One of the longest-standing problems facing the chemical industry and academia is the continued reliance on substantial amounts of volatile organic compounds (VOCs). The VOCs, which are used in many of the synthetic catalytic polymerization reactions, and in various types of separation, and extraction processes. These are generally toxic, hazardous, flammable, and environmentally damaging in nature.

As replacements of these VOCs, ionic liquids (ILs) have appeared as potential alternatives due to their unusual physicochemical properties and immense application potential in many fields. Ionic liquids have currently emerged as an intriguing modern materials in science, and technology. To understand and explore the unique and interesting features associated with ionic liquid-based systems, analytical methods such as electrochemical, and spectroscopic techniques are of utmost importance.

The aim of this Special Issue is to collate original research articles, as well as review articles, highlighting current knowledge about the unique features associated with ionic liquid-based systems using various analytical methods. For instance, submissions focusing on spectroscopy (e.g., ultraviolet-visible spectroscopy, fluorescence, fourier-transform infrared spectroscopy, nuclear magnetic resonance spectroscopy), and electrochemical methods (e.g., voltammetry, and amperometry) are particularly encouraged. This Special Issue also hopes to gather specific research describing the application of electrochemistry, and spectroscopy to understand the interactions taking place between ionic liquids, and other compounds of value.

Potential topics include but are not limited to the following:

• Ionic liquids, and structure-property relationship
• Ionic liquids, and green chemistry
• Ionic liquids in photovoltaics
• Ionic liquids in lithium-Ion batteries
• Ionic liquids in dye-sensitized solar cells
• Ionic liquids in protein biophysics
• DNA structure, and stability in ionic liquids
• Electrochemical aspects of ionic liquids
• Ionic liquids in biocatalysis
• Ionic liquids in colloid chemistry
• Ionic liquids in drug delivery
• Application of ionic liquids in dye chemistry