- Anomalous fluorescent responses of 9-fluorenecarboxamide derivatives possessing benzo-15-crown-5.
Anomalous fluorescent responses of 9-fluorenecarboxamide derivatives possessing benzo-15-crown-5.
Analytical sciences : the international journal of the Japan Society for Analytical Chemistry (2007-11-14)
Hiroya Hama, Tatsuya Morozumi, Hiroshi Nakamura
PMID17998741
ABSTRACT
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, (1)H NMR, and (13)C 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).
MATERIALS