Comparison of methods for 14N-1H recoupling in 14N-1H HMQC MAS NMR.

[Display omitted] • Various recoupling techniques for probing 14N-1H interactions are compared. • Similarity of phase-inverted rotary-resonance recoupling and the symmetry based SR4 1 2 method is explored. • Offset dependence of TRAPDOR for application to nitrogen sites with different quadrupolar coupling constants. 1H-detected 14N heteronuclear multiple-quantum coherence (HMQC) magic-angle-spinning (MAS) NMR experiments performed at fast magic-angle spinning (≥50 kHz) are finding increasing application, e.g., to pharmaceuticals. Of importance to the efficacy of these techniques is the recoupling technique applied to reintroduce the 1H-14N dipolar coupling. In this paper, we compare, by experiment and 2-spin density matrix simulations, two classes of recoupling scheme: first, those based on n = 2 rotary resonance, namely R3 and spin-polarisation inversion SPI-R3, and the symmetry based SR4 1 2 method and, second, the TRAPDOR method. Both classes require optimisation depending on the magnitude of the quadrupolar interaction, and thus there is a compromise choice for samples with more than one nitrogen site, as is the case for the studied dipeptide β-AspAla that contains two nitrogen sites with a small and large quadrupolar coupling constant. Considering this, we observe better sensitivity for the TRAPDOR method, though noting the marked sensitivity of TRAPDOR to the 14N transmitter offset, with both SPI-R3 and SR4 1 2 giving similar recoupling performance. [ABSTRACT FROM AUTHOR]