Ionic liquids of chelated orthoborates as model ionic glassformers

Wu Xu, Li Min Wang, Ronald A. Nieman, Charles Angell

Research output: Contribution to journalArticle

182 Citations (Scopus)

Abstract

Ionic liquids based on various chelated orthoborate anions of different N-containing onium cations have been synthesized using an economic synthesis strategy. Most orthoborates do not crystallize. They are found to have much higher glass transition temperatures and room-temperature viscosities than those with perfluorinated anions such as TFSI-, BF4 -, and CF3SO3 - (Tf-), as predicted from anion polarizability arguments. The ambient conductivities of the new ionic liquids are low relative to those with perfluorinated anions. The transport properties all show that cohesion in these liquids increases, and ionic mobilities decrease, as anion size increases, implying that van der Waals interactions, not Coulomb interactions, have become the controlling influence. In view of their resistance to crystallization, the large range of temperature over which these liquids can be studied, their hydrophobic properties, and their high fragilities, these liquids may provide good model systems for fundamental liquid state investigations and interesting solvents for large-molecule dissolution.

Original languageEnglish (US)
Pages (from-to)11749-11756
Number of pages8
JournalJournal of Physical Chemistry B
Volume107
Issue number42
StatePublished - Oct 23 2003

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Ionic Liquids
Ionic liquids
Anions
Negative ions
anions
liquids
Liquids
ionic mobility
Crystallization
Coulomb interactions
cohesion
Transport properties
Cations
Dissolution
glass transition temperature
Positive ions
economics
Viscosity
dissolving
transport properties

ASJC Scopus subject areas

  • Physical and Theoretical Chemistry

Cite this

Ionic liquids of chelated orthoborates as model ionic glassformers. / Xu, Wu; Wang, Li Min; Nieman, Ronald A.; Angell, Charles.

In: Journal of Physical Chemistry B, Vol. 107, No. 42, 23.10.2003, p. 11749-11756.

Research output: Contribution to journalArticle

Xu, W, Wang, LM, Nieman, RA & Angell, C 2003, 'Ionic liquids of chelated orthoborates as model ionic glassformers', Journal of Physical Chemistry B, vol. 107, no. 42, pp. 11749-11756.
Xu, Wu ; Wang, Li Min ; Nieman, Ronald A. ; Angell, Charles. / Ionic liquids of chelated orthoborates as model ionic glassformers. In: Journal of Physical Chemistry B. 2003 ; Vol. 107, No. 42. pp. 11749-11756.
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