II. SEE-ERA-NET
Titlu: Understanding Ionic Liquids as Novel Solvent in Green Chemistry
Abstract
Ionic liquids (ILs) are salts composed by organic cations and
inorganic or organic anions that are liquid near room temperature. The potential
of ILs to provide a non-volatile solvent system has become a practical target
for reducing waste and hazards by eliminating traditional volatile organic
solvents. For these reasons, in the last few years, ILs have attracted great
attention as “green and designer” media for chemical reactions.
Despite the extensive work carried out on applications of ionic
liquids there is still a lack of fundamental knowledge about their structure and
physico-chemical properties. In this context, a deeper insight into the
interactions between different solvents, such water and ILs is needed in order
to better understand the properties of ILs based mixed solvents.
Thus, a complete experimental and theoretical approach is proposed aiming to
obtain the electronic molecular structure of ILs and their interaction modes in
the presence of water molecules. For these purposes, infrared and Raman
spectroscopy will be employed for the study of different ionic liquid - water
mixtures. Data analysis performed using multivariate curve resolution (MCR) will
offer information regarding the presence of different monomer or/and dimer
species upon increasing water concentration in ionic liquids or by modifying the
temperature of the mixtures. Also Two Dimensional Correlation Spectroscopy
(2DCoS) will be used as a method that is spreading the modulated spectra over a
second spectral dimension, thus enhancing spectral resolution. Furthermore,
Density Functional Theory (DFT) calculations will be employed for modelling the
ionic liquid - water monomer/dimer structure as well as for vibrational spectra
prediction. Thus, the calculated molecular structures will be validated by
comparing the calculated vibrational bands with those obtained experimentally.
In this way, assessments about the interaction modes and electronic structures
of the ionic liquid - water monomer/dimer clusters will be obtained. These
informations are of great importance for understanding the ILs structure and its
interaction modes at molecular level.
In colaborare cu: TU Viena, Faculty of Science, University of Zagreb - Croatia
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