Analyses of the complex proton NMR spectra: Determination of anisotropic proton chemical shifts of oriented molecules by a two dimensional experiment

Supercycled homonuclear dipolar decoupling sequences in solid-state NMR

“…Among the various multiple-pulse schemes that are normally employed, those that have been shown to perform well at MAS frequencies of 10-25 kHz are the frequency-switched Lee-Goldburg (FSLG) [3,4], the phase-modulated Lee-Goldburg (PMLG) [5,6], and the decoupling using mind boggling optimisation (DUMBO) [7] sequences. FSLG and PMLG are the sequences of choice in most two-dimensional (2D) experiments requiring high-resolution 1 H spectra, for example, in 2D heterocorrelation spectroscopy [8][9][10][11][12] and 2D double quantum-single quantum correlation spectroscopy [13]. Both double-quantum and triple-quantum 1 H spectroscopy have also been reported with the use of DUMBO [14][15][16].…”

Visualization of enantiomers and determination of homo- and hetero-nuclear residual dipolar and scalar couplings: The natural abundant 13C edited J/D-resolved NMR techniques

“…The shifting of resonance positions due to chemical shift anisotropy is clearly evident from Figure 4D and E. Thus the significant advantage of the experiment is in the measurement of the values of anisotropic chemical shifts in addition to the values of chemical shift difference between the enantiomers. This is analogous to the reported method where LG decoupling is employed in F 1 dimension to derive anisotropic chemical shift information for molecules aligned in thermotropic liquid crystal [40]. Yet again chiral discrimination could be observed in F 2 -dimension when there is a measurable 1 H chemical shift difference between the enantiomers.…”

Hamiltonian Characterization for Dipolar Coupled Spin Systems

“…The chemical shifts (up to a scaling factor) were further verified by a 2D experiment using Lee Goldburg decoupling technique [49,50]. In this technique a radio frequency off resonance is applied according to ∆LG = √ 2…”