Excess molar volumes, excess molar enthalpies and excess isentropic compressibilities of 1-methyl pyrrolidin-2-one with water and propanols

摘要

Excess molar volumes V ~E, excess molar enthalpies H ~E, and speeds of sound u for 1-methyl pyrrolidin-2-one (1) + water or propan-1-ol or propan-2-ol (2) binary mixtures have been measured over the entire composition range (at 308.15 K) using a dilatometer, calorimeter and interferometer. Speeds of sound data, u, of (1 + 2) binary mixtures have been utilized to determine excess isentropic compressibilities, κ _S ~E. The observed V ~E, H ~E and κ_S ~E data have been analyzed in terms of (1) Graph theory (which involves the topology of the constituents of mixture), and (2) the Prigogine-Flory-Patterson theory. Analysis of V ~E data in terms of Graph theory suggests that 1-methyl pyrrolidin-2-one, water, propan-1-ol, and propan-2-ol exist as associated molecular entities. IR studies lend additional support to the proposed molecular entities in (1 + 2) mixtures. It has been observed that V ~E, H ~E and κ_S ~E values predicted by Graph theory compare well with their corresponding experimental values.