Reversible photoinduced electron transfer in a ruthenium poly(2-methoxyaniline-5-sulfonic acid) composite film.
In situ electron spin resonance (ESR) studies have been performed on composite films consisting of a ruthenium tris(bipyridyl) complex and an inherently conducting polymer, poly(2-methoxyaniline-5-sulfonic acid) (PMAS). The composites were investigated under white light irradiation and potential control conditions to probe photoinduced electron transfer between the ruthenium metal center and the conducting polymer. PMAS exhibited a clear ESR signal, characteristic of the presence of mobile single spin polarons within the polymer structure. Irradiation of the PMAS in the presence of the ruthenium metal center resulted in the photo-oxidation of the Ru (2+) to the Ru (3+) state, as a result of which the PMAS ESR signal was replaced by a response typical of the Ru (3+) salt. Upon removal of the illumination, reversible photo switching occurred. This reversibility makes these novel composites promising for applications in areas such as chemical sensors, light switching, and light harvesting devices.
Dennany
Lynn
L
Intelligent Polymer Research Institute and ARC Centre of Excellence for Electromaterials Science, University of Wollongong, Northfields Avenue, Wollongong NSW 2522, Australia.
Innis
Peter C
PC
Wallace
Gordon G
GG
Forster
Robert J
RJ
D000814:Aniline Compounds / Q000737:chemistry* / Q000528:radiation effects; D004578:Electron Spin Resonance Spectroscopy; D004579:Electron Transport; D008956:Models, Chemical; D010084:Oxidation-Reduction; D055668:Photochemical Processes; D013451:Sulfonic Acids / Q000737:chemistry* / Q000528:radiation effects; D013997:Time Factors
D000814:Aniline Compounds; D013451:Sulfonic Acids; C525236:poly(2-methoxyaniline-5-sulfonic acid)