title: One-dimensional energy/electron transfer through a helical channel.
abstract: We have synthesized A-D-A-type linear chain chromophores based on oligo(phenylene vinylene) as an electron donor (D) and several electron/energy acceptors (A), which are linked by an alkyl spacer with various lengths and are processed for a helical encapsulation with amylose. Photoinduced electron/energy transfers (eT/ET) of the chromophores are investigated in the presence and absence of the helical encapsulation with respect to D-A distance. Fluorescence intensity of the free chromophores is unusually small, not due to the advancement of eT/ET but most likely to self-quenching by aggregation and/or conformational flexibility in solution. By contrast, the helically encapsulated chromophores exhibit highly efficient eT/ET over a long D-A distance and a well-defined distance effect depending on the acceptor strength.
authors.affiliation: Chemistry Division and Electronics Science & Technology Division, and Institute for Nanoscience, Naval Research Laboratory, Washington, D.C. 20375-5320, USA. oh.kim@nrl.navy.mil
authors.forename: Oh-Kil
authors.initials: OK
authors.lastname: Kim
authors.forename: Jongtae
authors.initials: J
authors.lastname: Je
authors.forename: Joseph S
authors.initials: JS
authors.lastname: Melinger