Journal of Chemical and Engineering Data, Vol.48, No.4, 990-994, 2003
Enthalpies of dilution and enthalpies of mixing of alpha-amino acids plus pyridine and alpha-amino acids plus methylpyridine in aqueous solutions at 298.15 K
The enthalpies of mixing of aqueous solutions have been determined for glycine and L-alanine with pyridine and methylpyridine by flow microcalorimetry at 298.15 K. In addition, the enthalpies of dilution at 298.15 K of aqueous solutions containing glycine, L-alanine, pyridine, and methylpyridine have been obtained, respectively. These data have been analyzed using the McMillan-Mayer theory, and heterotactic interaction coefficients are given for the interaction of glycine and L-alanine with pyridine and methylpyridine, among which the enthalpic pair-wise interaction coefficients, h(xy), are discussed in terms of solute-solute interaction and substituent effects.