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Title: Effects of molecular association on mutual diffusion : a study of hydrogen bonding in dilute solutions
Authors: Lu, J. G.
Kong, Rita
Chan, Tze-chung
Subjects: Solutions
Issue Date: 8-Feb-1999
Publisher: American Institute of Physics
Source: Journal of chemical physics, 8 Feb. 1999, v. 110, no. 6, p. 3003-3008.
Abstract: Diffusivities of pseudoplanar molecules at trace concentration in methanol have been measured at 298.2 K using Taylor’s dispersion method. The data of the polar and nonpolar aromatic solutes are compared, and the effects due to solute–solvent interactions on diffusion, together with the solvation numbers, are determined. In this study, the effects are combined with the recently developed solute hydrogen-bond scales to unravel hydrogen bonding between solute and solvent. It is found that the degrees of association of the solutes with methanol decrease in the sequence hydroquinone > aromatic acids > phenols > aromatic amines > aprotic aromatic compounds. Except for o-nitrophenol, which is capable of intramolecular hydrogen bonding, all aromatic acids, phenols, and amines studied behave more as hydrogen-bond donor than acceptor in methanol. The present work also indicates that motions of associated molecules can be understood in terms of the molecular behavior of nonassociated solutes and the hydrogen-bond acidity/basicity of polar solutes.
Rights: © 1999 American Institute of Physics. This article may be downloaded for personal use only. Any other use requires prior permission of the author and the American Institute of Physics. The following article appeared in J. G. Lu, R. Kong & T. C. Chan, J. Chem. Phys. 110, 3003 (1999) and may be found at
Type: Journal/Magazine Article
DOI: 10.1063/1.477895
ISSN: 1089-7690 (online)
0021-9606 (print)
Appears in Collections:ABCT Journal/Magazine Articles

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