Abstract
Observed 2H NMR enhancements with free radicals in solution are far below the dipolar limit. Leakage factors for the deuteron systems are much poorer than for the protonated analogs. This is the result of two factors: (1) unfavorable bulk nuclear relaxation times due to quadrupolar relaxation mechanisms, and (2) weak intermolecular coupling of nuclear and unpaired electron spins. Comparison of radical-induced nuclear relaxation rates for deuterobenzene with the free radicals GALV and BDPA and the analogous benzene solutions demonstrates the (γN)2 dependence of the dipolar coupling strength. The consequences of these results on future studies for nuclei with I ≠ (1/2) and small γN are discussed.
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