Binary diffusion coefficients of l-histidine methyl ester dihydrochloride in aqueous solutions

Rodrigo, M. Melia; Valente, Artur J.M.; Barros, Marisa C.F.; Veríssimo, Luís M.P.; Ramos, M. Luísa; Justino, Licínia L. G.; Ribeiro, Ana C.F.; Esteso, Miguel A.

doi:10.1016/j.jct.2015.05.013

Cited by 10 publications

(5 citation statements)

References 48 publications

(55 reference statements)

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“…The Taylor dispersion method was adopted in this work for measuring the limiting mutual diffusivities (mutual diffusion coefficients at infinite dilution) of the disubstituted benzenes in acetone. This method has been widely used in recent diffusivity measurements − ,− due primarily to the fact that it allows not only precise but also fast acquisition of the diffusion data. Additional advantages of utilizing this method, known also as the chromatographic peak-broadening technique, , have been given by Shevtsova et al The experimental techniques involved in the method have been described by Grushka et al, and the fundamental principles have been reviewed by Tyrrell and Harris and also by Cussler .…”

Section: Methodsmentioning

confidence: 99%

Diffusion of Aromatic Isomers in Acetone: An Investigation on the Effects of Intramolecular and Intermolecular Hydrogen Bonding

et al. 2017

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Limiting mutual diffusivities of o- and m-isomers of methylaniline, nitroaniline, nitrophenol, and aminophenol were measured in acetone at 298.2 K by the Taylor dispersion method. The data reveal that all of the o-substituted solutes capable of intramolecular hydrogen bonding diffuse faster than their m-counterparts without such bonding. By taking into account of the small corrections for the differences in molecular shape and steric hindrance between the o- and m-isomers that can form solute-solvent complexes, the net effects of intramolecular hydrogen bonding were uncovered to render the o-isomers greater in diffusivity by 3-15% as compared to their m-isomers in this study. For aromatic amines and phenols diffusing in acetone, the overall effects of intermolecular hydrogen bonding on diffusivity were ascertained by comparing the available diffusivity data of the associated aromatic solutes with those of the nonassociated ones. The intermolecular effects that cause solutes to diffuse slower were found to vary from approximately 12-39% in the present work. The results indicate that both of the opposite intra- and intermolecular effects are significant. In addition, the quantified effects were analyzed to show that they are closely related to the nature and position of the functional groups contained in the aromatic solutes, including those that are unable to form hydrogen bonds with acetone. A relation that can correlate the diffusivities of the hydrogen-bonded aromatic amines and phenols in acetone with the overall acidities of the compounds is also presented.

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Section: Methodsmentioning

confidence: 99%

Diffusion of Aromatic Isomers in Acetone: An Investigation on the Effects of Intramolecular and Intermolecular Hydrogen Bonding

et al. 2017

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“…Measurements of the limiting mutual diffusivities ( D 12 values) of the disc-shaped aromatic compounds in methanol were performed by using the Taylor dispersion technique. In recent years, this technique has been widely adopted for measuring mutual diffusivities, − as it can provide not only accurate but also fast acquisition of diffusion data. The basic principles of the technique have been reviewed by Tyrrell and Harris .…”

Section: Methodsmentioning

confidence: 99%

Effects of Shapes of Solute Molecules on Diffusion: A Study of Dependences on Solute Size, Solvent, and Temperature

Chan

2015

J. Phys. Chem. B

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Diffusivities of basically linear, planar, and spherical solutes at infinite dilution in various solvents are studied to unravel the effects of solute shapes on diffusion. On the basis of the relationship between the reciprocal of diffusivity and the molecular volume of solute molecules with similar shape in a given solvent at constant temperature, the diffusivities of solutes of equal molecular volume but different shapes are evaluated and the effects due to different shapes of two equal-sized solute molecules on diffusion are determined. It is found that the effects are dependent on the size of the solute pairs studied. Evidence of the dependence of the solute-shape effects on solvent properties is also demonstrated and discussed. Here, some new diffusion data of aromatic compounds in methanol at different temperatures are reported. The result for methanol in this study indicates that the effects of solute shape on diffusivity are only weakly dependent on temperature.

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“…The mutual diffusivities at infinite dilution (limiting mutual diffusion coefficients) of the solutes in acetone were measured at 15 degree intervals from 268.15 to 328.15 K in this study by applying the Taylor dispersion technique. This technique, also known as the chromatographic peak-broadening method, is currently widely employed for measurement of mutual diffusivities. − Many advantages of using this technique have recently been noted by Rossi et al and by Shevtsova et al Mainly, it is a quick, precise, and reliable technique for obtaining diffusivity data. Reviews of the fundamental principles of the Taylor dispersion technique have been given by Cussler and by Tyrrell and Harris .…”

Section: Experimental Sectionmentioning

confidence: 99%

Effects of Hydrogen Bonding on Diffusion of Aromatic Compounds in Acetone: An Experimental Investigation from 268.2 to 328.2 K

Chan

Tang

et al. 2018

J. Phys. Chem. B

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Diffusion coefficients of pseudoplanar aromatic compounds at infinite dilution in acetone have been measured at different temperatures by the Taylor dispersion technique. The data of the polar solutes that can form hydrogen bonds with acetone are compared with those of the nonpolar ones incapable of hydrogen bonding to quantify the effects of hydrogen-bonded association on diffusion. The effects are further found to correlate strongly with the overall hydrogen-bonded acidity of the polar solutes containing proton-donating groups. For the nonpolar solutes in this study, the diffusivities at different temperatures can be expressed very well by the recently developed molecular-modified fractional Stokes-Einstein relation with only two constants. An innovative model for solute diffusion in liquid solutions, which is constructed by combining the molecular-hydrodynamic relation for nonpolar solutes with the overall hydrogen-bonded acidity scale for polar solutes, is introduced for representing the diffusivities of different types of disc-shaped molecules at various temperatures. An equation developed from this model is demonstrated to be capable of calculating a total of 191 diffusion data of both the hydrogen-bonded and the nonassociated aromatic solutes in acetone from 268.2 to 328.2 K to a standard deviation of 2.7%.

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Binary diffusion coefficients of l-histidine methyl ester dihydrochloride in aqueous solutions

Cited by 10 publications

References 48 publications

Diffusion of Aromatic Isomers in Acetone: An Investigation on the Effects of Intramolecular and Intermolecular Hydrogen Bonding

Diffusion of Aromatic Isomers in Acetone: An Investigation on the Effects of Intramolecular and Intermolecular Hydrogen Bonding

Effects of Shapes of Solute Molecules on Diffusion: A Study of Dependences on Solute Size, Solvent, and Temperature

Effects of Hydrogen Bonding on Diffusion of Aromatic Compounds in Acetone: An Experimental Investigation from 268.2 to 328.2 K

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