Young‐gi kim, L. Samuelson, J. Kumar
Jan 11, 2002
Citations
0
Influential Citations
13
Citations
Journal
Journal of Macromolecular Science, Part A
Abstract
ABSTRACT The fluorescence of carboxylated and water-soluble poly(3-thiophene acetic acid) (PTAA) and poly[2,5-(3-carboxymethyl urethanyl ethyl) thiophene] (H-PURET) are quenched by low concentrations of methyl viologen in aqueous solutions. The Stern-Volmer constants (Ksv) for these aqueous solutions of polythiophenes are in the order of 3.5×106. However, in contrast, ionically adsorbed monolayers of these polythiophenes on solid supports show fluorescence quenching that is more than two orders of magnitude smaller. The effects of pH and the concentration of the methyl viologen on fluorescence quenching are reported.