Compensated XY8-DRAMA Pulse Sequence for Homonuclear Dephasing

Internuclear Distance Determination of S=1, I=1/2 Spin Pairs Using REAPDOR NMR

“…[4] represents the dipolar interaction. The dipolar splitting, d(t), is given by (44) [8] where ω D = 2π D is the dipolar coupling constant (see Eq. [2]) and θ D is the angle between the internuclear vector and the magnetic field.…”

A MAS NMR Method for Measuring 13C−17O Distances

“…These experiments include rotational resonance NMR, which recovers the homonuclear dipolar interaction by setting the spinning frequency to a multiple of the difference between the isotropic chemical shifts of the two coupled spins. Other experiments, which use rotor-synchronized pulse trains, include C7, DICSY, DRAMA, , DRAWS, REDOR, RFDR, MELODRAMA, DEAR, and TEDOR . The measurement of distances between a spin- 1 / 2 nucleus and a quadrupolar nucleus (e.g., a 13 C− 17 O spin pair), however, is a more difficult problem even though there has been some recent progress in this area with the REAPDOR, , REDOR, , and TRAPDOR , experiments.…”

Distance Measurements by Dipolar Recoupling Two-Dimensional Solid-State NMR

“…In dipolar recoupling pulse sequences, radio frequency pulses are applied during “magic angle spinning” (MAS) to avoid averaging the nuclear dipolar interaction, while simultaneously effecting near complete reduction of the chemical shift anisotropy (CSA). Numerous dipolar recoupling techniques have been reported in the literature, − and several have been incorporated into two-dimensional pulse sequences for spectral assignment. ,,− Quantitative distance measurements using these techniques have generally been limited to a single spectral dimension in which a single distance between two rare spins on a sparsely labeled compound is measured. − Herein, we introduce a two-dimensional (2D) dipolar recoupling pulse sequence, 2D DRAWS, and demonstrate its applications for both spectral assignment and quantitative distance measurement. 2D DRAWS is a fully transverse experiment based on the one-dimensional technique, dipolar recoupling with a windowless sequence (DRAWS) …”