Three-spin solid effect and the spin diffusion barrier in amorphous solids
Name
eaax2743.full.pdf
Description
Published version
Size
538.58 KB
Format
Adobe PDF
Checksum (MD5)
3012918c955566f34c7ee5618c2e792c
Author(s)
Tan, Kong Ooi
Mardini, Michael
Yang, Chen
Ardenkjaer-Larsen, Jan-Henrik
Griffin, Robert Guy
Date Issued
July 2019
Journal
Science Advances
Publisher
American Association for the Advancement of Science (AAAS)
Citation
Tan, Kong Ooi, et al., "Three-spin solid effect and the spin diffusion barrier in amorphous solids." Science Advances 5, 7 (July 2019): no. eaax2743 doi 10.1126/SCIADV.AAX2743 ©2019 Author(s)
Version
Final published version
Abstract
Dynamic nuclear polarization (DNP) has evolved as the method of choice to enhance NMR signal intensities and to address a variety of otherwise inaccessible chemical, biological and physical questions. Despite its success, there is no detailed understanding of how the large electron polarization is transferred to the surrounding nuclei or where these nuclei are located relative to the polarizing agent. To address these questions we perform an analysis of the three-spin solid effect, and show that it is exquisitely sensitive to the electron-nuclear distances. We exploit this feature and determine that the size of the spin diffusion barrier surrounding the trityl radical in a glassy glycerol–water matrix is <6 Å, and that the protons involved in the initial transfer step are on the trityl molecule. 1H ENDOR experiments indicate that polarization is then transferred in a second step to glycerol molecules in intimate contact with the trityl.
MIT Department
Massachusetts Institute of Technology. Department of Chemistry
Francis Bitter Magnet Laboratory (Massachusetts Institute of Technology)
Terms of Use
Creative Commons Attribution NonCommercial License 4.0
Persistent DSpace Link
DOI of Published Version
https://doi.org/10.1126/SCIADV.AAX2743
