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od 2020-09-20

Title: Anisotropy of rotational diffusion in liquid alpha,omega-dichloroalkanes

Source: Berichte der Bunsengesellschaft fur Physikalische Chemie

Year : 1993

Abstract:

From the analysis of 1H and 13C spin-lattice relaxation times and self-diffusion coefficients measured for α,ω-dichloropentane, -hexane and -octane, the rotational diffusion coefficients of the prolate ellipsoid type molecules treated as rigid symmetrical tops are derived. The effect of slow internal motions on the predominant dipolar relaxation is shown to be negligible as compared to the overall reorientation. The evidenced anisotropy is very pronounced — reorientation about the major symmetry axis is over ten times faster than about the perpendicular axes. Some hydrodynamic models, tested by the experimentally determined intramolecular contributions to the proton spin-lattice relaxation rates, appear to be insufficient for the adequate description of the motional behaviour.

DOI: 10.1002/bbpc.19830870816   (Pobrane:  aktualizowanie)