wizyta

od 2020-09-20

Title: Molecular dynamics in supercooled m-fluoroaniline

Source: Journal of Molecular Structure

Year : 2001

Abstract:

Molecular dynamics of meta-fluoroaniline (mFA) - the system which makes a simple glass forming liquid - was examined by C-13 NMR and dielectric relaxation measurements. Spin-lattice relaxation times TI, nuclear Overhauser (NOE) factors of chemically non-equivalent carbons and dielectric retaxation in mFA were measured as a function of temperature. The analysis showed that the correlation function describing molecular dynamics in mFA could he well described in terms of an asymmetric distribution of correlation rimes predicted by the Davidson-Cole model. The overall correlation times of mFA. derived from the simultaneous fitting of our TI, NOE, and dielectric data (as well as of the dielectric data obtained by Roessler's group) to the Davidson-Cole model, follow the non-Arrhenius temperature type of the behaviour in accordance with the Vogel-Fulcher equation.
(C) 2001 Elsevier Science B.V. All rights reserved.

DOI: 10.1016/S0022-2860(00)00695-5   (Pobrane:  2020-10-21)