Observing Nearby Nuclei on Paramagnetic Trityls and MOFs via DNP and Electron Decoupling
Dynamic nuclear polarization (DNP) is an NMR sensitivity enhancement technique that mediates polarization transfer from unpaired electrons to NMR-active nuclei. Despite its success in elucidating important structural information on biological and inorganic materials, the detailed polarization-transf...
| Main Authors: | , , , , , , |
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| Format: | Article |
| Language: | English |
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Wiley
2023
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| Online Access: | https://hdl.handle.net/1721.1/148008 |
| _version_ | 1811084402070913024 |
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| author | Tan, Kong Ooi Yang, Luming Mardini, Michael Boon Cheong, Choon Driesschaert, Benoit Dincă, Mircea Griffin, Robert G |
| author2 | Massachusetts Institute of Technology. Department of Chemistry |
| author_facet | Massachusetts Institute of Technology. Department of Chemistry Tan, Kong Ooi Yang, Luming Mardini, Michael Boon Cheong, Choon Driesschaert, Benoit Dincă, Mircea Griffin, Robert G |
| author_sort | Tan, Kong Ooi |
| collection | MIT |
| description | Dynamic nuclear polarization (DNP) is an NMR sensitivity enhancement technique that mediates polarization transfer from unpaired electrons to NMR-active nuclei. Despite its success in elucidating important structural information on biological and inorganic materials, the detailed polarization-transfer pathway from the electrons to the nearby and then the bulk solvent nuclei, and finally to the molecules of interest-remains unclear. In particular, the nuclei in the paramagnetic polarizing agent play significant roles in relaying the enhanced NMR polarizations to more remote nuclei. Despite their importance, the direct NMR observation of these nuclei is challenging because of poor sensitivity. Here, we show that a combined DNP and electron decoupling approach can facilitate direct NMR detection of these nuclei. We achieved an ∼80 % improvement in NMR intensity via electron decoupling at 0.35 T and 80 K on trityl radicals. Moreover, we recorded a DNP enhancement factor of ϵ ${\varepsilon{} }$ ∼90 and ∼11 % higher NMR intensity using electron decoupling on paramagnetic metal-organic framework, magnesium hexaoxytriphenylene (MgHOTP MOF). |
| first_indexed | 2024-09-23T12:50:08Z |
| format | Article |
| id | mit-1721.1/148008 |
| institution | Massachusetts Institute of Technology |
| language | English |
| last_indexed | 2024-09-23T12:50:08Z |
| publishDate | 2023 |
| publisher | Wiley |
| record_format | dspace |
| spelling | mit-1721.1/1480082023-02-11T03:26:47Z Observing Nearby Nuclei on Paramagnetic Trityls and MOFs via DNP and Electron Decoupling Tan, Kong Ooi Yang, Luming Mardini, Michael Boon Cheong, Choon Driesschaert, Benoit Dincă, Mircea Griffin, Robert G Massachusetts Institute of Technology. Department of Chemistry Dynamic nuclear polarization (DNP) is an NMR sensitivity enhancement technique that mediates polarization transfer from unpaired electrons to NMR-active nuclei. Despite its success in elucidating important structural information on biological and inorganic materials, the detailed polarization-transfer pathway from the electrons to the nearby and then the bulk solvent nuclei, and finally to the molecules of interest-remains unclear. In particular, the nuclei in the paramagnetic polarizing agent play significant roles in relaying the enhanced NMR polarizations to more remote nuclei. Despite their importance, the direct NMR observation of these nuclei is challenging because of poor sensitivity. Here, we show that a combined DNP and electron decoupling approach can facilitate direct NMR detection of these nuclei. We achieved an ∼80 % improvement in NMR intensity via electron decoupling at 0.35 T and 80 K on trityl radicals. Moreover, we recorded a DNP enhancement factor of ϵ ${\varepsilon{} }$ ∼90 and ∼11 % higher NMR intensity using electron decoupling on paramagnetic metal-organic framework, magnesium hexaoxytriphenylene (MgHOTP MOF). 2023-02-10T15:14:02Z 2023-02-10T15:14:02Z 2022 2023-02-10T15:10:21Z Article http://purl.org/eprint/type/JournalArticle https://hdl.handle.net/1721.1/148008 Tan, Kong Ooi, Yang, Luming, Mardini, Michael, Boon Cheong, Choon, Driesschaert, Benoit et al. 2022. "Observing Nearby Nuclei on Paramagnetic Trityls and MOFs via DNP and Electron Decoupling." Chemistry - A European Journal, 28 (68). en 10.1002/CHEM.202202556 Chemistry - A European Journal Creative Commons Attribution 4.0 International license https://creativecommons.org/licenses/by/4.0/ application/pdf Wiley Wiley |
| spellingShingle | Tan, Kong Ooi Yang, Luming Mardini, Michael Boon Cheong, Choon Driesschaert, Benoit Dincă, Mircea Griffin, Robert G Observing Nearby Nuclei on Paramagnetic Trityls and MOFs via DNP and Electron Decoupling |
| title | Observing Nearby Nuclei on Paramagnetic Trityls and MOFs via DNP and Electron Decoupling |
| title_full | Observing Nearby Nuclei on Paramagnetic Trityls and MOFs via DNP and Electron Decoupling |
| title_fullStr | Observing Nearby Nuclei on Paramagnetic Trityls and MOFs via DNP and Electron Decoupling |
| title_full_unstemmed | Observing Nearby Nuclei on Paramagnetic Trityls and MOFs via DNP and Electron Decoupling |
| title_short | Observing Nearby Nuclei on Paramagnetic Trityls and MOFs via DNP and Electron Decoupling |
| title_sort | observing nearby nuclei on paramagnetic trityls and mofs via dnp and electron decoupling |
| url | https://hdl.handle.net/1721.1/148008 |
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