Issue 3, 2015

Schiff base ligands and their transition metal complexes in the mixtures of ionic liquid + organic solvent: a thermodynamic study

Abstract

Schiff bases and their metal complexes in the mixtures of ionic liquid (IL) + organic solvent have shown great potential in attractive oxidation catalytic processes. The efficiency of such a process is strongly dependent on the various molecular interactions occurring between components. Thermodynamic properties of these systems can provide valuable information about structural interactions. Therefore, in this work, the interactions of the IL 1-hexyl-3-methylimidazolium chloride ([HMIm]Cl) with Schiff bases in organic solvents were studied through the measurements of density, viscosity, and electrical conductivity. The effect of solvent on the interactions was examined by the solutions of IL + BPIC Schiff base + solvent (C2H6O–C3H8O–C4H10O). Moreover, the influence of Schiff base ligand and Schiff base complex structures was probed by the solutions of IL + DMA + ligand (salcn/salpr/salen) and IL + DMA + complex (VO(3-OMe-salen)/VO(salophen)/VO(salen)), respectively. Using the experimental data, some important thermodynamic properties, such as standard partial molar volume (V0ϕ,IL), experimental slope (Sv), viscosity B-coefficient, solvation number (B/V0ϕ,IL), and limiting molar conductivity (Λ0) were calculated and discussed in terms of solute–solvent (IL–DMF/alcohol) and solute–cosolute (IL–Schiff base) interactions.

Graphical abstract: Schiff base ligands and their transition metal complexes in the mixtures of ionic liquid + organic solvent: a thermodynamic study

Article information

Article type
Paper
Submitted
30 Sep 2014
Accepted
25 Nov 2014
First published
25 Nov 2014

Phys. Chem. Chem. Phys., 2015,17, 2179-2191

Author version available

Schiff base ligands and their transition metal complexes in the mixtures of ionic liquid + organic solvent: a thermodynamic study

H. Shekaari, A. Kazempour and M. Khoshalhan, Phys. Chem. Chem. Phys., 2015, 17, 2179 DOI: 10.1039/C4CP04432K

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