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Default Proton and Carbon-13 Dynamic Nuclear Polarization of Methylated ?-Cyclodextrins #DNPNMR

From The DNP-NMR Blog:

Proton and Carbon-13 Dynamic Nuclear Polarization of Methylated ?-Cyclodextrins #DNPNMR

Caracciolo, F., et al., Proton and Carbon-13 Dynamic Nuclear Polarization of Methylated ?-Cyclodextrins. The Journal of Physical Chemistry B, 2018. 122(6): p. 1836-1845.


https://doi.org/10.1021/acs.jpcb.7b11950


1H and 13C dynamic nuclear polarizations have been studied in 13C-enriched ?-cyclodextrins doped with (2,2,6,6-tetramethylpiperidin-1-yl)oxyl free radical. 1H and 13C polarizations raised above 7.5 and 7%, respectively, and for both nuclear species, the transfer of polarization from the electron spins appears to be consistent with a thermal mixing scenario for a concentration of 9 13C nuclei per molecule. When the concentration is increased to 21 13C nuclei per molecule, a decrease in the spin–lattice relaxation and polarization buildup rates is observed. This reduction is associated with the bottleneck effect induced by the decrease in the number of electron spins per nucleus when both the nuclear spin–lattice relaxation and the polarization occur through the electron non-Zeeman reservoir. 13C nuclear spin–lattice relaxation has been studied in the 1.8–340 K range, and the effects of internal molecular motions and of the free radicals on the relaxation are discussed. 13C hyperpolarization performances and room-temperature spin–lattice relaxation times show that these are promising materials for future biomedical applications.


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