✍ Scribed by Mark Strohmeier; D.W. Alderman; David M. Grant
No coin nor oath required. For personal study only.
The effect of dipolar coupling to 14 N on 13 C FIREMAT ( five π replicated magic angle turning) experiments is investigated. A method is developed for fitting the 13 C FIREMAT FID employing the full theory to extract the 13 C-14 N dipolar and 13 C chemical shift tensor information. The analysis requires prior knowledge of the electric field gradient (EFG) tensor at the 14 N nucleus. In order to validate the method the analysis is done for the amino acids α-glycine, γ-glycine, l-alanine, l-asparagine, and l-histidine on FIREMAT FIDs recorded at 13 C frequencies of 50 and 100 MHz. The dipolar and chemical shift data obtained with this analysis are in very good agreement with the previous single-crystal 13 C NMR results and neutron diffraction data on α-glycine, l-alanine, and lasparagine. The values for γ-glycine and l-histidine obtained with this new method are reported for the first time. The uncertainties in the EFG tensor on the resultant 13 C chemical shift and dipolar tensor values are assessed.
📜 SIMILAR VOLUMES
## Abstract The proton spectra of phthalonitrile, including ^13^C‐ and ^15^N‐satellites at natural abundance in isotropic and oriented solvents, have been analysed. The entire __r__~α~‐structure is derived from the direct couplings. The AISEFT method has been used for obtaining the pure satellite i
## Abstract As revealed by single crystal XRD compounds (II) and (VI) crystallize in the triclinic space group P$\bar 1$ with Z = 2, (IV) in the monoclinic space group P2~1~/m with Z = 4, and (V) in the monoclinic space group P2~1~/n with Z = 4.