Lumata, L., M.E. Merritt, and Z. Kovacs, Influence of deuteration in the glassing matrix on 13C dynamic nuclear polarization. Phys. Chem. Chem. Phys., 2013. 15(19): p. 7032-7035.
Replacement of protons by deuterons in the glassing solvents led to 2-3-fold improvement of the (13)C dynamic nuclear polarization (DNP) solid-state NMR signal for samples doped with large electron spin resonance (ESR) linewidth free radicals galvinoxyl, DPPH, and 4-oxo-TEMPO. Meanwhile, the reverse effect is observed for (13)C DNP using small ESR linewidth free radicals BDPA and trityl OX063.