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Correlation between molecular interactions and excess thermodynamic parameters of binary mixtures


Affiliations
1 Department of Chemistry, Dyal Singh College (University of Delhi), New Delhi - 110 003, India
2 Department of Chemistry, Amity University Dubai Campus, Dubai International Academic City, Dubai, United Arab Emirates
 

Excess thermodynamic parameters, viz., internal pressures, πi, free volumes, Vf, excess internal pressures, πiE, excess free volumes, VfE, excess free energy, GE, excess enthalpy, HE and entropy, SE of mixing for the binary mixtures of 1,4-dioxane with aromatic hydrocarbons (benzene, toluene, o-xylene, m-xylene, p-xylene and mesitylene) have been evaluated from experimental ultrasonic speed and density data over the whole composition range at 298.15 K. The results are interpreted from the point of view of prevailing intermolecular interactions between unlike molecules in the mixture. Electron donor-acceptor type (or charge-transfer) interactions between 1,4-dioxane (acting as donor) and the π-electrons of ring of aromatic hydrocarbon molecules (acting as acceptor) have been observed and the magnitude of these interactions in the mixtures follow the order: benzene > toluene > p-xylene > m-xylene > o-xylene > mesitylene.

Keywords

Aromatic hydrocarbons, excess properties, free volume, internal pressure, molecular interactions, 1,4-Dioxane.
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  • Correlation between molecular interactions and excess thermodynamic parameters of binary mixtures

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Authors

Anil Kumar Nain
Department of Chemistry, Dyal Singh College (University of Delhi), New Delhi - 110 003, India
Dinesh Chand
Department of Chemistry, Amity University Dubai Campus, Dubai International Academic City, Dubai, United Arab Emirates

Abstract


Excess thermodynamic parameters, viz., internal pressures, πi, free volumes, Vf, excess internal pressures, πiE, excess free volumes, VfE, excess free energy, GE, excess enthalpy, HE and entropy, SE of mixing for the binary mixtures of 1,4-dioxane with aromatic hydrocarbons (benzene, toluene, o-xylene, m-xylene, p-xylene and mesitylene) have been evaluated from experimental ultrasonic speed and density data over the whole composition range at 298.15 K. The results are interpreted from the point of view of prevailing intermolecular interactions between unlike molecules in the mixture. Electron donor-acceptor type (or charge-transfer) interactions between 1,4-dioxane (acting as donor) and the π-electrons of ring of aromatic hydrocarbon molecules (acting as acceptor) have been observed and the magnitude of these interactions in the mixtures follow the order: benzene > toluene > p-xylene > m-xylene > o-xylene > mesitylene.

Keywords


Aromatic hydrocarbons, excess properties, free volume, internal pressure, molecular interactions, 1,4-Dioxane.

References