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Related Concept Videos

Micelles01:30

Micelles

Micelle formation is an intricate process that hinges on the properties of amphiphilic or amphipathic molecules and the conditions of the system in which they are found. Amphiphilic molecules, which have both hydrophilic (water-attracting) and hydrophobic (water-repelling) parts, play a critical role in this process.In aqueous environments, these molecules arrange themselves such that their hydrophilic heads are turned towards the water phase, while their hydrophobic tails are oriented away...
Ionic Crystal Structures02:42

Ionic Crystal Structures

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Most monatomic ions behave as charged spheres, and their attraction for ions of opposite charge is the same in every direction. Consequently, stable structures for ionic compounds result (1) when ions of one charge are surrounded by as many ions as possible of the opposite...
Intermolecular Forces03:13

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Atoms and molecules interact through bonds (or forces): intramolecular and intermolecular. The forces are electrostatic as they arise from interactions (attractive or repulsive) between charged species (permanent, partial, or temporary charges) and exist with varying strengths between ions, polar, nonpolar, and neutral molecules. The different types of intermolecular forces are ion–dipole, dipole–dipole, hydrogen bonds, and dispersion; among these, dipole–dipole, hydrogen bonds, and dispersion...
Ionic Bonding and Electron Transfer02:48

Ionic Bonding and Electron Transfer

Ions are atoms or molecules bearing an electrical charge. A cation (a positive ion) forms when a neutral atom loses one or more electrons from its valence shell, and an anion (a negative ion) forms when a neutral atom gains one or more electrons in its valence shell. Compounds composed of ions are called ionic compounds (or salts), and their constituent ions are held together by ionic bonds: electrostatic forces of attraction between oppositely charged cations and anions.
The Colloidal State01:29

The Colloidal State

The formation of a colloidal system is exemplified by an aqueous solution containing Cl− ions is introduced to another containing Ag+ ions, resulting in the precipitation of solid AgCl as extremely tiny crystals. Instead of settling out as a filterable precipitate, these crystals remain suspended in the liquid, showcasing a colloidal system.A colloidal system involves colloidal particles within the approximate range of 1 to 1000 nm in at least one dimension, dispersed in a medium called the...
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From Molecules to Materials: Engineering New Ionic Liquid Crystals Through Halogen Bonding
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Published on: March 24, 2018

Protic ionic liquids with fluorous anions: physicochemical properties and self-assembly nanostructure.

Yan Shen1, Danielle F Kennedy, Tamar L Greaves

  • 1CSIRO Materials Science and Engineering(CMSE), Bag 10, Clayton, Vic. 3169, Australia.

Physical Chemistry Chemical Physics : PCCP
|May 10, 2012
PubMed
Summary

This study introduces novel protic ionic liquids (PILs) with fluorous anions, revealing self-assembled nanostructures due to domain segregation. These new fluorous PILs exhibit unique thermal and physicochemical properties.

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Area of Science:

  • Materials Science
  • Ionic Liquids
  • Supramolecular Chemistry

Background:

  • Protic ionic liquids (PILs) are salts that are liquid at or near room temperature and are formed by the protonation of a Lewis base.
  • The unique properties of PILs, such as low vapor pressure, high thermal stability, and tunable solubility, make them attractive for various applications.
  • However, the self-assembly and nanostructure of PILs, particularly those incorporating fluorinated components, remain underexplored.

Purpose of the Study:

  • To synthesize and characterize novel protic ionic liquids featuring fluorous anions (FPILs).
  • To investigate the self-assembled nanostructure, thermal phase transitions, and physicochemical properties of these FPILs.
  • To explore the impact of fluorocarbon domains on the properties and behavior of PILs.

Main Methods:

  • Synthesis of 11 new FPILs using hydrocarbon amine cations and perfluorinated anions (heptafluorobutyrate and pentadecafluorooctanoate).
  • Small- and wide-angle X-ray scattering (SAXS and WAXS) to determine nanostructure.
  • Differential scanning calorimetry (DSC) for thermal transitions (melting point, glass transition, devitrification).
  • Measurement of physicochemical properties: density, viscosity, surface tension, refractive index, and ionic conductivity.

Main Results:

  • First report of fluorocarbon domains in protic ionic liquids, leading to self-assembled nanostructures in the liquid state.
  • FPILs exhibited diverse thermal behavior, with most being solids at room temperature but melting below 80 °C; two examples were liquids.
  • Physicochemical properties varied significantly, with distinct viscosity and ionic conductivity observed even for liquids with similar densities and surface tensions, attributed to differing nanostructures.

Conclusions:

  • The incorporation of fluorous anions into protic ionic liquids leads to the formation of segregated hydrocarbon and fluorocarbon domains, resulting in unique self-assembled nanostructures.
  • These FPILs display tunable thermal and physicochemical properties, offering potential for new applications.
  • The study highlights the importance of nanostructure in dictating the macroscopic properties of ionic liquids.