Size-dependent diffusion in cycloalkanes

The translational diffusion constants, D, of biphenyl, trans-stilbene, 1,4-diphenyl-1,3-butadiene, 1,1,4,4-tetraphenyl-1,3-butadiene, 1,6-diphenyl-1,3,5-hexatriene, tetraphenylethylene, 9,10-diphenylanthracene, bibenzyl, triptycene, perylene and 2,3-benzanthracene (tetracene) have been measured in c...

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Published in:Molecular physics 2004-07, Vol.102 (13), p.1489-1497
Main Authors: Kowert, Bruce. A., Jones, Jared B., Zahm, Jacob A., Turner II, Robert M.
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description The translational diffusion constants, D, of biphenyl, trans-stilbene, 1,4-diphenyl-1,3-butadiene, 1,1,4,4-tetraphenyl-1,3-butadiene, 1,6-diphenyl-1,3,5-hexatriene, tetraphenylethylene, 9,10-diphenylanthracene, bibenzyl, triptycene, perylene and 2,3-benzanthracene (tetracene) have been measured in combinations of the cycloalkanes cyclohexane, methylcyclohexane, n-butylcyclohexane, cis-decalin and trans-decalin using capillary flow techniques. Tetracene and chrycene have been studied in a series of n-alkanes. Deviations from the Stokes-Einstein (SE) relation (D = k B T/6πηr) were found. For a given solute, the hydrodynamic radius r decreases as both the viscosity η and the solvent/solute size ratio increase; the data were fitted to D/T = A/η  p with p
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The p values in the cycloalkanes increase as the solute size increases, are compared to the values in the n-alkanes and are discussed in terms of the properties of the two types of solvent. 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title Size-dependent diffusion in cycloalkanes
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