Park, Heeyong, Boran Uluca-Yazgi, Saskia Heumann, Robert Schlögl, Josef Granwehr, Henrike Heise, and P. Philipp M. Schleker. “Heteronuclear Cross-Relaxation Effect Modulated by the Dynamics of N-Functional Groups in the Solid State under 15N DP-MAS DNP.” Journal of Magnetic Resonance 312 (March 2020): 106688.
In a typical magic-angle spinning (MAS) dynamic nuclear polarization (DNP) nuclear magnetic resonance (NMR) experiment, several mechanisms are simultaneously involved when transferring much larger polarization of electron spins to NMR active nuclei of interest. Recently, specific cross-relaxation enhancement by active motions under DNP (SCREAM-DNP) [Daube et al. JACS 2016] has been reported as one of these mechanisms. Thereby 13C enhancement with inverted sign was observed in a direct polarization (DP) MAS DNP experiment, caused by reorientation dynamics of methyl that was not frozen out at 100 K. Here, we report on the spontaneous polarization transfer from hyperpolarized 1H to both primary amine and ammonium nitrogens, resulting in an additional positive signal enhancement in the 15N NMR spectra during 15N DP-MAS DNP. The cross-relaxation induced signal enhancement (CRE) for 15N is of opposite sign compared to that observed for 13C due to the negative sign of the gyromagnetic ratio of 15N. The influence on CRE efficiency caused by variation of the radical solution composition and by temperature was also investigated.
Methyl dynamics in amino acids modulate heteronuclear cross relaxation in the solid state under MAS DNP #DNPNMR
From The DNP-NMR Blog:
Methyl dynamics in amino acids modulate heteronuclear cross relaxation in the solid state under MAS DNP #DNPNMR
Aladin, Victoria, and Björn Corzilius. “Methyl Dynamics in Amino Acids Modulate Heteronuclear Cross Relaxation in the Solid State under MAS DNP.” Solid State Nuclear Magnetic Resonance 99 (July 2019): 27–35.
https://doi.org/10.1016/j.ssnmr.2019.02.004.
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05-06-2019 04:47 PM
Bis-Gadolinium Complexes for Solid Effect and Cross Effect Dynamic Nuclear Polarization #DNPNMR
From The DNP-NMR Blog:
Bis-Gadolinium Complexes for Solid Effect and Cross Effect Dynamic Nuclear Polarization #DNPNMR
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Kaushik, M., et al., Bis-Gadolinium Complexes for Solid Effect and Cross Effect Dynamic Nuclear Polarization. Angew Chem Int Ed Engl, 2017. 56(15): p. 4295-4299.
https://www.ncbi.nlm.nih.gov/pubmed/28319293
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07-15-2017 05:05 PM
Heteronuclear Cross-Relaxation under Solid-State Dynamic Nuclear Polarization #DNPNMR
From The DNP-NMR Blog:
Heteronuclear Cross-Relaxation under Solid-State Dynamic Nuclear Polarization #DNPNMR
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Daube, D., et al., Heteronuclear Cross-Relaxation under Solid-State Dynamic Nuclear Polarization. J. Am. Chem. Soc., 2016. 138(51): p. 16572-16575.
http://dx.doi.org/10.1021/jacs.6b08683
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03-07-2017 08:21 AM
Spatial distribution of organic functional groups supported on mesoporous silica nanoparticles: a study by conventional and DNP-enhanced 29Si solid-state NMR #DNPNMR
From The DNP-NMR Blog:
Spatial distribution of organic functional groups supported on mesoporous silica nanoparticles: a study by conventional and DNP-enhanced 29Si solid-state NMR #DNPNMR
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Kobayashi, T., et al., Spatial distribution of organic functional groups supported on mesoporous silica nanoparticles: a study by conventional and DNP-enhanced 29Si solid-state NMR. Phys. Chem. Chem. Phys., 2017. 19(3): p. 1781-1789.
https://www.ncbi.nlm.nih.gov/pubmed/28058422
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03-01-2017 05:04 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
The interplay between the solid effect and the cross effect mechanisms in solid state 13C DNP at 95 GHz using trityl radicals
From The DNP-NMR Blog:
The interplay between the solid effect and the cross effect mechanisms in solid state 13C DNP at 95 GHz using trityl radicals
Banerjee, D., et al., The interplay between the solid effect and the cross effect mechanisms in solid state 13C DNP at 95 GHz using trityl radicals. J. Magn. Reson., 2013. 230(0): p. 212-219.
http://dx.doi.org/10.1016/j.jmr.2013.02.010
Heteronuclear cross-relaxation effect modulated by the dynamics of N-functional groups in the solid state under 15N DP-MAS DNP #DNPNMR
Linear Mode
