Add time:07/11/2019         Source:sciencedirect.com

Photoinduced electron transfer from indolic compounds to 1-PYRENEMETHANOL (cas 24463-15-8) (PyM) in polystyrene latex dispersions has been studied by steady-state and time-resolved fluorescence spectroscopy. The photoinduced electron transfer reaction is observed by monitoring fluorescence quenching of PyM. The indolic compounds employed are tryptamine (Trm) and tryptophan (Trp). From steady-state fluorescence measurements, it is found that the photoinduced electron transfer from Trm to PyM is remarkably enhanced on going from the aqueous homogeneous solution to the latex dispersion, while no such latex effect is observed for the Trp–PyM pair. This is attributed to the fact that Trp is not effectively adsorbed onto the latex particles in contrast to Trm and PyM, as evidenced by the measurement of respective adsorption isotherms. Fluorescence decay curves of PyM in polystyrene latex dispersions are successfully analyzed in terms of two-exponential functions. The analysis reveals that quenching of PyM fluorescence by Trm (i.e., photoinduced electron transfer from the latter to the former) on polystyrene latex surfaces is mainly operated by a static mechanism.

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