Abstract
The new method recently formulated for analyzing the fast tumbling motional ESR hyperfine spectra of perdeuterated nitroxide radicals enriched with 15N(I=1/2) TANOLD-15 (4-hydroxy, 2,2,6,6-tetranethylpiperidine-d17-1-oxyl) are applied to perdeuterated, normal nitroxide radicals with 14N (I=1), TANOLD-14, which are widely utilized as spin probes and labels. The fast motional correlation times τ obtained from different pairs of ESR hyperfine lines from TANOLD-14 spin probes in poly(ethylene oxide) (PEO) polymer matrix are not only mutually consistent, but also agree with those obtained from TANOLD-15 spin probes on the same host matrix. The τ values determined with the present method for normal nitroxide radicals containing 14N should be more accurate and reliable than those obtained with other conventional methods.
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