Two-dimensional second-order quadrupolar exchange powder spectra for nuclei with half-integer spins. Calculations and an experimental example using oxygen NMR

Anion dynamics and motional decoupling in a glycerol–choline chloride deep eutectic solvent studied by one- and two-dimensional 35Cl NMR

“…This technique has been demonstrated for a range of halfinteger quadrupolar nuclei including 11 B, 17 O, and 87 Rb. 49,79,80 For 35 Cl, obviously only 2D spectroscopy in the absence of an external static magnetic field has been performed, so far. 81–83…”

Solid-State 17O NMR Study of Carboxylic Acid Dimers: Simultaneously Accessing Spectral Properties of Low- and High-Energy Tautomers

“…As a result, NMR observables such as 17 O chemical shift and QC tensors will be the averaged values between the two possible tautomers A and B. This situation is distinctly different from other cases where solid-state 17 O NMR was used to extract energetic information about dynamic processes. − Following a simple “Arrhenius approach” developed in previous 1 H and 13 C NMR studies, ,, we can treat the averaging effect on the 17 O isotropic chemical shifts as a simple “thermal averaging” between the two tautomers where In the above equation, Δ E refers to the energy asymmetry of the double-well potential curve between tautomers A and B. A schematic diagram showing this averaging is depicted in Figure .…”

Quadrupolar transients, cosine correlation functions, and two-dimensional exchange spectra of non-selectively excited spin-3/2 nuclei: A 7 Li NMR study of the superionic conductor lithium indium phosphate

“…Only recently, was this experimental approach adapted to non-rotating powder samples featuring selectively excitable nuclei with half-integer spin that are characterized by very large (> 1 MHz) second-order quadrupolar interactions [69]. The present work now demonstrates how first-order quadrupole anisotropies can be exploited for non-selectively excitable spin-3/2 nuclei to study two-dimensional exchange spectra in static powders that reveal translational ionic motion.…”