Over 35% liquid-state 13C polarization obtained via dissolution dynamic nuclear polarization at 7 T and 1 K using ubiquitous nitroxyl radicals

Abstract

The most versatile method to increase liquid-state ¹³C NMR sensitivity is dissolution dynamic nuclear polarization. The use of trityl radicals is usually required to obtain very large ¹³C polarization via this technique. We herein demonstrate that up to 35% liquid-state ¹³C polarization can be obtained in about 1.5 h using ubiquitous nitroxyl radicals in ¹³C-labeled sodium salts by partially deuterating the solvents and using a polarizer operating at 1 K and 7 T.