J-driven Dynamic Nuclear Polarization for sensitizing high field solution state NMR

TL;DR

This paper proposes a novel DNP method called J-driven DNP to improve high-field solution-state NMR sensitivity by using biradicals with specific exchange couplings, addressing a key limitation of current techniques.

Contribution

It introduces a new J-driven DNP approach utilizing inter-electron exchange couplings to enhance high-field solution NMR sensitivity.

Findings

J-driven DNP shows potential for significant sensitivity enhancement.

The method addresses decay of DNP efficiency at high magnetic fields.

Potential for broad application in high-field solution NMR experiments.

Abstract

Dynamic nuclear polarization is widely used to enhance the sensitivity of nuclear magnetic resonance. It is presently the method of choice for enhancing the sensitivity of high-field solid state NMR experiments performed under cryogenic conditions. In liquids, however, its efficiency decays rapidly with magnetic field Bo and with the rotational correlation time, leading to negligible enhancements in mid- and high-field solution-state NMR experiments for all but exceptional cases. This study discusses a potential solution to this fundamental sensitivity problem, that relies on biradical species possessing inter-electron exchange couplings, that are on the order of the electron Larmor frequency.