Chemical Shifts of Nitrogen

Nitrogen-15 Magnetic Resonance Spectroscopy. I. Chemical Shifts.

11 Felsenfeld, G., G. Sandeen, and P. von Hippel, these PROCEEDINGS, 50, 644 (1963). 12Bollum, F. J., J. Cell. Comp. Physiol., 62 (Suppi. 1), 61 (1963); Von Borstel, R. C., D. M. Prescott, and F. J. Bollum, J. Cell Biol., 19, 72A (1963). 13 Huang, R. C., and J. Bonner, these PROCEEDINGS, 48, 216 (1962); Allfrey, V. G., V. C. Littau, and A. E. Mirsky, these PROCEEDINGS, 49, 414 (1963). 14 Baxill...

Sensitivity Encoding of Chemical Shifts

INTRODUCTION The chemical shift artifact (CSA) results from temporally undersampling a spatial-spectral distribution along a tilted k-t trajectory. This is illustrated in Fig. 1 for the case of H imaging. Figure 1(a) shows a typical H spatial-spectral distribution, in which the two predominant spectral components are from lipid and water protons. Figure 1(b) shows the k-t space sampling pattern...

H Chemical Shifts in NMR

A New Development of Electronic Descriptors for Simulation of 13C Chemical Shifts

The 13C chemical shifts for a series of compounds which includes carboxylic acids, aldehydes, ethers, ketones and hydrocarbons were simulated by using the parametric techniques. The observed chemical shifts were related to numerically encoded structural parametes called descriptors. Two new electronic descriptors were added to the previous descriptors. Ploting of experimental ver...

2H Isotope Effect on 13C Chemical Shifts of Nitro-Benzo-9-Crown-3

Deuterium substitution on two ortho-substituted-OCH2-fragments in Nitro-Benzo-9-Crown-3 induces low frequency shifts, positive mnDCj, in all 13C NMR resonances which is an indication of the increased shielding in this crown ether. The magnitude of these shifts vary from 15DC7=716 to 54D<...