The spin-lattice relaxation of lSN nuclei in organic compounds is caused by the dipole-dipole interaction with protons at lower temperatures and by the spin-rotation interaction at higher temperatures. The relaxation times are very long k most compounds. ## 1. lnboduction Even though the 15N NMR s
Spin—lattice relaxation of 13C nuclei in organic liquids
✍ Scribed by A. Olivson; E. Lippmaa
- Publisher
- Elsevier Science
- Year
- 1971
- Tongue
- English
- Weight
- 479 KB
- Volume
- 11
- Category
- Article
- ISSN
- 0009-2614
No coin nor oath required. For personal study only.
✦ Synopsis
Spin-lattice
relaxation times of t3C nuclei in organic compounds have been measured in a wide temperature range. The dipole-dipole interaction with protons is predominant at lower temperatures and the spin-rotation interaction at higher temperatures. Both the measured relaxation times and r3C chemicaJ shifts lead to reasonable values for the t3C spin-rotation coupling constants.
📜 SIMILAR VOLUMES
The spin-lnttice rclaxltion of I% nuclei in inorganic ions is governed by inter-nnd intramoleculnl dipole-dipole and shift anisotropy intcrnctions at lowzr tcmpcrntures and by the spin-rotation interaction at higher temperatures. The mensured relnxttion rntes lcsd to rcasonablc rnlues for the 15~ s
The spin-lattice relaxation of ten polychloroalkanes (ethanes to pentanes) have been studied both neat and in a 50% solution in CDC13. The Tl values for the CH,, CH,Cl and CHCl, carbons decrease with increasing molecular weight in accordance with a dipolar-dominated mechanism, whereas those of the C