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od 2020-09-20

Title: Magnetic relaxation under fast internal rotation in liquid part II). A variable temperature NMR study using 13C spin-lattice relaxation time measurements in liquid mesitylene

Source: Berichte der Bunsengesellschaft fur Physikalische Chemie

Year : 1993

Abstract:

The 13C nuclear spin-lattice relaxation times of ring and methyl carbons in liquid mesitylene (1,3,5-trimethyl-benzene, 1,3,5-TMB) have been measured as a function of temperature. The results have been analyzed in terms of two relaxation mechanisms: intramolecular dipole-dipole coupling and spin-rotation interaction. In order to separate these contributions, also the nuclear Overhauser enhancement factors have been studied. The results have been analyzed in terms of the theory of Gordon and Langevin models for internal motion of methyl groups with a low barrier to internal rotation and are in good agreement with predictions of both theories.

DOI: 10.1002/bbpc.19930970912   (Pobrane:  aktualizowanie)