Thermodynamic data measurement and analysis of organoaluminum supported by β-diketimine ligand in several solvents.

• Solubility of LAlMe 2 in selected pure solvents and binary solvents was measured. • The experimental solubility data were correlated by different models. • The apparent thermodynamic properties of dissolution process were calculated. • Hansen solubility parameter and entropy enthalpy compensation were used to explain the dissolution behavior of LAlMe 2. Organoaluminum compounds are supported by β -diketimine ligands were widely used in organic synthesis, homogeneous catalysis and other fields due to their unique structure and properties. In this article, the static equilibrium method was used to determine the solubility of LAlMe 2 (L = HC(CMeNAr) 2 , Ar = 2,6- i Pr 2 C 6 H 3) in four pure solvents (n -hexane, toluene, tetrahydrofuran, dichloromethane) and two binary solvent systems (n -hexane + toluene, n -hexane + dichloromethane). All operations were performed under Schlenk technology or a glove box under nitrogen atmosphere, and measurement temperature was 263.15 K to 308.15 K. The experimental results showed that the solubility of LAlMe 2 gradually increased with the elevated of temperature and presents an increasing trend with the increase of the mass fraction of co-solvent in the mixed solvent. Hansen solubility parameter explained the dissolution behavior of LAlMe 2. Six thermodynamic models were used to correlate the solubility data. The results showed that the Apelblat model and the Yaws model have the most extensive applicability in both pure solvent and binary solvent systems. In addition, thermodynamic parameters, such as Δ sol Ho, Δ sol So and Δ sol Go were calculated by Gibbs function and Van't Hoff equation and the enthalpy- entropy compensation in the dissolution process was analyzed. It was concluded that dissolution is an endothermic process driven by entropy and Δ sol Ho is the main factor affecting Δ sol Go. [ABSTRACT FROM AUTHOR]