An Extremely Stable Host–Guest Complex That Functions as a Fluorescence Probe for Calcium Ions
作者： Chi-Feng Lin , Yi-Hung Liu , Chien-Chen Lai , Shie-Ming Peng , Sheng-Hsien Chiu
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摘要: Herein, we report a crown ether based molecular cage that forms extremely stable supramolecular complexes with dimethyldiazapyrenium (DMDAP) ions in CD 3 CN through the collaboration of multiple weak C-H···O hydrogen bonds. The very strong binding affinity this host-guest system allows to bleach fluorescence signal DMDAP substantially equimolar solutions at concentrations as low 1×10 -5 M. Remarkably, M solution and is highly selective toward Ca 2+ ions-relative other biologically important Li + , Na K Mg ions-and causes substantial increase intensity solution. As result, cage/DMDAP complex behaves probe for detection
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