In:
Zeitschrift für Physikalische Chemie, Walter de Gruyter GmbH, Vol. 222, No. 10 ( 2008-10-1), p. 1519-1532
Abstract:
Densities, ρ and viscosities, η for L-serine, L-threonine, L-glutamine, L-lysine, L-arginine and L-histidine (0.05–0.25 m) in 0.20 m aqueous tetramethylammonium bromide were determined at 298.15, 303.15, 308.15, and 313.15 K. The density data was used to compute apparent molar volume, φ v . The partial molar volume, φ v 0 , at infinite dilution and experimental slope, S v * were obtained from Masson´s equation and interpreted in terms of solute-solvent and solute-solute interactions, respectively. The φ v 0 values are found to vary with temperature as a power series of temperature. The structure-making/-breaking ability of solute were discussed using Hepler´s criterion. The partial molar volumes of transfer, φ v 0 (tr) of amino acid from aqueous to aqueous tetramethylammonium bromide solution were interpreted in the light of cosphere overlap model. The viscosity data was utilized to determine A- and B- coefficients of viscosity, free energy of activation of viscous flow, Δ μ 1 0 * and Δ μ 2 0 * , per mole of solvent and solute, respectively, and Δ H * and Δ S * were also evaluated. The linear variation of φ v 0 and B- coefficient with the number of carbon atoms in the alkyl chain of amino acids was utilized to determine the respective contributions of (NH 3 + , COO – ) and CH 2 groups to φ v 0 and B- coefficient, respectively.
Type of Medium:
Online Resource
ISSN:
2196-7156
,
0942-9352
DOI:
10.1524/zpch.2008.5239
Language:
English
Publisher:
Walter de Gruyter GmbH
Publication Date:
2008
detail.hit.zdb_id:
201103-7
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