13C NMR of Liquid Crystals with Different Proton Homonuclear Dipolar Decoupling Methods

Low rf power high resolution 1H–13C–14N separated local field spectroscopy in lyotropic mesophases

“…To restore the 1 H-14 N interaction during evolution period, the 14 N 180°pulse can be applied in the middle of the t 1 period simultaneously with 1 H and 13 C refocusing pulses. Alternatively, if the 1 H 180°pulse is removed the proton magnetization evolves under effect of 1 H-14 N dipole coupling and 1 H chemical shift while couplings to 13 C spins are refocused.…”

“…Pulse sequence was adapted from previously described PDLF experiment which employs BLEW-48 homonuclear decoupling [14]. During encoding period t 1 proton magnetization evolves under the local field of rare 13 C spins.…”

EASY-GOING DUMBO on-spectrometer optimisation of phase modulated homonuclear decoupling sequences in solid-state NMR

“…The first category can be considered as the 'bottom-up' approaches; starting from the theoretical description of the direct dipole-dipole interaction, an averaging scheme is developed. Typical examples are FSLG [2][3][4], PMLG [5][6][7] and RN N=2 n [8] sequences. These methods are effective as well as insightful in understanding the process of averaging homonuclear couplings.…”

13C–1H HSQC experiment of probe molecules aligned in thermotropic liquid crystals: Sensitivity and resolution enhancement in the indirect dimension

“…As far as the 13 C NMR spectra of pure thermotropic liquid crystals is concerned, the studies have been carried out to explore the best homonuclear and heteronuclear decoupling sequence and their merits and demerits have been discussed [16][17][18][19]. However, there is no such systematic study for the probe molecules aligned in the liquid crystalline media, although in a study on the mono and disubstituted fluorinated benzenes aligned in the liquid crystals a two-dimensional proton-detected local field (PDLF) experiment has been carried out [20], using the PMLG sequence to suppress the proton-proton dipolar couplings in the indirect dimension, allowing the evolution of fluorine and proton dipolar couplings.…”