Thermodynamics of 4’-bromomethyl-2-cyanobiphenyl in different solvents

• The melting properties of OTBNBr were investigated.
• The solubility of OTBNBr in eight selected organic solvents has been determined.
• The interaction of solvents molecules plays a dominated role in the dissolving behavior.
• The experimental solubility data in pure solvents were well correlated by four models.
• The activity coefficient and temperature dependence of van’t Hoff enthalpy were investigated.

The melting properties and the heat capacity of the solid state and the melt state 4’-bromomethyl-2-cyanobiphenyl (OTBNBr) were determined. The enthalpy, entropy and Gibbs free energy of fusion were also calculated. The solubility of OTBNBr in eight organic solvents was experimentally measured at temperatures from (283.15 to 323.15) K by using a static method. The reasons for the differences of the solubility of OTBNBr in various solvents are discussed by using the intermolecular interaction. Furthermore, the experimental solubility values were well correlated by the modified Apelblat equation, the λh equation, the Wilson model and the van’t Hoff equation. Finally, the temperature dependence of the activity coefficient and the van’t Hoff enthalpy in the tested solutions was investigated and is discussed.

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