https://www.chem.ccu.edu.tw/~joyce/referance/gump/IL/Chem.%20Rev.%201999,%2099,%202071.pdf

Room-Temperature Ionic Liquids. Solvents for Synthesis and Catalysis

Ionic liquids are salts that are liquid at low temperature (<100 degrees C) which represent a new class of solvents with nonmolecular, ionic character. Even though the first representative has been known since 1914, ionic liquids have only been investigated as solvents for transition metal catalysis in the past ten years. Publications to date show that replacing an organic solvent by an ionic liquid can lead to remarkable improvements in well-known processes. Ionic liquids form biphasic systems with many organic product mixtures. This gives rise to the possibility of a multiphase reaction procedure with easy isolation and recovery of homogeneous catalysts. In addition, ionic liquids have practically no vapor pressure which facilitates product separation by distillation. There are also indications that switching from a normal organic solvent to an ionic liquid can lead to novel and unusual chemical reactivity. This opens up a wide field for future investigations into this new class of solvents in catalytic applications.

Ionic Liquids-New "Solutions" for Transition Metal Catalysis.

Characterization and comparison of hydrophilic and hydrophobic room temperature ionic liquids incorporating the imidazolium cation

Protic Ionic Liquids: Properties and Applications

A range of ionic liquids has been investigated using the Kamlet–Taft parameters α, β, and π*. It was found that π* is high for all of the ionic liquids studied and varies with both anion and cation, α is generally moderate and depends mainly on the cation, β is also moderate and depends mainly on the anion. Comparison is made with other polarity measurements in ionic liquids.

/pdf/solvent-solute-interactions-in-ionic-liquids-2j715d76dj.pdf

Solvent-solute interactions in ionic liquids

Chromatographic and spectroscopic studies of the solvent properties of a new series of room-temperature liquid tetraalkylammonium sulfonates

Solvent properties of liquid organic salts used as mobile phases in microcolumn reversed-phase liquid chromatography

Fluorescence properties of benzo[ghi]perylene (BPe) and ovalene (Ov) dissolved in 25 solvents of varying polarity are reported. Measurements indicate that emission intensities depend on solvent polarity. The BPe and Ov solvent polarity scales are defined as the ratio of the fluorescence emission intensities of bands I and III of the vibronic spectra. Benzo[ghi]perylene and ovalene solute probes enable fluorescence measurements to be made in spectral regions less prone to solvent inner filtering and other artifacts which have hampered the use of pyrene (Py) as a polarity probe molecule.

/pdf/polycyclic-aromatic-hydrocarbon-solute-probes-effect-of-3v9c2jzxnd.pdf

Polycyclic Aromatic Hydrocarbon Solute Probes: Effect of Solvent Polarity on the Ovalene and Benzo[ghi]perylene Fluorescence Emission Fine Structures

Applications of ethylammonium and propylammonium nitrate solvents in liquid-liquid extraction and chromatography

The polarities of ethylammonium nitrate (EAN), propylammonium nitrate (PAN) and tributylammonium nitrate (TBAN) are reported based on the photophysical properties of benzo[ghi]perylene dissolved in the liquid organic salts. Numerical BPe values, calculated as the ratio of the emission intensities for bands l and III (BPe = I/III), range from 1.20 for both EAN and PAN to 1.36 for TBAN. These results, combined with the BPe values obtained in an earlier study, suggest that the three liquid organic salts might show similar behaviour to acetonitrile, N,N-dimethylacetamide, N,N-dimethylformamide and dimethyl sulphoxide in terms of their molecular interactions with polycyclic aromatic hydrocarbon solutes.

/pdf/benzo-ghi-perylene-versus-pyrene-as-solute-probes-for-5ap22ethg0.pdf

Prabhakara H. Shetty

Papers

Chromatographic and spectroscopic studies of the solvent properties of a new series of room-temperature liquid tetraalkylammonium sulfonates

Solvent properties of liquid organic salts used as mobile phases in microcolumn reversed-phase liquid chromatography

Polycyclic Aromatic Hydrocarbon Solute Probes: Effect of Solvent Polarity on the Ovalene and Benzo[ghi]perylene Fluorescence Emission Fine Structures

Applications of ethylammonium and propylammonium nitrate solvents in liquid-liquid extraction and chromatography

Benzo[ghi]perylene versus pyrene as solute probes for polarity determination of liquid organic salts used in chromatography