Effect of tetrabutylammonium bromide on solution behavior of salicylaldehyde anil zinc (II) in methanol at T = (298.15, 308.15 and 318.15) K

• Bu4NBr + MeOH mixtures used as solvents.
• Salicylaldehyde anil zinc (II) was used as solute.
• Partial molar volumes and viscosity B-coefficients of the solute were determined.
• The sign of (∂ϕE0/∂T)P values were indicated the structure breaking ability of the solute.
• Strong solute–solvent interactions are present in the ternary systems studied.

Partial molar volumes (ϕV0) and viscosity B-coefficients of salicylaldehyde anil zinc (II), abbreviated as SAZ, in (0.00, 0.02, 0.04 and 0.05) mol ⋅ dm−3 tetrabutylammonium bromide (Bu4NBr) solutions in methanol (MeOH) were determined from solution density and viscosity measurements at (298.15, 308.15 and 318.15) K under ambient pressure. Apparent molar volumes (ϕV) and solution densities (ρ) were further used to determine isobaric apparent molar expansibilities (ϕE  ), isobaric partial molar expansibilities (ϕE0) and temperature dependence of isobaric partial molar expansibilities (ϕE0) at constant pressure, (∂ϕE0/∂T)P of SAZ solutions to study the nature of different interactions in the ternary solutions. The transition state theory was applied to analyze the viscosity B-coefficients of the ternary solutions on the basis of the activation parameters of viscous flow. The overall results indicated strong solute–solvent interactions between SAZ and the solvent mixture and SAZ acts as a net structure breaker in the ternary solutions. UV-Visible absorption spectra of the ternary solutions also stand in support of the results obtained.

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