-capped polymers contains a significant contribution of a green fluorescence (λ = 500−550 nm). This signals that the singlet exciton is efficiently trapped by the T3 end groups. Pulse radiolysis studies...