Photoinduced Electron Transfer from 3-(9-Anthracene)propyltrimethyl Ammonium Bromide and Pyrene to Methyl viologen on the Surface of Polystyrene Latex Particles

Abstract

Photoinduced electron transfer from anthracene (An), 3-(9-anthracene)propyltrimethylammonium bromide (APTAB), and pyrene (Py) to methyl viologen (MV2+) in polystyrene (PS) latex dispersions has been studied by steady-state fluorescence, time-resolved fluorescence, and diffuse reflectance flash photolysis spectroscopy. Steady-state fluorescence measurements showed that the photoinduced electron transfer from APTAB and Py to MV2+ is remarkably enhanced on going from the aqueous homogeneous solution to the latex dispersion, whereas no such significant latex effect is observed for the An−MV2+ pair. This seems to be because An molecules deeply penetrate into the latex particles in contrast to APTAB, Py, and MV2+. The fluorescence decay curves of APTAB in PS latex dispersions are conformed to double-exponential functions. The analysis reveals that quenching of APTAB fluorescence by MV2+ (i.e., photoinduced electron transfer from the former to the latter) on PS latex surfaces is performed by both static and dyna...