Abstract
A solid-state NMR experiment for identifying nitrogen-bonded carbons with good efficiency at standard magic-angle-spinning (MAS) frequencies is presented. In the center of a sequence of 180° pulses recoupling the 14 N – 13 C dipolar interaction, the 14 N coherences are saturated by a train of small-angle 14 N pulses for 1–2 ms. This saturation-pulse induced dipolar exchange with recoupling (SPIDER) provides efficient partial dephasing of 13 C bonded to 14 N at 5-kHz MAS and low radio-frequency strengths where REAPDOR and TRAPDOR are inefficient. SPIDER is demonstrated on an amide group with a 14 N quadrupole-coupling constant of −3.1 MHz, on a benzamide, and on chitin.
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