An NMR study on dynamics of AX(3) spin system as illustrated by methyl group in 2,6-dichlorotoluene

Citation
Jr. Rho et al., An NMR study on dynamics of AX(3) spin system as illustrated by methyl group in 2,6-dichlorotoluene, B KOR CHEM, 19(12), 1998, pp. 1326-1333
Citations number
25
Language
INGLESE
art.tipo
Article
Categorie Soggetti
Chemistry
Journal title
BULLETIN OF THE KOREAN CHEMICAL SOCIETY
ISSN journal
0253-2964 → ACNP
Volume
19
Issue
12
Year of publication
1998
Pages
1326 - 1333
Database
ISI
SICI code
0253-2964(199812)19:12<1326:ANSODO>2.0.ZU;2-7
Abstract
The study of coupled relaxation for methyl spin system in 2,6-dichlorotolue ne was performed on the basis of the magnetization mode formalism. Using fi ve initial perturbing pulse sequences, eight experimental data sets were ob tained, which were fitted with theoretical expressions with nine spectral d ensity parameters. The same experiment was carried out at both 50.3 MHz and 125.6 MHz in carbon frequency. The measured spectral densities at both fie lds are similar in the exception of that related with carbon random field t erm. Furthermore, from the dipolar spectral density, the physical values ma y be extracted depending on the model of molecular reorientation. For examp le, it was assumed that the molecular framework undergoes asymmetric diffus ive rotational process and methyl group reorients by either diffusive rotat ion about its symmetry axis or jump among internal rotational potential min ima.