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 (V(0)(φ,IL)), experimental slope (Sv), viscosity B-coefficient, solvation number (B/V(0)(φ,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.

Heterocyclic Schiff base transition metal complexes in antimicrobial and anticancer chemotherapy

“…[63][64][65] Additionally, these moieties show dominance in the development of organometallic chemistry. 66 Today, we are provided with adequate literature about the variety of methods involved in the synthesis of azomethines/ imines. 67 In addition to the known classical and other (microwave irradiation, ultrasonic irradiation, ionic solvent, solvent-free, etc.)…”

Probing Molecular Interactions between Ammonium-Based Ionic Liquids and N,N-Dimethylacetamide: A Combined FTIR, DLS, and DFT Study

“…Acetamide compounds are highly important molecules because of the presence of −CO and −NH– groups, which are of fundamental significance as models for biomolecular purposes in chemical laboratories, elucidating intermolecular interactions in biomolecules; furthermore, they are vital solvents for practical purposes. In this context, N , N -dimethylacetamide (DMA) is a highly polar compound, highly soluble in a variety of polar and nonpolar solvents, and a readily suitable solvent used to explore dipole–dipole or solvent–solvent interactions in a mixture. − Moreover, it is principally used for polymer dissolution in the artificial fiber production industry because it possesses a very common donor–acceptor −CO–NH– peptide bond and has the property of self-assembly via hydrogen bonding. , Furthermore, DMA is attracting considerable attention as it forms ion-pair interactions with other components in the mixture because of the presence of more electronegative atoms such as oxygen and nitrogen …”

A new highly selective “off–on” typical chemosensor of Al3+, 1-((Z)-((E)-(3,5-dichloro-2-hydroxybenzylidene)hydrazono)methyl) naphthalene-2-ol, an experimental and in silico study

“…13,24,26 Many uorescent chemosensors of metal ions based on Schiff-base have been designed and examined owing to the simplicity, sensitivity, low-cost, synthetic ease, and strong chelating ability. 23,27,28 Since the last decade, sensor molecule based on excited-state intramolecular proton transfer (ESIPT) mechanism draws considerable attention because exclusive photophysical properties like extraordinarily large Stokes shied uorescence emission without self-reabsorption, and environmental sensitivity. 29 A molecule will experience favourably an ESIPT mechanism if it contains both an acidic (hydrogen donor group) and a basic site (hydrogen acceptor group) in proximity leading to keto-enol tautomerization at excited-state.…”