Thermodynamics Research Center / ThermoML | Thermochimica Acta

ABSTRACT

Molar excess volumes, molar excess enthalpies, and speeds of sound data, of pyrrolidin-2-one + ethanol or propan-1-ol or propan-2-ol or butan-1-ol binary mixtures have been determined over entire composition range at 308.15 K. The observed speeds of sound data have been utilized to predict excess isentropic compressibilities of the investigated binary mixtures. The observed excess thermodynamic properties have been analyzed in terms of Graph theory. The analysis of VE data by the Graph theory suggests that pyrrolidin-2-one exists mainly as a mixture of cyclic and open dimer; ethanol as a mixture of dimer and trimer; butan-1-ol and propan-2-ol as mixture of monomer and dimer and propan-1-ol as a dimer in the pure state, and their mixtures contain 1:1 molecularcomplex. The IR studies lend additional credence to the nature and extent of interactions for the proposed molecular entities in the mixtures. Also, it has been observed that VE, HE and ES values predicted by the Graph theory compare well to with their corresponding experimental values.