PHOTOCHEMISTRY IN HETEROGENEOUS MEDIA - A FOURIER TRANSFORM-EPR STUDY

LEVSTEIN, PATRICIA R.; VAN WILLIGEN, HANS

COLLOIDS AND SURFACES A-PHYSICOCHEMICAL AND ENGINEERING ASPECTS

ELSEVIER SCIENCE BV

Lugar: Amsterdam; Año: 1993 vol. 72 p. 43 - 43

0927-7757

font size="2"> Fourier transform-electron paramagnetic resonance (FT-EPR) is a novel spectroscopic technique that is ideally suited for the study of transient free radicals generated in photochemical reactions. The salient features of the application of FT-EPR in this field of research are the following. (1) The high spectral resolution of the technique makes it possible to identify free radicals. (2) The time evolution of spectra can be monitored over a time regime extending from nanoseconds to milliseconds. Hence, spectral data can give rate constants of radical formation and decay. (3) Signal intensities can reflect  chemically induced electron polarization effects that provide information on the mechanism of radical formation. (4) Measurement of spin-relaxation rates gives an insight into molecular motion. In this paper the application of the technique in a time-resolved study of photoinduced electron transfer in micellar solutions and in the pores of silica gel is presen