Effect of solvent on the volumetric behavior of N,N′-salicylidenephenyl diamine (Salophen) Schiff base at different temperatures (288.15–318.15) K

Densities of binary mixtures containing N,N′-salicylidenephenyl diamine (Salophen) + organic solvents {dimethylsulfoxide (DMSO), N,N-dimethylacetamide (DMA), 1,4-dioxacyclohexane (1,4-dioxane), and oxolane (THF)} have been measured at 10 K intervals from 288.15 K to 318.15 K. Using these data, apparent molar volumes ( V ϕ ), standard partial molar volumes ( V ϕ 0 ), standard partial molar isobaric expansivity ( E ϕ 0 ), Heplerʹs constant ( ∂ 2 V ϕ 0 / ∂ T 2 ) p , and isobaric thermal expansion coefficient (α) have been calculated for all the mixtures. The values of interaction volumes (Vint), and cavity volumes (Vcav) have also been estimated using the scaled particle theory [20]. The results show that Salophen in the studied organic solvents predominantly acts as a structure-breaker.