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Excess Thermodynamic Properties for Binary Mixtures of Ionic Liquid 1-Ethyl-3-methylimidazolium Ethyl Sulfate and 2-Methoxyethanol from T = (298.15 to 328.15) K at Atmospheric Pressure

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Abstract

The density (ρ), speed of sound (u) and refractive index (n D) for pure [Emim][EtSO4], 2-methoxyethanol and their binary mixtures were measured using an Anton Paar vibrating tube density and sound velocity meter (DSA 5000 M) and automatic refractometer over the whole composition range as a function of temperature between 298.15 and 328.15 K in steps of 10 K at atmospheric pressure. Experimental values were used to calculate the excess values of molar volumes (\( V_{\text{m}}^{\text{E}} \)), partial molar volumes (\( \overline{V}_{\text{m}}^{\text{E}} \)), partial molar volumes at infinite dilution (\( \overline{V}_{\text{m}}^{{{\text{E,}}\infty }} \)), isentropic compressibility (\( \kappa_{S}^{\text{E}} \)), acoustic impedance (Z E), free length (\( L_{\text{f}}^{\text{E}} \)), speeds of sound (\( u_{{}}^{\text{E}} \)), internal pressure (\( \mathop \pi \nolimits_{i}^{\text{E}} \)), free volume (\( V_{\text{f}}^{\text{E}} \)) and deviations in refractive index ( \( \Delta_{\phi } n_{\text{D}} \)) for the binary mixtures. These properties were fitted to a Redlich–Kister type equation to obtain the binary coefficients and the standard deviations. The negative values of \( V_{\text{m}}^{\text{E}} \), \( \kappa_{S}^{\text{E}} \), \( L_{\text{f}}^{\text{E}} \),\( \alpha_{p}^{\text{E}} \), and \( V_{\text{f}}^{\text{E}} \) and positive values for Z E, \( u_{{}}^{\text{E}} \),\( \mathop \pi \nolimits_{i}^{\text{E}} \), and \( \Delta_{\phi } n_{\text{D}} \) indicate the existence of strong interactions between the components. This was further supported by IR spectroscopy analysis.

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Authors and Affiliations

  1. Department of Chemistry, KRK Govt. Degree College, Addanki, A.P., 523201, India

    M. Srinivasa Reddy

  2. Department of Chemistry, Andhra Loyola College, Vijayawada, A.P., 520008, India

    K. Thomas S. S. Raju

  3. Department of Physics, KRK Govt. Degree College, Addanki, A.P., 523201, India

    Sk. Md Nayeem

  4. Chemistry Department, CICECO, Aveiro Institute of Materials, University of Aveiro, 3810-193, Aveiro, Portugal

    Imran Khan

  5. Department of Chemistry, Acharya Nagarjuna University, N.Nagar, Guntur, A.P., 522510, India

    M. Srinivasa Reddy, K. B. M. Krishana & B. Hari Babu

  6. Department of Chemistry, College of Science, Sultan Qaboos University, PO Box 36, 123, Muscat, Oman

    Imran Khan

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Reddy, M.S., Raju, K.T.S.S., Nayeem, S.M. et al. Excess Thermodynamic Properties for Binary Mixtures of Ionic Liquid 1-Ethyl-3-methylimidazolium Ethyl Sulfate and 2-Methoxyethanol from T = (298.15 to 328.15) K at Atmospheric Pressure. J Solution Chem 45, 675–701 (2016). https://doi.org/10.1007/s10953-016-0465-y

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