DOI: 10.1039/A900424F
(Paper)
J. Chem. Soc., Perkin Trans. 2, 1999, 393-398
Synthesis and metal ion-sensing properties of fluorescent PET chemosensors based on the 2-phenylimidazo[5,4-a]anthraquinone chromophore
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Katsuhira Yoshida, Takayoshi Mori, Shigeru Watanabe, Hideki Kawai and Toshihiko Nagamura
Abstract
Novel fluorescent chemosensors in which an aza-crown is linked to a 2-phenylimidazoanthraquinone fluorophore by a methylene spacer have been synthesized for the sensing of metal cations. A dramatic fluorescence enhancement at 515 nm was observed upon binding of the metal ions, which was interpreted in terms of the control of a photoinduced electron transfer (PET) process. This system can recognize the charge and the size of alkali and alkaline-earth metal cations and can transform its information sensitively and precisely into the magnitude of the enhanced fluorescence.