Anomalous fluorescent responses of 9-fluorenecarboxamide derivatives possessing benzo-15-crown-5.
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).
Hama
Hiroya
H
Division of Environmental Material Science, Graduate School of Environmental Science, Hokkaido University, Sapporo, Japan.
Morozumi
Tatsuya
T
Nakamura
Hiroshi
H
D000081:Acetamides / Q000737:chemistry*; D001554:Benzene / Q000737:chemistry*; D002413:Cations, Divalent / Q000737:chemistry; D043844:Crown Ethers / Q000737:chemistry*; D005449:Fluorenes / Q000737:chemistry*; D008670:Metals / Q000737:chemistry; D015394:Molecular Structure; D013050:Spectrometry, Fluorescence / Q000379:methods*
D000081:Acetamides; D002413:Cations, Divalent; D043844:Crown Ethers; D005449:Fluorenes; D008670:Metals; C042148:15-crown-5; C041509:fluorene; D001554:Benzene