ArticlePhysical chemistry chemical physics : PCCP2024
AsymPol-TEKs as efficient polarizing agents for MAS-DNP in glass matrices of non-aqueous solvents.
Article in Physical chemistry chemical physics : PCCP, 2024. The graph could read no effect estimate from its abstract, so it casts no vote on the map. Cited by 5 papers.
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Who cites it
5 citing papers in PubMed, 16 citations in OpenAlex.
- Bimodal Cholesterol for Correlative In-Cell DNP Solid-State NMR and Confocal Microscopy of the Plasma Membrane.Journal of the American Chemical Society · 2026Article
- Systematic Evaluation of Polarizing Agents for Dynamic Nuclear Polarization Enhanced NMR.Angewandte Chemie (International ed. in English) · 2025Article
- Indirect Detection of the Protons in and around Biradicals and their Mechanistic Role in MAS-DNP.The journal of physical chemistry letters · 2025Article
- Sorbitol-Based Glass Matrices Enable Dynamic Nuclear Polarization beyond 200 K.The journal of physical chemistry letters · 2024Article
- Characterization of dielectric properties and their impact on MAS-DNP NMR applications.Journal of magnetic resonance (San Diego, Calif. : 1997) · 2024Article
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Authors and funding
13 authors at 4 institutions in 4 countries.
Funding
Abstract
Two polarizing agents from the AsymPol family, AsymPol-TEK and cAsymPol-TEK (methyl-free version) are introduced for MAS-DNP applications in non-aqueous solvents. The performance of these new biradicals is rationalized in detail using a combination of electron paramagnetic resonance spectroscopy, density functional theory, molecular dynamics and quantitative MAS-DNP spin dynamics simulations. By slightly modifying the experimental protocol to keep the sample temperature low at insertion, we are able to obtain reproducable DNP-NMR data with 1,1,2,2-tetrachloroethane (TCE) at 100 K, which facilitates optimization and comparison of different polarizing agents. At intermediate magnetic fields, AsymPol-TEK and cAsymPol-TEK provide 1.5 to 3-fold improvement in sensitivity compared to TEKPol, one of the most widely used polarizing agents for organic solvents, with significantly shorter DNP build-up times of ∼1 s and ∼2 s at 9.4 and 14.1 T respectively. In the course of the work, we also isolated and characterized two diastereoisomers that can form during the synthesis of AsymPol-TEK; their difference in performance is described and discussed. Finally, the advantages of the AsymPol-TEKs are demonstrated by recording 2D
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Registered trials
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