Abstract
Mixtures of amines with carboxylic acids give not only limited ionicity, but also fascinating profiles of conductivity vs mixing ratio. These acids, when mixed with pyridine or tertiary amines, produce conductivity maxima at 5:1 (not 1:1) mole:mole mixing ratios. Other historical cases of amine/acid mixtures have produced double maxima vs mixing ratio. A good theory to quantitatively explain these is, after over 100 years, still lacking. Here we report on our recent efforts to extend our 2018 pyridine/acetic acid theory to apply to trialkylamine/acid cases. Unlike the pyridine case, where the maxima in volume contraction, viscosity, ion concentration, and conductivity are all at the 5:1 ratio, the trialkylamine cases show more structural complexity; for instance, triethylamine with propionic acid produces these four maxima at four unique ratios (2:1, 3:1, 4:1, and 5:1 respectively). Our extension incorporates some excellent advances put forward by Huyskens in 1980 for these trialkylamine cases.
Published Version
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