FT-EPR and HPLC Study of the Mechanism of 4-chlorophenol Photolysis

A. OUARDAOUI; D.M. MARTINO; C.A. STEREN; H. VAN WILLIGEN

Applied Magnetic Resonance

Año: 1997 vol. 13 p. 275 - 284

The mechanism of 4-chlorophenol (4CP) photolysis was investigated with the aid of Fourier Transform Electron Paramagnetic Resonance (FT-EPR) and pulsed laser photolisis combined with High Performance Liquid Cheomatographt (HPLC) detection of stable diamagnetic products. With FT-EPR transient free radicals produced by pulsed laser excitation of solutions of 4CP in alcohols could be identified. Time profiles of the FT-EPR spectra provided information on reaction kinetics and Chemically Induced Dinamyc Electron Polarization (CIDEP) effects. It was fond that 4CP photalysis in alcohols lead to the simultaneous formation of the phenoxyl radical and radicals produced by hydrogen abstraction from the solvent.