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• W2068762270 abstract "We describe a method for measuring magnetic dipole-dipole interactions, and hence distances, between pairs of like nuclear spins in a many-spin system under magic-angle spinning (MAS). This method employs a homonuclear dipolar recoupling sequence that creates an average dipole-dipole coupling Hamiltonian under MAS with full zero-quantum symmetry, including both secular and flip-flop terms. Flip-flop terms are then attenuated by inserting rotor-synchronized periods of chemical shift evolution between recoupling blocks, leaving an effective Hamiltonian that contains only secular terms to a good approximation. Couplings between specific pairs of nuclear spins can then be selected with frequency-selective π pulses. We demonstrate this technique, which we call zero-quantum shift evolution assisted homonuclear recoupling, in a series of one-dimensional and two-dimensional C13 NMR experiments at 17.6 T and 40.00 kHz MAS frequency on uniformly C13-labeled L-threonine powder and on the helix-forming peptide MB(i+4)EK, synthesized with a pair of uniformly C13-labeled L-alanine residues. Experimental demonstrations include measurements of distances between C13 sites that are separated by three bonds, placing quantitative constraints on both sidechain and backbone torsion angles in polypeptides." @default.
• W2068762270 created "2016-06-24" @default.
• W2068762270 creator A5016172549 @default.
• W2068762270 creator A5065785217 @default.
• W2068762270 date "2009-07-22" @default.
• W2068762270 modified "2023-09-26" @default.
• W2068762270 title "Zero-quantum frequency-selective recoupling of homonuclear dipole-dipole interactions in solid state nuclear magnetic resonance" @default.
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• W2068762270 doi "https://doi.org/10.1063/1.3176874" @default.
• W2068762270 hasPubMedCentralId "https://www.ncbi.nlm.nih.gov/pmc/articles/2728366" @default.
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• W2068762270 hasPublicationYear "2009" @default.
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