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Monte Carlo Study of Structural and Thermodynamic Properties of Liquid Chloroform Using a Five Site Model

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Molecular Engineering

Abstract

A five site potential model combining Lennard–Jones plus Coulomb potential functions has been developed for chloroform molecule. The partial charges needed for Coulombic interactions were derived using the chelpg procedure implemented in the gaussian 92 program. These calculations were performed at the MP2 level with MC-311G* basis set for Cl and 6-311G** for C and H atoms. The parameters for the Lennard–Jones potentials were optimized to reproduce experimental values for the density and enthalpy of vaporization of the pure liquid at 298 K and 1 atm. The statistical mechanics calculations were performed with the Monte Carlo method in the isothermic and isobaric (NpT) ensemble. Besides the values obtained for density, ρ, and molar enthalpy of vaporization at constant pressure, Δ HV, for liquid chloroform, results for molar volume, Vm, molar heat capacity, Cp, isobaric thermal expansivity, αp, and isothermal compressibility, κT, for this pure liquid are also in very good agreement with experimental observations. Size effects on the values of thermodynamic properties were investigated. The potential model was also tested by computing the free energy for solvating one chloroform molecule into its own liquid at 298 K using a statistical perturbation approach. The result obtained compares well with the experimental value. Site–site pair correlation functions were calculated and are in good accordance with theoretical results available in the literature. Dipole–dipole correlation functions for the present five site model were also calculated at different carbon–carbon distances. These correlations were compared to those obtained using the four site model reported in the literature. An investigation of the solvent dependence of the relative free energy for cis/trans conversion of a hypothetical solute in TIP4P water and chloroform was accomplished. The results show strong interaction of water and chloroform molecules with the gauche conformer. The value obtained for the free energy barrier for cis/trans rotation in TIP4P water is higher than that for chloroform. This result is in agreement with the continuous theory for solvation as the conformer with higher dipole moment is more favoured by the solvent with higher dieletric constant. The results also show an increase in entropy as the solute goes from the cis to the trans geometry and this result is more appreciable in the aqueous solution.

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Authors and Affiliations

  1. Departamento de Física, Universidade Federal de São Carlos, CP676, CEP, 13565-905, Satilde;o Carlos, SP, Brasil

    Vania Elisabeth Barlette

  2. Centro de Nacional de Computação de Alto Desempenho, Campinas, SP, Brazil

    Fábio Luiz Laurenti Garbujo

  3. Departamento de Química, Universidade Federal de São Carlos, CP676, CEP, 13565-905, São Carlos, SP, Brasil

    Luiz Carlos Gomide Freitas

Authors
  1. Vania Elisabeth Barlette
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  2. Fábio Luiz Laurenti Garbujo
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  3. Luiz Carlos Gomide Freitas
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Barlette, V.E., Garbujo, F.L.L. & Freitas, L.C.G. Monte Carlo Study of Structural and Thermodynamic Properties of Liquid Chloroform Using a Five Site Model. Molecular Engineering 7, 439–455 (1997). https://doi.org/10.1023/A:1008232630306

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