Enthalpies of Interaction of N,N-Dimethylformamide with Polyalcohols in Aqueous Solutions at 298.15 K

Abstract

Enthalpies of mixing of aqueous DMF solutions with aqueous polyalcohols (glycol, 1,2-propanediol, 1,3propanediol, and glycerol) solutions and their respective enthalpies of dilution have been determined at 298.15 K using flow microcalorimetry. The experimental results obtained have been analyzed to give the heterotactic enthalpic interaction (or virial) coefficients of the solutes in terms of the McMillan-Mayer model. The enthalpic pairwise interaction coefficients h xy have been discussed from the points of view of solute-solute interactions. In addition, using the additivity groups approach by Savage and Wood (SWAG), contributions of each of the functional group of DMF and the polyalcohol studied have been estimated.

Solvent and pH Dependences of Mixing Enthalpies of N-Glycylglycine with Protocatechuic Acid

“…The flow rates during a complete experiment were kept constant with a difference of less than 0.1%. Further information about this apparatus, associated equipment, and the experimental procedure has been reported already. , …”

Enthalpic pairwise self-interactions of urea and its four derivatives in (dimethylformamide + water) mixtures rich in water at T = 298.15 K

“…The magnitude of h 2 coefficient is determined by the competition balance between hydrophobic and hydrophilic interactions of solutes in aqueous solutions [51][52][53][54][55][56]. Urea-like compounds have been described as both ''structure makers" and ''structure breakers" with respect to the structure of water in solution [56][57][58][59][60].…”

Enthalpic interactions of N-glycylglycine with xylitol in aqueous sodium chloride and potassium chloride solutions at T=298.15K

“…The calorimetric measurements were performed with a 2277-204 Measuring Cylinder supported by a Thermometric 2277 Thermal Activity Monitor (Thermometric, Sweden) at T = 298.15 K. Details of this apparatus, associated equipment, and the experimental procedure have been reported elsewhere [19][20][21][22]. The solutions were pumped through the mixing-flow vessel of the calorimeter using VS2-10R MIDI dual channel pumps.…”