An excimer-based, binuclear, on-off switchable calix[4]crown chemosensor

Kuk Kim Sung, Ho Lee Seoung, Yeon Lee Ji, Yong Lee Jin, Richard A. Bartsch, Seung Kim Jong

Research output: Contribution to journalArticlepeer-review

49 Citations (Scopus)


A new fluorescent chemosensor with two different types of cation binding sites on the lower rims of a 1,3-alternate calix[4]arene (1) is synthesized. Two pyrene moieties linked to a cation recognition unit composed of two amide groups form a strong excimer in solution. For 1, the excimer fluorescence is quenched by Pb2+, but revived by addition of K+ to the Pb2+ ligand complex. Thus, metal ion exchange produces an on-off switchable, fluorescent chemosensor. Computational results show that the highest occupied molecular orbital (HOMO) and the lowest unoccupied molecular orbitals (LUMO) of the two pyrene moieties interact under UV irradiation of 1 and its K+ complex, while such HOMO-LUMO interactions are absent in the Pb2+ complex.

Original languageEnglish
Pages (from-to)16499-16506
Number of pages8
JournalJournal of the American Chemical Society
Issue number50
Publication statusPublished - 2004 Dec 22
Externally publishedYes

ASJC Scopus subject areas

  • Catalysis
  • General Chemistry
  • Biochemistry
  • Colloid and Surface Chemistry


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