Solubility measurement and correlation of 2-phenyl-1H-indole in fourteen mono organic solvents from 289.05K to 338.55K

Abstract

2-Phenyl-1H-indole is an important chemical intermediate in organic syntheses. The solubility of 2-phenyl-1H-indole in fourteen pure organic solvents was measured using the gravimetric method from 289.05 to 338.55 K at normal pressure. The results show that the solubility of 2-phenyl-1H-indole in all the solvents increases as temperature rising. The melting point and fusion enthalpy of 2-phenyl-1H-indole were measured with differential scanning calorimeter. The experimental solubility data were correlated with four thermodynamic models, including modified Apelblat equation, λh equation, Wilson equation and NRTL equation. The best correlation results were found with modified Apelblat equation. The mixing thermodynamic functions (Gibbs free energy, enthalpy and entropy) were calculated based on the Wilson equation. The results showed that the entire mixing process is spontaneous.