| | 1 | Author
| U. Schlenz, A. Dölle, H. G. Hertz | Requires cookie* | | | Title
| M  | | | | Abstract
| o le c u la r M o tio n in L iq u id s : T h e P a r ti a ll y R ig id M o le c u le 1,2 ,3 » 4 -T e tr a h y d r o -5 ,6 -D im e th y l-l ,4 -M e th a n o n a p h th a le n e . T e m p e r a tu r e D e p e n d e n c e o f 13C M a g n e tic R e la x a tio n a n d C o r r e la tio n T im e s Dedicated to Professor W . Müller-Warmuth on occasion of his 65 th birthday For the hydrocarbon l,2,3,4-tetrahydro-5,6-dimethyl-l,4-methanonaphthalene (5,6-Me2-THMN) 13C longitudinal relaxation times and NOE factors were measured over a wide temperature range at frequencies of 22.63 and 100.62 MHz. Additionally, 13C transversal relaxation times were mea sured at 100.62 MHz. The relaxation data show that the dispersion region is already reached at moderate temperatures. The experimental data were modeled by the combination of the Vogel-Fulcher-Tammann ansatz and a scaling of the dipolar coupling constant with a factor of 0.70. From the fit of the data also activation parameters of the rotational motion of the molecules were obtained. Although the molecules of 5,6-Me2-THMN have a rigid structure (except the two inter nally rotating methyl groups), the model of the rotational diffusion of rigid bodies does not satisfactorily describe the relaxation data. | | | |
Reference
| Z. Naturforsch. 50a, 631—642 (1995); received December 16 1994 | | | |
Published
| 1995 | | | |
Keywords
| Liquids, Rotational Diffusion, Rotational Correlation Times, 13C Nuclear Magnetic Resonance, Relaxation | | | |
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