## Abstract Dipole‐dipole relaxation via non‐bonded protons is an important relaxation mechanism for^119^Sn in tri‐__n__‐propyltin and tri‐__n__ ‐butyltin compounds. This causes a negative nuclear Overhauser effect, arising from the negative magnetogyric ratio, which in some cases nulls the signal.
Carbon-13 spin-lattice relaxation times and nuclear overhauser enhancements in some simple fluorocarbons
✍ Scribed by Geoffrey E. Hawkes; Raymond J. Abraham
- Publisher
- John Wiley and Sons
- Year
- 1974
- Tongue
- English
- Weight
- 351 KB
- Volume
- 6
- Category
- Article
- ISSN
- 0749-1581
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✦ Synopsis
Abstract
Carbon‐13 spin‐lattice relaxation times (T~1~) and ^13^C‐{^19^F} nuclear Overhauser enhancement (NOE) factors have been measured for some simple fluorocarbons by pulse‐Fourier transform methods—‘progressive saturation’ and ‘dynamic Overhauser enhancement’. The NOE factors are shown to be large for ^13^C with directly bonded fluorines, and the values for T~1~ and the NOE factors are similar to those obtained elsewhere on the corresponding hydrocarbons.
📜 SIMILAR VOLUMES
## Measurements of the enhancement, by various electrolytes, of the spin-lattice relaxation time of carbon-13 at different locations in a number of amino acids are reported. Spin-lattice relaxation times T 1 of all the carbons in amino acids generally tend to decrease with increase in the concentr
## Abstract A pulse sequence is presented which allows measurement of short __T__~1~ values (< 1 s) in solids, avoiding probe damage by the use of saturating sequences of 90° pulses. The use of the sequence is illustrated for a cross‐linked polymeric system which contains composite peaks having bot