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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.
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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...
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The ionic association is the association of oppositely charged ions in an electrolyte solution to form ion pairs. Bjerrum defined ion pairs as two oppositely charged ions whose electrostatic attraction exceeds the thermal energy of the system, typically expressed as 2kT. Electrostatic attraction depends on ionic charge, separation distance, and the dielectric constant of the medium. Thermal energy, represented by kT, reflects the tendency of ions to move independently due to molecular motion.
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Cation Dynamics in Supercooled and Solid Alkyl Methylimidazolium Bromide Ionic Liquids.

Amin Ordikhani Seyedlar1, Siegfried Stapf1, Carlos Mattea1

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The Journal of Physical Chemistry. B
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Molecular dynamics of ionic liquids reveal temperature-dependent cationic mobility. Below a critical temperature, mobility deviates from Arrhenius behavior, indicating complex dynamics in supercooled and crystalline states.

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Area of Science:

  • Physical Chemistry
  • Materials Science
  • Chemical Physics

Background:

  • Ionic liquids (ILs) exhibit unique properties due to their ionic nature.
  • Understanding the molecular dynamics of ILs is crucial for their application in various fields.
  • Alkyl methylimidazolium bromides are a common class of ILs with tunable properties.

Purpose of the Study:

  • To investigate the temperature dependence of cationic mobility in alkyl methylimidazolium bromide ionic liquids.
  • To explore the transition from supercooled to crystalline states and its impact on molecular dynamics.
  • To elucidate the relationship between molecular dynamics and macroscopic diffusion.

Main Methods:

  • Nuclear Magnetic Resonance Relaxation Dispersion (NMRD) at variable magnetic field strengths.
  • Nuclear Magnetic Resonance Pulsed Field Gradient (PFG) diffusion measurements.
  • Analysis of temperature dependence across supercooled and crystalline states.

Main Results:

  • Cationic mobility follows an Arrhenius dependence at high temperatures.
  • A deviation from Arrhenius behavior is observed below a critical dynamic temperature (Tdyn ≈ 275 K).
  • Macroscopic diffusion coefficient shows Vogel-Fulcher-Tammann (VFT) dependence above Tdyn and a weaker dependence below.
  • Crystalline 1-butyl-3-methylimidazolium bromide (Bmim Br) exhibits significantly enhanced self-diffusion, suggesting dynamic heterogeneity.

Conclusions:

  • Alkyl methylimidazolium bromide ionic liquids display complex molecular dynamics influenced by temperature and phase.
  • The observed deviation from Arrhenius behavior highlights non-Arrhenius dynamics in the supercooled state.
  • Dynamic heterogeneity plays a significant role in the crystalline state, particularly in the presence of impurities like water.