Solubilities and thermodynamics of TPP in propionic acid + water and TPPMnCl in N,N-dimethylformamide + water solvent mixtures at (303.2–343.2) K

• Solubilities of TPP in propionic acid + water at (303.2–343.2) K were measured.
• Solubilities of TPPMnCl in N,N-dimethylformamide + water at (303.2–343.2) K were measured.
• The experimental data were correlated with the modified Apelblat equation.
• Thermodynamic parameters were calculated by the modified Apelblat equation and Clark–Glew equation.

By static analytical equilibrium method, the solubilities of 5,10,15,20-tetraphenylporphyrin (TPP) in propionic acid + water solvent mixtures and 5,10,15,20-tetraphenylporphyrin manganese(III) chloride (TPPMnCl) in N,N-dimethylformamide + water solvent mixtures were measured from 303.2 K to 343.2 K under atmosphere pressure. The results show that both the solubilities of TPP and TPPMnCl increased with temperature from 303.2 K to 343.2 K. The solubilities of TPP were maximal in pure propionic acid and TPPMnCl were maximal in pure N,N-dimethylformamide, afterwards, the solubility markedly decreased as the mole fraction of water increased in binary solvents mixture at experiment temperatures. The modified Apelblat equation was applied to correlate the experimental data. The solubilities calculated by the modified Apelblat equation were in good agreement with experimental data. The thermodynamic parameters including dissolution enthalpy, dissolution entropy, isobaric heat capacity, and Gibbs free energy of TPP in propionic acid + water solvent mixtures and TPPMnCl in N,N-dimethylformamide + water mixtures were obtained by combining both the modified Apelblat equation and Clark–Glew equation.