Analytical Sciences

Abstract − Analytical Sciences, 23(11), 1257 (2007).

Anomalous Fluorescent Responses of 9-Fluorenecarboxamide Derivatives Possessing Benzo-15-crown-5
Hiroya HAMA,* Tatsuya MOROZUMI,** and Hiroshi NAKAMURA**
*Division of Environmental Material Science, Graduate School of Environmental Science, Hokkaido University, Sapporo 060-0810, Japan
**Section of Materials Science, Research Faculty of Environmental Earth Science, Hokkaido University, Sapporo 060-0810, Japan
A new fluorescent ionophore for alkaline earth metal ions, 4′-(9-fluorenecarboxamido)benzo-15-crown-5 (3), was synthesized; its photochemical behavior was investigated using UV, fluorescence, 1H NMR, and 13C NMR spectrometry. In the absence of a metal ion, the fluorene moiety showed weak fluorescence emission (fluorescence “Off” state). However, complexation with metal ions greatly enhanced the fluorescence intensity (fluorescence “On” state).