A novel calixarene derivative locked in the 1,3-alternate conformation (2) bearing two pyrene and rhodamine fluorophores was synthesized as a selective sensor for the Hg2+ ion. The sensoring is based on FRET from pyrene excimer emissions to ring-opened rhodamine absorption upon complexation of the Hg2+ ion. Addition of Hg2+ to a mixed solution of 2 gave significantly enhanced fluorescence at ∼576 nm via FRET with excitation at 343 nm. We also found that the pyrene excimer emissions formed by the intramolecular π-π interactions are more effective in obtaining strong FRET bands than those by intermolecular π-π interactions.
|Number of pages||7|
|Journal||Journal of Organic Chemistry|
|Publication status||Published - 2010 Nov 5|
ASJC Scopus subject areas
- Organic Chemistry