Abstract
Densities of several aqueous solutions of two macrocyclic aminals, 1,3,5,7-tetraazatricyclo[3.3.1.1(3,7)]decane (HMT) and 1,3,6,8-tetraazatricyclo[4.4.1.1(3,8)]dodecane (TATD) at concentrations from 0.001 up to 0.2 mol⋅kg−1 (molal) between 2.0 and 5.0 °C every 0.5 °C, were obtained using a magnetic float densimeter designed, constructed and calibrated according to the available literature. The effect of the two solutes on the temperature of the maximum density of the water θ was established. The dependence of density with molality is linear in the entire range of concentration, at all temperatures, and the dependence of Δθ with composition, for both aqueous systems, does not follow the Despretz law. Based on the variation of Δθ with composition, the solutes are classified as liquid water structure breakers; the effect of TATD on the solvent is greater. The results are discussed in terms of solute–solvent and solute–solute interactions.
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