The densities and viscosities of
glycine, l-alanine, l-valine, l-threonine,
and l-arginine in (0.1
to 0.4) mol·kg<sup>–1</sup> vitamin B6 aqueous solutions
were measured and studied over the entire molality range at (293.15,
303.15, 313.15, and 323.15) K and atmospheric pressure. The apparent
molar volume (<i>V</i><sub>ϕ</sub>), limiting partial
molar volume (<i>V</i><sub>ϕ</sub><sup>0</sup>), and limiting partial molar volume
of transfer (Δ<sub>tr</sub><i>V</i><sub>ϕ</sub><sup>0</sup>) were obtained according
to the experimental density data. The viscosity data were employed
to determine the viscosity <i>B</i> coefficients, the free
energies of activation per mole of solvent (Δμ<sub>1</sub><sup>0⇌</sup>) and solute
(Δμ<sub>2</sub><sup>0⇌</sup>). The influences of temperature, molality, and solute structure
on these parameters were discussed in terms of molecular interactions.
The contributions of the charged end group (NH<sub>3</sub><sup>+</sup>, COO<sup>–</sup>) and CH<sub>2</sub> group to the limiting
partial molar volumes and viscosity <i>B</i> coefficients
were obtained through their linear correlation as a function of the
number of carbon atoms in the alkyl chains of the studied amino acids
