Abstract
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, \( \kappa_{S}^{\text{E}} \). The observed V E, H E and \( \kappa_{S}^{\text{E}} \) 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 \( \kappa_{S}^{\text{E}} \) values predicted by Graph theory compare well with their corresponding experimental values.
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The authors are thankful to the authorities of M.D. University, Rohtak, for providing research facilities.
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Yameeka, Dimple, Yadav, J.S. et al. Excess Molar Volumes, Excess Molar Enthalpies and Excess Isentropic Compressibilities of 1-Methyl Pyrrolidin-2-one with Water and Propanols. J Solution Chem 42, 372–389 (2013). https://doi.org/10.1007/s10953-013-9963-3
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DOI: https://doi.org/10.1007/s10953-013-9963-3