Considerable fluorescence enhancement upon supramolecular complex formation between berberine and p-sulfonated calixarenes

Mónika Megyesi, L. Biczók

Research output: Contribution to journalArticle

65 Citations (Scopus)

Abstract

Remarkably strong binding of berberine to 4-sulfonatocalix[8]arene was found in aqueous solution, which led to fluorescence quantum yield increase of a factor about 40 at pH 2. The hypsochromic shift of the fluorescence maximum implied that berberine sensed less polar microenvironment when confined to SCX8. The stability of the supramolecular complex significantly diminished when sulfocalixarenes of smaller ring size served as host compounds but the pH affected the association strength to a much lesser extent. All berberine complexes proved to be barely fluorescent at pH 12.2 because of excited state quenching by the hosts via electron transfer.

Original languageEnglish
Pages (from-to)71-76
Number of pages6
JournalChemical Physics Letters
Volume424
Issue number1-3
DOIs
Publication statusPublished - Jun 12 2006

Fingerprint

Calixarenes
Berberine
Fluorescence
fluorescence
augmentation
Quantum yield
Excited states
Quenching
electron transfer
quenching
Association reactions
aqueous solutions
Electrons
rings
shift
excitation

ASJC Scopus subject areas

  • Physical and Theoretical Chemistry
  • Spectroscopy
  • Atomic and Molecular Physics, and Optics
  • Surfaces and Interfaces
  • Condensed Matter Physics

Cite this

Considerable fluorescence enhancement upon supramolecular complex formation between berberine and p-sulfonated calixarenes. / Megyesi, Mónika; Biczók, L.

In: Chemical Physics Letters, Vol. 424, No. 1-3, 12.06.2006, p. 71-76.

Research output: Contribution to journalArticle

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