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Published on: August 19, 2013
Calix[4]arene-based, Hg2+ -induced intramolecular fluorescence resonance energy transfer chemosensor
Amel Ben Othman1, Jeong Won Lee, Jia-Sheng Wu
1IPHC-ULP-ECPM-CNRS, 25 rue Becquerel, F-67087 Strasbourg Cédex, France.
Abstract:
A novel calix[4]arene-based chemosensor 1 based on Hg2+-induced fluorescence resonance energy transfer (FRET) was synthesized, and its sensing behavior toward metal ions was investigated by UV/vis and fluorescence spectroscopies. Addition of Hg2+ to a CH3CN solution of 1 gave a significantly enhanced fluorescence at approximately 575 nm via energy transfer (FRET-ON) from the pyrenyl excimer to a ring-opened rhodamine moiety. In contrast, addition of Al3+ induced a distinct increase of pyrenyl excimer emission ( approximately 475 nm), while no obvious FRET-ON phenomenon was observed. Different binding behaviors of 1 toward Hg2+ and Al3+ were also proposed for the interesting observation.
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