Viscosity Dependence of the Rotational Reorientation of Rhodamine B in Mono- and Polyalcohols. Picosecond Transient Grating Experiments
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چکیده
hydrogen bonds between C-3 OH and the carboxyl. It seems difficult to invoke an intermolecular hydrogen bond without having some sort of added hydrophobic contribution in aqueous solution. This kind of effect has been observed in aliphatic carboxylic acids-larger aliphatic chains leading to stronger dimerization effects in aqueous solution.32 To describe the 13C NMR shifts as due to intermolecular hydrogen bonding seems too simple for aqueous solutions of NaDC. Perhaps some partial hydrophobic interactions, which may be back-to-back hydrophobic interaction between bile salt molecules, occur in the initial aggregation, and this then changes when the “normal” micelles begin to form. D e ~ n o y e r s ~ ~ uggested that the model of the partial hydrophobic interaction in the polymer-like aggregate may be Fujiyama’s model; i.e., water molecules lie between hydrophobic molecules.” The decrease of the partial molal volume with the concentration
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