Fig. 2: Dielectric spectra of aqueous 2Ala solutions are consistent with uncorrelated dipolar rotation of 2Ala.
From: Ion-specific binding of cations to the carboxylate and of anions to the amide of alanylalanine
Complex permittivity spectrum of (a) 0.25 M aqueous 2Ala solution and b aqueous 2Ala solutions with increasing concentration of 2Ala. Solid circles and crosses show the experimental dielectric permittivity (ε′) and dielectric loss spectra (ε″), respectively. Solid lines show fits of Eq. (1) to the experimental data. The contribution of the 2Ala and the water relaxations to the dielectric loss are shown as shaded areas in (a). Conductivity contributions (last term of Eq. (1)) have been subtracted for visual clarity in (a, b). c Shows the constant effective dipole moment of 2Ala µeff(2Ala) as calculated from the 2Ala relaxation amplitude as a function of 2Ala concentration. Error bars are based on the standard deviation within eight independent measurements.
