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Excess Heat Capacities of Binary Mixtures Containing o-Chlorotoluene and Pyridine or Isomeric Picolines or Aromatic Hydrocarbons

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Abstract

The excess molar heat capacities, \( \left( {C_{{P}}^{\text{E}} } \right)_{12} \), of binary mixtures of o-chlorotoluene (1) with pyridine, α-, β- or γ-picoline, benzene, toluene or o-xylene (2) have been measured as a function of composition at 298.15, 303.15 and 308.15 K using a micro differential scanning calorimeter (Model-μDSC 7 Evo). The \( \left( {C_{{P}}^{\text{E}} } \right)_{12} \) data have been fitted with the Redlich–Kister equation to calculate binary adjustable parameters along with standard deviations. The sign and magnitude of values of o-chlorotoluene (1) + pyridine or α- or β-picoline (2) are dictated by the relative proportion of components in the mixtures. However \( \left( {C_{{P}}^{\text{E}} } \right)_{12} \) values for o-chlorotoluene (1) + γ-picoline (2) mixture are positive and \( \left( {C_{{P}}^{\text{E}} } \right)_{12} \) values for o-chlorotoluene (1) + benzene or toluene or o-xylene (2) mixtures are negative over the entire mole fraction range. The topology of the constituent molecules has been employed (Graph theory) to determine the \( \left( {C_{{P}}^{\text{E}} } \right)_{12} \) data of the studied mixtures. It has been observed that \( \left( {C_{{P}}^{\text{E}} } \right)_{12} \) values obtained by Graph theory are in agreement with the experimental values.

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Acknowledgments

Rajni Dua is grateful to University Grants Commission (UGC), New Delhi, for the award of Teacher Fellowship under the FIP Scheme. The authors are also grateful to the Head, Chemistry Department and authorities of M. D. University, Rohtak, for providing research facilities.

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  1. Department of Chemistry, M. D. University, Rohtak, 124001, India

    V. K. Sharma & R. Dua

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Sharma, V.K., Dua, R. Excess Heat Capacities of Binary Mixtures Containing o-Chlorotoluene and Pyridine or Isomeric Picolines or Aromatic Hydrocarbons. J Solution Chem 44, 1479–1500 (2015). https://doi.org/10.1007/s10953-015-0349-6

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