NMR Relaxation Study of Liquid CCl3F. Reorientational and Angular Momentum Correlation Times and Rotational Diffusion

Autor:	A. A. Maryott, K. T. Gillen, D. C. Douglass, M. S. Malmberg
Rok vydání:	1972
Předmět:	Coupling constant Angular momentum Condensed matter physics Chemistry Relaxation (NMR) Intermolecular force General Physics and Astronomy Rotational diffusion Field strength Physical and Theoretical Chemistry Atmospheric temperature range Atomic physics Anisotropy
Zdroj:	The Journal of Chemical Physics. 57:5170-5179
ISSN:	1089-7690 0021-9606
DOI:	10.1063/1.1678207
Popis:	Using pulsed NMR techniques, values of the self‐diffusion constant Ds and the 19F spin‐lattice and rotating frame relaxation times, T1F and T1ρF have been obtained for CCl3F over its entire liquid range. (∼150–450°K). The dependence of T1ρF on the rotating field strength ω1 has been used to derive temperature‐dependent values of the 35Cl spin‐lattice relaxation time T1Cl and the chlorine to fluorine spin‐spin coupling constant J19 F–35Cl(=11.9± 0.4 Hz, independent of temperature). Except at low temperatures where the intermolecular dipole‐dipole relaxation mechanism is important, T1F is dominated by the spin‐rotation interaction (T1F)sr. Using Ds data to separate the dipole‐dipole contribution from T1srF allows us to estimate values of the angular momentum correlation time τJ over a 300° temperature range. Over the same temperature range, values of T1Cl give the correlation times for molecular reorientation τθ,2. Although possible anisotropy in molecular motion and in the spin‐rotation interaction preclud...
Databáze:	OpenAIRE
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