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Séminaire Chimie ED459

Three approaches to choose an ionic solvent

Dr. Margarida F. Costa Gomes, D.R. CNRS (ICCF Institut de Chimie de Clermont-Ferrand, UMR 6296 CNRS, Université Clermont-Auvergne)

publié le

Le Jeudi 08 juin 2017 à 13h45
UM FdS, Salle de Cours SC-16.01

Ionic solvents are constituted by ionic liquids or their mixtures and so are composed of large ions, flexible and asymmetric, with delocalization of electrostatic charge. They constitute a family of liquids with a diversity of chemical structures and interactions that leads to unique properties. Ionic solvents can also be structured, with persistent domains formed by aggregates of non-polar side chains and by a network of ionic groups. This segregation of polar and nonpolar domains determines the way in which solvation is understood in these media.

Ionic media are capable of dissolving or stabilizing different solutes or solid materials, ranging from gases[1] to biopolymers[2] or nanomaterials.[3,4] Simple molecular compounds, gaseous at ambient conditions, have been used to assess the microscopic features (both structural and energetic) that control the dissolution process.[5,6] These studies have been the starting point for the development of new ionic solvents capable of dissolving more complex solutes. In each case, the interactions between the solutes and the ionic liquids were evaluated experimentally using phase equilibria measurements and calorimetry techniques, the dissolution mechanisms being investigated spectroscopically or by molecular simulation. It will be shown that one or several effects govern the dissolution or stabilization of the solutes in the ionic solvents – their molecular interactions, the transport properties of the liquid or the arrangement of the solvent around the solute.

References

1. J. Jacquemin, P. Husson, V. Majer, M.F. Costa Gomes, Fluid Phase Equilibria 2006, 240, 87–95.
2. J. M. Andanson, A.A.H. Pádua, M.F. Costa Gomes, Chem. Commun. 2015, 51, 4485–4487.
3. A. Podgorsek, A.S. Pensado, C.C. Santini, M F. Costa Gomes, A.A.H. Pádua, J. Phys. Chem. C 2013, 117, 3537–3547.
4. J. Szala-Bilnik, M.F. Costa Gomes, A.A.H. Pádua, J. Phys. Chem. C 2016, 120, 19396–19408.
5. M.F. Costa Gomes, L. Pison, A.S. Pensado, A.A.H. Pádua, Faraday Discuss. 2012, 154, 41–52.
6. N. Giri, M.G. Del Pópolo, G. Melaugh, R.L. Greenaway, K. Rätzke, T. Koschine, L. Pison, M.F. Costa Gomes, A.I. Cooper, S.L. James, Nature 2015, 527, 216–220.

Contact local ICGM : Dr Peter Hesemann, D.R. CNRS (équipe CMOS)

Voir en ligne : équipe M. Costa-Gomes

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