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Fluorescence dynamics in supercooled (acetamide + calcium nitrate) molten mixtures
H.A.R. Gazi, , S. Daschakraborty, R. Biswas
Published in
Volume: 501
Issue: 4-6
Pages: 358 - 363
Fluorescence dynamics of a polar solute probe in molten (CH 3CONH2 + Ca(NO3)2·4.37H 2O) mixtures have been measured in order to probe the solute-medium interactions in such complex systems. Steady state and time-resolved measurements bear no signatures of mega-value of the static dielectric constant, strong heterogeneity and extremely slow relaxation times reported in dielectric relaxation experiments for these molten mixtures. Subsequent applications of a semi-molecular theory reveal both the solute-medium dipole-dipole and ion-dipole interactions contribute significantly to the measured Stokes' shifts. Calculated average solvation times in the underdamped and overdamped limits of frictional solvent response agree semi-quantitatively with those from time-resolved measurements. © 2010 Elsevier B.V. All rights reserved.
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