Communication: Dissolution DNP reveals a long-lived deuterium spin state imbalance in methyl groups.
We report the generation and observation of long-lived spin states in deuterated methyl groups by dissolution DNP. These states are based on population imbalances between manifolds of spin states corresponding to irreducible representations of the C3vpoint group and feature strongly dampened quadrupolar relaxation. Their lifetime depends on the activation energies of methyl group rotation. With dissolution DNP, we can reduce the deuterium relaxation rate by a factor up to 20, thereby extending the experimentally available time window. The intrinsic limitation of NMR spectroscopy of quadrupolar spins by short relaxation times can thus be alleviated.
Département de Chimie, Ecole Normale Supérieure, CNRS, Laboratoire des Biomolecules (LBM), PSL Research University, UPMC University Paris 06, 24 Rue Lhomond, 75005 Paris, France.
Aditya
A
Jhajharia
Département de Chimie, Ecole Normale Supérieure, CNRS, Laboratoire des Biomolecules (LBM), PSL Research University, UPMC University Paris 06, 24 Rue Lhomond, 75005 Paris, France.
Emmanuelle M M
EM
Weber
Bruker BioSpin, 15 Fortune Drive, Billerica, Massachusetts 01821, USA.
James G
0000000171354736
JG
Kempf
Département de Chimie, Ecole Normale Supérieure, CNRS, Laboratoire des Biomolecules (LBM), PSL Research University, UPMC University Paris 06, 24 Rue Lhomond, 75005 Paris, France.
Daniel
D
Abergel
Département de Chimie, Ecole Normale Supérieure, CNRS, Laboratoire des Biomolecules (LBM), PSL Research University, UPMC University Paris 06, 24 Rue Lhomond, 75005 Paris, France.
Geoffrey
0000000186336098
G
Bodenhausen
Département de Chimie, Ecole Normale Supérieure, CNRS, Laboratoire des Biomolecules (LBM), PSL Research University, UPMC University Paris 06, 24 Rue Lhomond, 75005 Paris, France.
Dennis
D
Kurzbach