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Exceptions to the Octet Rule02:55

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From Molecules to Materials: Engineering New Ionic Liquid Crystals Through Halogen Bonding
06:44

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Published on: March 24, 2018

Ionic liquids containing boron cluster anions.

Mark Nieuwenhuyzen1, Kenneth R Seddon, Francesc Teixidor

  • 1Queen's University Ionic Liquid Laboratories, The Queen's University of Belfast, David Keir Building, Stranmillis Road, Belfast, Northern Ireland, UK.

Inorganic Chemistry
|January 9, 2009
PubMed
Summary
This summary is machine-generated.

New ionic liquids featuring boron cluster anions and imidazolium cations were synthesized. Alkyl chain length significantly impacts thermal properties, leading to room temperature ionic liquids and liquid crystal phases.

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Area of Science:

  • Materials Science
  • Inorganic Chemistry
  • Physical Chemistry

Background:

  • Ionic liquids (ILs) are salts with low melting points, often exhibiting unique properties.
  • Boron cluster anions offer diverse structures and charge distributions for IL design.

Purpose of the Study:

  • To synthesize and characterize novel ionic liquids by combining various boron cluster anions with imidazolium cations.
  • To investigate the influence of cation alkyl chain length and anion structure on the physical and thermal properties of these ILs.

Main Methods:

  • Metathetic reactions were employed for salt synthesis.
  • Systematic variation of 1-alkyl-3-methylimidazolium ([C(n)mim]+) cations (n=2-18).
  • Characterization included melting point, glass transition temperature, thermal stability (TGA), density, viscosity, and crystal structure determination.

Main Results:

  • New low melting point salts were successfully prepared.
  • Melting points correlated with anion type: [Co(C2B9H11)2]- < [C2B9H12]- < [B10Cl10]2- < [B12Cl12]2-.
  • Room temperature ionic liquids ([C(n)mim][Co(C2B9H11)2], n=4-14) exhibited low glass transition temperatures (≥ -34°C).
  • Imidazolium salts with [B10Cl10]2- or [B12Cl12]2- anions (n=16, 18) displayed liquid crystal phases.
  • High thermal stability was observed, with [C2mim]2[B12Cl12] decomposing above 480°C.

Conclusions:

  • Alkyl chain length is crucial for achieving room temperature ionic liquids, likely due to packing inefficiency.
  • Specific boron cluster anions and imidazolium cations can yield ILs with tunable thermal properties and liquid crystalline behavior.
  • The synthesized compounds, particularly those with perhalogenated anions, demonstrate exceptional thermal stability.