Articles | Volume 2, issue 1
Research article
17 Jun 2021
Research article |  | 17 Jun 2021

Improved NMR transfer of magnetization from protons to half-integer spin quadrupolar nuclei at moderate and high magic-angle spinning frequencies

Jennifer S. Gómez, Andrew G. M. Rankin, Julien Trébosc, Frédérique Pourpoint, Yu Tsutsumi, Hiroki Nagashima, Olivier Lafon, and Jean-Paul Amoureux

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Cited articles

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Antonijevic, S., Ashbrook, S. E., Biedasek, S., Walton, R. I., Wimperis, S., and Yang, H.: Dynamics on the Microsecond Timescale in Microporous Aluminophosphate AlPO-14 as Evidenced by 27Al MQMAS and STMAS NMR Spectroscopy, J. Am. Chem. Soc., 128, 8054–8062,, 2006. 
Ashbrook, S. E. and Sneddon, S.: New Methods and Applications in Solid-State NMR Spectroscopy of Quadrupolar Nuclei, J. Am. Chem. Soc., 136, 15440–15456,, 2014. 
Ashbrook, S. E. and Wimperis, S.: Spin-locking of half-integer quadrupolar nuclei in nuclear magnetic resonance of solids: Second-order quadrupolar and resonance offset effects, J. Chem. Phys., 131, 194509,, 2009. 
Ashbrook, S. E., Cutajar, M., Pickard, C. J., Walton, R. I., and Wimperis, S.: Structure and NMR assignment in calcined and as-synthesized forms of AlPO-14: a combined study by first-principles calculations and high-resolution 27Al–31PMAS NMR correlation, Phys. Chem. Chem. Phys., 10, 5754–5764,, 2008. 
Short summary
The transfer of polarization from protons to half-integer spin quadrupolar nuclei provides insights into the proximities between these nuclei. We analyse the best transfers at 20 and 62 kHz MAS obtained with RINEPT and PRESTO recouplings using adiabatic or composite π pulses. The 1H magnetization is best transferred using PRESTO-R22,7,2 (180) or -R16,6,7 (270,90) at 20 or 62 kHz MAS, respectively, and RINEPT-SR4,2,1 (270,90).