Volume-related interaction parameters for dilute solutions of Mebicaret (2,4-dimethyl-6,8-diethylglycoluril) in normal and heavy water between 278.15 K and 318.15 K

Abstract Density measurements on solutions of 2,4-dimethyl-6,8-diethyl-2,4,6,8-tatraazabicyclo[3.3.0]octane-3,7-dione or Mebicaret in normal (H 2 O) and heavy (D 2 O) water were carried out with a precision of 0.012 kg·m − 3 using the Anton Paar DMA 5000 M vibrating tube densimeter. All experiments were performed within the temperature range between 278.15 K and 318.15 K (with a step of 10 K) at the pressure to be ca. 99.6 kPa. The solution aquamolality was ranged from 0.02 to 0.2 mol ∙(55.51 mol of solvent) − 1 for each of H/D isotopically distinguishable systems compared. The standard (partial at infinite dilution) molar volumes ( V 2 o ) and expansibilities ( E p  , 2 o ) of the solute as well as volume-related second virial coefficients ( v 22 ) were derived from the data on a solution density. The behavior of solvent isotope effects (IEs) on the considered quantities was described given the structure- and interaction-related peculiarities of the Mebicaret molecule as well as H 2 O and D 2 O media. The volume-related interaction characteristics for the solute of interest were discussed using the results of our previous densimetric and calorimetric studies with the participation of similar N -tetraalkylated glycoluril-derivatives.