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| Titel: |
Nuclear relaxation and molecular reorientation of liquid diazabenzenes |
| Auteur: |
Pedersen, E. Jonas Vold, Regitze R. Vold, Robert L. |
| Verschenen in: |
Molecular physics |
| Paginering: | Jaargang 35 (1978) nr. 4 pagina's 997-1015 |
| Jaar: |
1978-04 |
| Inhoud: |
Nuclear relaxation rates of 13C and 14N have been measured as a function of temperature for neat liquid pyrimidine and pyridazine. Nuclear Overhauser enhancements, also measured as a function of temperature, were used to separate dipolar and spin rotational contributions to 13C relaxation. 13CH dipolar relaxation rates were combined with quadrupolar 14N relaxation rates to determine rotational correlation times for motion about each principal molecular axis. The accuracy of the results is limited primarily by uncertainty in liquid-state values of the 14N quadrupole coupling parameters. The temperature and viscosity dependence of the rotational correlation times is compared with those of other six-membered aromatic molecules, and is discussed in terms of the relative influence of molecular shape, attractive forces of dipolar origin and self association. 2H and 14N relaxation rates and the 2H quadrupole coupling constant for pyrazine are also reported here, but the motion of this molecule could not be analysed. |
| Uitgever: |
Taylor & Francis |
| Bronbestand: |
Elektronische Wetenschappelijke Tijdschriften |
Details van artikel 11 van 20 gevonden artikelen
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