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Related Concept Videos

Basicity of Heterocyclic Aromatic Amines01:25

Basicity of Heterocyclic Aromatic Amines

Heterocyclic amines, where the N atom is a part of an alicyclic system, are similar in basicity to alkylamines. Interestingly, the heterocyclic amine having a nitrogen atom as part of an aromatic ring has much less basicity than its corresponding alicyclic counterpart. For this reason, as presented in Figure 1, piperidine (pKb = 2.8) is significantly more basic than pyridine (pKb = 8.8).
Molecular and Ionic Solids02:54

Molecular and Ionic Solids

Crystalline solids are divided into four types: molecular, ionic, metallic, and covalent network based on the type of constituent units and their interparticle interactions.
Molecular Solids
Molecular crystalline solids, such as ice, sucrose (table sugar), and iodine, are solids that are composed of neutral molecules as their constituent units. These molecules are held together by weak intermolecular forces such as London dispersion forces, dipole-dipole interactions, or hydrogen bonds, which...
Ionic Crystal Structures02:42

Ionic Crystal Structures

Ionic crystals consist of two or more different kinds of ions that usually have different sizes. The packing of these ions into a crystal structure is more complex than the packing of metal atoms that are the same size.
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...
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Alkyl Halides

Structural Properties
Alkyl halides are halogen-substituted alkanes wherein one or more hydrogen atoms of an alkane is replaced by a halogen atom such as fluorine, chlorine, bromine, or iodine. The carbon atom in an alkyl halide is bonded to the halogen atom, which is sp3-hybridized and exhibits a tetrahedral shape.
Unlike alkyl halides, compounds in which a halogen atom is bonded to an sp2 -hybridized carbon atom of a carbon-carbon double bond (C=C) are called vinyl halides. Whereas aryl...
Trends in Lattice Energy: Ion Size and Charge02:54

Trends in Lattice Energy: Ion Size and Charge

An ionic compound is stable because of the electrostatic attraction between its positive and negative ions. The lattice energy of a compound is a measure of the strength of this attraction. The lattice energy (ΔHlattice) of an ionic compound is defined as the energy required to separate one mole of the solid into its component gaseous ions. For the ionic solid sodium chloride, the lattice energy is the enthalpy change of the process:
Bond Polarity, Dipole Moment, and Percent Ionic Character02:48

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Bond Polarity

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From Molecules to Materials: Engineering New Ionic Liquid Crystals Through Halogen Bonding
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Pyrazolium- versus imidazolium-based ionic liquids: structure, dynamics and physicochemical properties

Cinzia Chiappe1, Angelo Sanzone, Daniele Mendola

  • 1Dipartimento di Chimica e Chimica Industriale, Università di Pisa, Via del Risorgimento 35, 56126 Pisa, Italy. cinziac@farm.unipi.it

The Journal of Physical Chemistry. B
|December 21, 2012
PubMed
Summary

This study synthesized pyrazolium-based ionic liquids (ILs) and analyzed their properties. Ionic diffusivity and conductivity were found to depend on cation structure and anion type, following the Vogel-Fulcher-Tammann equation.

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Area of Science:

  • Materials Science
  • Physical Chemistry
  • Chemical Engineering

Background:

  • Ionic liquids (ILs) are tunable solvents with unique properties.
  • Pyrazolium cations offer a versatile platform for IL design.
  • Understanding structure-property relationships in ILs is crucial for applications.

Purpose of the Study:

  • To synthesize and characterize novel pyrazolium-based ionic liquids.
  • To investigate the influence of cation structure and anion type on IL properties.
  • To compare pyrazolium ILs with analogous imidazolium-based ILs.

Main Methods:

  • Synthesis and characterization of pyrazolium cations and ILs.
  • Nuclear Magnetic Resonance (NMR) spectroscopy, including NOE and PGSE-NMR.
  • Kamlet-Taft solvatochromic parameters, conductivity, and rheological measurements.
  • Ab initio and Density Functional Theory (DFT) calculations.

Main Results:

  • Conformational states of pyrazolium cations were determined by DFT.
  • Aggregation behavior was sensitive to steric hindrance and anion nature.
  • Ionic diffusivity (D(cation) > D(anion)) and conductivity were measured.
  • Temperature dependencies followed the Vogel-Fulcher-Tammann (VFT) equation.
  • Increased ion association was observed with dicyanamide anions compared to bis(trifluoromethanesulfonyl)imide.

Conclusions:

  • Pyrazolium ILs exhibit tunable properties based on cation and anion choice.
  • Steric hindrance and anion interactions significantly impact IL behavior.
  • The findings provide insights into the design of ILs for specific applications.