Phenol-cyclohexanol eutectic mixtures: phase diagram and microscopic structure by experimental and computational studies
| Autor: | Simone Di Muzio, Annalisa Paolone, Olga Russina, Fabio Ramondo |
|---|---|
| Jazyk: | angličtina |
| Rok vydání: | 2022 |
| Předmět: |
Deep eutectic solvent
Hydrogen bond Molecular dynamic DFTFT-IR Deep Eutectic Solvent hydrogen bond molecular dynamic DSC X-ray diffraction DFT FT-IR Materials Chemistry DSCX-ray diffraction Physical and Theoretical Chemistry Condensed Matter Physics Spectroscopy Atomic and Molecular Physics and Optics Electronic Optical and Magnetic Materials |
| Zdroj: | Journal of molecular liquids 360 (2022): 119492-1–119492-11. doi:10.1016/j.molliq.2022.119492 info:cnr-pdr/source/autori:Di Muzio S.; Paolone A.; Russina O.; Ramondo F./titolo:Phenol-cyclohexanol eutectic mixtures: Phase diagram and microscopic structure by experimental and computational studies/doi:10.1016%2Fj.molliq.2022.119492/rivista:Journal of molecular liquids (Print)/anno:2022/pagina_da:119492-1/pagina_a:119492-11/intervallo_pagine:119492-1–119492-11/volume:360 |
| Popis: | Non ionic deep eutectic solvents (type V) have been recently proposed as innovative and alternative solvents. Prepared by mixing the starting components, their mixtures show strong deviations from thermodynamic ideality. An example of deep eutectic solvent is the 1:1 thymol-menthol mixture: deviations from ideality are originated from the strength of the hydrogen bond between different components. With the aim to investigate the role of hydrogen bonding in the non-ideality of mixtures of phenolic and alcoholic compounds, we studied the phase diagram and the structural properties of cyclohexanol and phenol mixtures coupling experimental and computational techniques. The phase diagram was measured by differential scanning calorimetry (DSC) providing a lowest melting point at about -35°C. The microscopic structure of eutectic composition was characterized by infrared spectroscopy (FT-IR), DFT and classical molecular dynamic simulations. The X-ray pattern was compared with MD results with the aim to describe the intermolecular interactions between phenol and cyclohexanol. The deviations from ideal mixing seem to be smaller than those observed for the 1:1 thymol-menthol mixture. The nature of intermolecular interactions in the phenol-cyclohexanol system has been compared with that of the thymol-menthol system by quantum chemistry calculations. In both the systems heteroassociation is energetically preferred to homoassociation because hydrogen bonding is stronger between different components, however van der Waals contributions involving alkyl groups can play an additional and significant role in the intermolecular association of the thymol-menthol system. |
| Databáze: | OpenAIRE |
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