Proton Assisted Insensitive Nuclei Cross Polarization

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Abstract

This Communication presents a solid-state NMR 15N−13C polarization transfer scheme applicable at high B0 and high MAS frequencies, requiring moderate rf powers and mixing time (1−6 ms). The sequence, PAIN-CP, involves the abundant nearby protons in the heteronuclear recoupling dynamics and provides a new tool for obtaining long distance 15N−13C contacts. It should be of major interest for biomolecular structural studies.

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