Inclusion complexation abilities of cucurbit[6]uril for various aromatic amines in the presence of alkali metal cations

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Abstract

The inclusion complexation of aromatic amines with cucurbit[6]uril (CB[6]) capped with alkali metal cations was studied spectrophotometrically. We showed that CB[6] capped with alkali metal cations forms a 1:1 inclusion complex with the aromatic amine guests (neutral organic molecules), independent of the length of guest molecules. The effects of salts on the inclusion constants of CB[6] in the presence of different alkali salts were examined and it was found that the inclusion constants increased in the order of alkali cation Cs+ < Na+ < K+, suggesting the interaction of amine guests with the capped alkali metal cation. Further, the structures of the inclusion complexation of aromatic amines with CB[6] were characterized by 1H NMR measurements. Based on the results, the inclusion abilities of CB[6] capped with alkali metal cations are discussed.

Original languageEnglish
Pages (from-to)253-257
Number of pages5
JournalJournal of Inclusion Phenomena and Macrocyclic Chemistry
Volume88
Issue number3-4
DOIs
Publication statusPublished - Aug 1 2017

Keywords

  • Cucurbit[6]uril
  • Effects of alkali cations
  • Inclusion behavior
  • Structure of inclusion complex

ASJC Scopus subject areas

  • Food Science
  • Chemistry(all)
  • Condensed Matter Physics

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