Differences in ion interactions for isoelectronic ionic liquid homologs

Heather Y. Lee, Hideaki Shirota, Edward W. Castner

Research output: Contribution to journalArticlepeer-review

44 Citations (Scopus)


Specific cation-anion interactions for two pairs of isoelectronic ionic liquids (ILs) have been investigated using nuclear Overhauser effect (NOE) 2D NMR methods to explore proximities between ions. The four ILs comprise the bis(trifluoromethylsulfonyl)amide anion paired with the following cations: triethyloctylammonium, (2-ethoxyethoxy)ethyltriethylammonium, triethyloctylphosphonium, and (2-ethoxyethoxy)ethyltriethylphosphonium. Substantial interactions are observed between the anion 19F nuclei and all of the protons on the triethyl chains for each of the four cationic head groups. Significantly different interactions are observed for each of the four cationic tail groups and the anions.

Original languageEnglish
Pages (from-to)1477-1483
Number of pages7
JournalJournal of Physical Chemistry Letters
Issue number9
Publication statusPublished - May 2 2013


  • 2D NMR
  • NOE
  • ion interactions
  • ionic liquid structure

ASJC Scopus subject areas

  • Materials Science(all)
  • Physical and Theoretical Chemistry

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