Abstract
The technique of time-resolved microwave dielectric absorption has been used to measure the dipole moment of the benzylperoxyl radical in benzene, cyclohexane, and decane solutions. The radicals were produced by photolysis of dibenzyl ketone in oxygen-containing solutions with pulses of light at 280 nm from a frequency-doubled dye laser. Benzyl chloride and cyanide were used to model the rotational relaxation behavior of the radical. A dipole moment of 2.4 +/- 0.2 D was found. It is suggested that this polarity may be large enough to significantly affect the location of the portion of the molecule bearing the peroxyl group in radicals formed in heterogeneous systems as micelles or bilayers in water. 16 references, 1 figure, 4 tables.
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