Abstract
A protonated, charged free radical of methylphenazine methosulfate (PMS) was generated at carbon electrodes in a buffered aqueous medium. This radical diffused from the aqueous phase into nonpolar organic solvents, where it was stable for extended periods. The electron spin resonance (ESR) spectrum of the free radical species in the nonpolar solvent was significantly different from that of the aqueous species. This differences was attributed to the loss of electric charge through deprotonation at the solution interface, followed by solvation of the uncharged species in the organic phase. ESR spectra are presented for PMS free radicals in polar and nonpolar liquid phases, along with electrochemical results and conclusions regarding the mechanisms of movement and toxicity of phenazyl free radicals in biological systems.
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