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Hydrogen Bonding in Ionic Liquids - Vibrational Spectroscopy and Physical Properties

Grant number: 20/09250-3
Support type:Scholarships in Brazil - Doctorate
Effective date (Start): December 01, 2020
Effective date (End): November 30, 2024
Field of knowledge:Physical Sciences and Mathematics - Chemistry - Physical-Chemistry
Principal researcher:Rômulo Augusto Ando
Grantee:Beatriz Rocha de Moraes
Home Institution: Instituto de Química (IQ). Universidade de São Paulo (USP). São Paulo , SP, Brazil
Associated research grant:16/21070-5 - Vibrational spectroscopy with spatial resolution, AP.TEM

Abstract

Ionic liquids (IL) are characterized by low melting points even being constituted exclusively by ions. Both the IL structure and their properties are governed by a subtle balance between Coulomb, London dispersion, and hydrogen bonding forces. The latter has a crucial role since it is responsible for disturbing the charge ordering induced by Coulombic interactions, fluidizing the liquid. Therefore, the IL properties can be modulated by the tuning of the ratio between Coulomb interactions and hydrogen bonding between ions. In the present project, we aim to perform a systematic investigation of such interactions, mainly the hydrogen bonding, in ionic liquids, with three distinct approaches: (i) mixtures between ionic liquids, (ii) mixtures between ionic liquids and common solvents, and (iii) insertion of probe molecules sensitive to hydrogen bonding. These systems will be investigated by different spectroscopic techniques, particularly vibrational spectroscopy (Raman and infrared) as a function of molar fraction, pressure, and temperature. The correlation between physical properties as viscosity, density and melting point of the different systems with the microscopic properties obtained by spectroscopic techniques, will contribute to a better understanding of how the hydrogen bonds rule some of the main IL characteristics, which is fundamental for the application of such solvents in several processes.