6533b7d7fe1ef96bd1268381
RESEARCH PRODUCT
Low-temperature methyl group dynamics of hexamethylbenzene in crystalline and glassy matrices as studied by 2H NMR
Ernst RösslerK. BörnerHans-martin ViethGregor Diezemannsubject
ChemistryIntermolecular forceRelaxation (NMR)Spin–lattice relaxationGeneral Physics and AstronomyNuclear magnetic resonance spectroscopyAmorphous solidchemistry.chemical_compoundNuclear magnetic resonanceProton NMRHexamethylbenzenePhysical chemistryPhysical and Theoretical ChemistryMethyl groupdescription
Abstract 2 H NMR spectra of hexamethylbenzene (HMB) in protonated crystalline and amorphous matrices at low temperatures are presented. All spectra reveal lineshape changes which can be attributed to methyl group tunnelling. Compared to neat HMB, a drastic increase of the tunnelling frequency is found for all systems. This indicates that the hindering potential originates predominantly from intermolecular forces. We studied the temperature dependence of these spectra and the spin-lattice relaxation in order to exclude a distribution of motional correlation times describing a thermally activated process. In addition, we find a distortion of the methyl tetrahedron.
| year | journal | country | edition | language |
|---|---|---|---|---|
| 1991-07-01 | Chemical Physics Letters |