Structure Breaking/Making Property of Acefylline Piperazine in Aqueous,Aqueous Methanol,and Aqueous Ethylene Glycol Systems |
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Authors: | S. Masood W. Rehman Z. Khan H. Arshad S. Begum A. Perveen |
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Affiliation: | 1.Department of Chemistry,University of Karachi,Karachi,Pakistan;2.Department of Food Science and Technology,University of Karachi,Karachi,Pakistan |
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Abstract: | Densities of acefylline piperazine (AP) in aqueous, aqueous methanol, and aqueous ethylene glycol (10% v/v) systems are determined in the concentration range 0.04-0.14±0.001 mol/dm3 at different temperatures (298.15-318.15 K) with the interval of 5 K. The apparent molar volume (φv), the partial molar volume ((phi_v^0)), and the ion-ion interaction parameter (Sv) are calculated using the Masson equation. Partial molar expansibilities ((phi_E^0)), which indicate the presence or absence of the caging or packing effect, are also evaluated and discussed. The results are interpreted in terms of solute-solvent and solute-solute interactions of AP in aqueous, aqueous methanol, and aqueous ethylene glycol systems. The structure-breaking and structure-making properties of AP are inferred by the sign of Hepler′s criterion ((partial^2phi_v^0/partial{T}^2)_p), i.e. the second derivative of the partial molar volume with respect to the temperature at the constant pressure. |
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