Levien, M., M. Hiller, I. Tkach, M. Bennati, and T. Orlando. “Nitroxide Derivatives for Dynamic Nuclear Polarization in Liquids: The Role of Rotational Diffusion.” The Journal of Physical Chemistry Letters 11, no. 5 (March 5, 2020): 1629–35. https://doi.org/10.1021/acs.jpclett.0c00270.
Polarization transfer efficiency in liquid-state dynamic nuclear polarization (DNP) depends on the interaction between polarizing agents (PAs) and target nuclei modulated by molecular motions. We show how translational and rotational diffusion differently affect the DNP efficiency. These contributions were disentangled by measuring 1HDNP enhancements of toluene and chloroform doped with nitroxide derivatives at 0.34 T as a function of either the temperature or the size of the PA. The results were employed to analyze 13C-DNP data at higher fields, where the polarization transfer is also driven by the Fermi contact interaction. In this case, bulky nitroxide PAs perform better than the small TEMPONE radical due to structural fluctuations of the ring conformation. These findings will help in designing PAs with features specifically optimized for liquid-state DNP at various magnetic fields.
Dynamic Nuclear Polarization as Kinetically Constrained Diffusion #DNPNMR
From The DNP-NMR Blog:
Dynamic Nuclear Polarization as Kinetically Constrained Diffusion #DNPNMR
Karabanov, A., et al., Dynamic Nuclear Polarization as Kinetically Constrained Diffusion. Phys. Rev. Lett., 2015. 115(2): p. 020404.
https://www.ncbi.nlm.nih.gov/pubmed/26207453
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05-09-2018 03:14 PM
Photo-induced radical polarization and liquid-state dynamic nuclear polarization using fullerene nitroxide derivatives #DNPNMR
From The DNP-NMR Blog:
Photo-induced radical polarization and liquid-state dynamic nuclear polarization using fullerene nitroxide derivatives #DNPNMR
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Liu, G., et al., Photo-induced radical polarization and liquid-state dynamic nuclear polarization using fullerene nitroxide derivatives. Phys. Chem. Chem. Phys., 2017. 19(47): p. 31823-31829.
https://www.ncbi.nlm.nih.gov/pubmed/29171613
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02-14-2018 04:47 PM
Spectral diffusion and dynamic nuclear polarization: Beyond the high temperature approximation #DNPNMR
From The DNP-NMR Blog:
Spectral diffusion and dynamic nuclear polarization: Beyond the high temperature approximation #DNPNMR
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Wenckebach, W.T., Spectral diffusion and dynamic nuclear polarization: Beyond the high temperature approximation. J. Magn. Reson., 2017. 284(Supplement C): p. 104-114.
http://www.sciencedirect.com/science/article/pii/S1090780717302409
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01-15-2018 09:29 PM
Photo-induced radical polarization and liquid-state dynamic nuclear polarization with fullerene nitroxide derivatives
From The DNP-NMR Blog:
Photo-induced radical polarization and liquid-state dynamic nuclear polarization with fullerene nitroxide derivatives
DNP without microwave radiation? A very interesting approach.
Liu, G., et al., Photo-induced radical polarization and liquid-state dynamic nuclear polarization with fullerene nitroxide derivatives. Phys. Chem. Chem. Phys., 2017.
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12-04-2017 03:35 PM
13C Dynamic Nuclear Polarization Using Derivatives of TEMPO Free Radical #DNPNMR
From The DNP-NMR Blog:
13C Dynamic Nuclear Polarization Using Derivatives of TEMPO Free Radical #DNPNMR
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Niedbalski, P., et al., 13C Dynamic Nuclear Polarization Using Derivatives of TEMPO Free Radical. Appl. Magn. Reson., 2017. 48(9): p. 933-942.
https://doi.org/10.1007/s00723-017-0916-7
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11-06-2017 05:23 PM
Effect of electron spectral diffusion on static dynamic nuclear polarization at 7 Tesla #DNPNMR
From The DNP-NMR Blog:
Effect of electron spectral diffusion on static dynamic nuclear polarization at 7 Tesla #DNPNMR
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Leavesley, A., et al., Effect of electron spectral diffusion on static dynamic nuclear polarization at 7 Tesla. Phys. Chem. Chem. Phys., 2017. 19(5): p. 3596-3605.
https://www.ncbi.nlm.nih.gov/pubmed/28094364
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06-02-2017 08:33 PM
19F Dynamic Nuclear Polarization and SEM in Suspensions Consisting of Fluorobenzene Derivatives and Asphaltene Extracted from MC-800 Liquid Asphalt #DNPNMR
From The DNP-NMR Blog:
19F Dynamic Nuclear Polarization and SEM in Suspensions Consisting of Fluorobenzene Derivatives and Asphaltene Extracted from MC-800 Liquid Asphalt #DNPNMR
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Kirimli, H.E. and H. Ovalioglu, 19F Dynamic Nuclear Polarization and SEM in Suspensions Consisting of Fluorobenzene Derivatives and Asphaltene Extracted from MC-800 Liquid Asphalt. Journal of Dispersion Science and Technology, 2014. 35(2): p. 255-264.
https://doi.org/10.1080/01932691.2013.767208
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01-09-2017 04:21 PM
A high saturation factor in Overhauser DNP with nitroxide derivatives: the role of (14)N nuclear spin relaxation
From The DNP-NMR Blog:
A high saturation factor in Overhauser DNP with nitroxide derivatives: the role of (14)N nuclear spin relaxation
Enkin N, Liu G, Gimenez-Lopez Mdel C, Porfyrakis K, Tkach I, Bennati M. A high saturation factor in Overhauser DNP with nitroxide derivatives: the role of (14)N nuclear spin relaxation. Phys Chem Chem Phys. 2015;17(17):11144-9.
http://www.ncbi.nlm.nih.gov/pubmed/25855020
Nitroxide Derivatives for Dynamic Nuclear Polarization in Liquids: The Role of Rotational Diffusion #DNPNMR
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