Chakrabrty Tanmoy, Goldin Nir, Feintuch Akiva, Houben Lothar, and Leskes Michal. “Paramagnetic Metal Ion Dopants as Polarization Agents for DNP NMR Spectroscopy in Inorganic Solids.” ChemPhysChem 0, no. ja (May 17, 2018).
Dynamic nuclear polarization (DNP), a technique in which the high electron spin polarization is transferred to surrounding nuclei via microwaves irradiation, equips solid state NMR spectroscopy with unprecedented sensitivity. The most commonly used polarization agents for DNP are nitroxide radicals. However, their applicability to inorganic materials is mostly limited to surface detection. Paramagnetic metal ions were recently introduced as alternatives for nitroxides. Doping inorganic solids with paramagnetic ions can be used to tune material properties and introduces endogenous DNP agents that can potentially provide sensitivity in the particles' bulk and surface. Here we demonstrate the approach by doping Li4Ti5O12 (LTO), an anode material for lithium ion batteries, with paramagnetic ions. By incorporating Gd(III) and Mn(II) in LTO we gain up to 14 fold increase in signal intensity in static 7Li DNP?NMR experiments. These results suggest that doping with paramagnetic ions provides an efficient route for sensitivity enhancement in the bulk of micron size particles.
High-Frequency Dynamic Nuclear Polarization NMR for Solids: Part 1 – An Introduction #DNPNMR
From The DNP-NMR Blog:
High-Frequency Dynamic Nuclear Polarization NMR for Solids: Part 1 – An Introduction #DNPNMR
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Ha, M. and V.K. Michaelis, High-Frequency Dynamic Nuclear Polarization NMR for Solids: Part 1 – An Introduction, in Modern Magnetic Resonance, G.A. Webb, Editor. 2017, Springer International Publishing: Cham. p. 1-24.
https://doi.org/10.1007/978-3-319-28275-6_140-1
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01-04-2018 08:45 AM
Electron Decoupling with Dynamic Nuclear Polarization in Rotating Solids #DNPNMR
From The DNP-NMR Blog:
Electron Decoupling with Dynamic Nuclear Polarization in Rotating Solids #DNPNMR
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Saliba, E.P., et al., Electron Decoupling with Dynamic Nuclear Polarization in Rotating Solids. J Am Chem Soc, 2017. 139(18): p. 6310-6313.
https://www.ncbi.nlm.nih.gov/pubmed/28429936
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08-11-2017 08:52 PM
Characterizing Substrate-Surface Interactions on Alumina-Supported Metal Catalysts by Dynamic Nuclear Polarization-Enhanced Double-Resonance NMR Spectroscopy #DNPNMR
From The DNP-NMR Blog:
Characterizing Substrate-Surface Interactions on Alumina-Supported Metal Catalysts by Dynamic Nuclear Polarization-Enhanced Double-Resonance NMR Spectroscopy #DNPNMR
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Perras, F.A., et al., Characterizing Substrate-Surface Interactions on Alumina-Supported Metal Catalysts by Dynamic Nuclear Polarization-Enhanced Double-Resonance NMR Spectroscopy. J Am Chem Soc, 2017. 139(7): p. 2702-2709.
https://www.ncbi.nlm.nih.gov/pubmed/28112506
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06-13-2017 06:55 AM
A tailored multi-frequency EPR approach to accurately determine the magnetic resonance parameters of dynamic nuclear polarization agents: application to AMUPol #DNPNMR
From The DNP-NMR Blog:
A tailored multi-frequency EPR approach to accurately determine the magnetic resonance parameters of dynamic nuclear polarization agents: application to AMUPol #DNPNMR
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This is a very nice article illustrating the importance of understanding the EPR parameters of a polarizing agent used in DNP-NMR spectroscopy. Here the 9, 95 and 275 GHz EPR spectroscopy is used to characterize AMUPol and predict its performance in high-field DNP.
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06-05-2017 03:59 PM
Correction: Theory of solid effect and cross effect dynamic nuclear polarization with half-integer high-spin metal polarizing agents in rotating solids #DNPNMR
From The DNP-NMR Blog:
Correction: Theory of solid effect and cross effect dynamic nuclear polarization with half-integer high-spin metal polarizing agents in rotating solids #DNPNMR
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Corzilius, B., Correction: Theory of solid effect and cross effect dynamic nuclear polarization with half-integer high-spin metal polarizing agents in rotating solids. Phys. Chem. Chem. Phys., 2016. 18(42): p. 29643-29643.
http://dx.doi.org/10.1039/C6CP90249A
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12-17-2016 07:18 AM
Theory of solid effect and cross effect dynamic nuclear polarization with half-integer high-spin metal polarizing agents in rotating solids #DNPNMR
From The DNP-NMR Blog:
Theory of solid effect and cross effect dynamic nuclear polarization with half-integer high-spin metal polarizing agents in rotating solids #DNPNMR
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Corzilius, B., Theory of solid effect and cross effect dynamic nuclear polarization with half-integer high-spin metal polarizing agents in rotating solids. Phys. Chem. Chem. Phys., 2016. 18(39): p. 27190-27204.
http://dx.doi.org/10.1039/C6CP04621E
Paramagnetic metal ion dopants as polarization agents for DNP NMR spectroscopy in inorganic solids #DNPNMR
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