TY - JOUR
T1 - Résonance magnétique nucléaire du noyau 14N par Transformée de Fourier
AU - Kintzinger, Jean‐Pierre
AU - Lehn, Jean‐Marie
N1 - Publication details (e.g. title, author(s), publication statuses and dates) are captured on an “AS IS” and “AS AVAILABLE” basis at the time of record harvesting from the data source. Suggestions for further amendments or supplementary information can be sent to [email protected].
PY - 1975/4/23
Y1 - 1975/4/23
N2 - 14N‐NMR. measurements using the Fourier Transform technique are presented and compared to C. W. experiments. The F. T. technique is especially advantageous for relaxation time measurements. However, since 14N‐nuclei may have widely different relaxation times, it is often not possible to have optimal gain in sensitivity (as compared to C. W. measurements) in a single F. T. experiment for different 14N‐nuclei contained in the same sample. Different experiments have to be performed, optimizing the spectrometer parameters for each 14N‐resonance of appreciably different linewidth. The technique is applied to three different problems. 14N‐relaxation in symmetrical ammonium salts is shown to arise from reorientation of the water dipoles. The use of a double spin‐probe, 13C‐14N, allows the determination of the electric field gradients in cyclic ammonium salts. The electronic distribution is especially distorted from tetrahedral symmetry in the highly strained N, N‐dimethyl‐aziridinium cation. Finally, electric and dynamic effects in ion pairing may be studied as shown on the case of tetrabutylammonium iodide in water and in benzene. Copyright © 1975 Verlag GmbH & Co. KGaA, Weinheim
AB - 14N‐NMR. measurements using the Fourier Transform technique are presented and compared to C. W. experiments. The F. T. technique is especially advantageous for relaxation time measurements. However, since 14N‐nuclei may have widely different relaxation times, it is often not possible to have optimal gain in sensitivity (as compared to C. W. measurements) in a single F. T. experiment for different 14N‐nuclei contained in the same sample. Different experiments have to be performed, optimizing the spectrometer parameters for each 14N‐resonance of appreciably different linewidth. The technique is applied to three different problems. 14N‐relaxation in symmetrical ammonium salts is shown to arise from reorientation of the water dipoles. The use of a double spin‐probe, 13C‐14N, allows the determination of the electric field gradients in cyclic ammonium salts. The electronic distribution is especially distorted from tetrahedral symmetry in the highly strained N, N‐dimethyl‐aziridinium cation. Finally, electric and dynamic effects in ion pairing may be studied as shown on the case of tetrabutylammonium iodide in water and in benzene. Copyright © 1975 Verlag GmbH & Co. KGaA, Weinheim
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U2 - 10.1002/hlca.19750580327
DO - 10.1002/hlca.19750580327
M3 - RGC 21 - Publication in refereed journal
SN - 0018-019X
VL - 58
SP - 905
EP - 917
JO - Helvetica Chimica Acta
JF - Helvetica Chimica Acta
IS - 3
ER -