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Refractive Indices Measurement and Correlation for Selected Binary Systems of Various Polarities at 25 °C

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New refractive indices at 25 °C were measured and are reported here for 19 binary mixtures of pentan-3-one+1,2-dichloroethane, +1,3-dichloropropane, +1,4-dichlorobutane, +trichloromethane, +1,1,1-trichloroethane, +1,1,2,2-tetrachloroethane; cyclopentanone+1-chlorobutane, +1,1,2,2-tetrachloroethane; cyclohexanone+1,1,2,2-tetrachloroethane; 5-chloro-2-pentanone+n-hexane, +toluene, +ethylbenzene; nitromethane+trichloromethane; and nitromethane or nitroethane, +1,2-dichloroethane, +1,3-dichloropropane, +1,4-dichlorobutane. The experimental refractive index deviations from linear mixing behavior have been evaluated and correlated consistently with the 3-parameter Redlich–Kister equation with good results. The molar refraction was also examined for the systems including pentan-3-one, cyclopentanone, cyclohexanone and 5-chloro-2-pentanone for which densities and excess molar volumes are available from previous works. Different theoretical (n, ρ) mixing rules were tested for these systems. The excess Gibbs energy G E and excess enthalpy H E values were considered together with the excess molar volumes V E, excess refractive indexes \( n_{\text{D}}^{\text{E}} \), molar refraction R and excess molar refractions R E on mixing in the discussion of the influence of the alkyl chain length or of the nature of the second component in the mixture in terms of molecular interactions.

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Acknowledgments

One of the authors (MT) wishes to thank to the Romanian Academy for financing the research program “Chemical Thermodynamics and Kinetics. Quantum Chemistry” of the “Ilie Murgulescu” Institute of Physical Chemistry. Support of the EU (ERDF) and Romanian Government, which allowed for the acquisition of the research infrastructure under POS-CCE O 2.2.1 Project INFRANANOCHEM-Nr. 19/01.03.2009, is also gratefully acknowledged.

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Authors and Affiliations

  1. “Ilie Murgulescu” Institute of Physical Chemistry of the Romanian Academy, Splaiul Independentei 202, 060021, Bucharest, Romania

    Mariana Teodorescu

  2. Department of Inorganic Chemistry, Physical Chemistry and Electrochemistry, Faculty of Applied Chemistry and Material Science, “Politehnica” University of Bucharest, 1-7 Gh. Polizu Street S1, 011061, Bucharest, Romania

    Catinca Secuianu

  3. Department of Chemical Engineering, Imperial College London, South Kensington Campus, London, SW7 2AZ, UK

    Catinca Secuianu

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  1. Mariana Teodorescu
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Correspondence to Mariana Teodorescu.

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Teodorescu, M., Secuianu, C. Refractive Indices Measurement and Correlation for Selected Binary Systems of Various Polarities at 25 °C. J Solution Chem 42, 1912–1934 (2013). https://doi.org/10.1007/s10953-013-0085-8

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  • DOI: https://doi.org/10.1007/s10953-013-0085-8

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