Searching for new luminescent chemosensors for metal ions

Luca Prodi; Fabrizio Bolletta; Marco Montalti; Nelsi Zaccheroni

doi:10.1117/12.347554

3 May 1999 Searching for new luminescent chemosensors for metal ions

Luca Prodi, Fabrizio Bolletta, Marco Montalti, Nelsi Zaccheroni

Proceedings Volume 3602, Advances in Fluorescence Sensing Technology IV; (1999) https://doi.org/10.1117/12.347554
Event: BiOS '99 International Biomedical Optics Symposium, 1999, San Jose, CA, United States

Abstract

Aiming to develop new fluorescent chemosensors for biological and environmental applications, we have designed and synthesized new chemical species able to reversibly bind alkali, earth-alkali, and transition metal ions. For signaling the binding of the target analyte, we have inserted in the structure of the chemosensors different luminophores, such as dioxyxanthone derivatives, dansyl derivatives, ruthenium complexes, and hydroxyquinoline derivatives. In solution, the binding is always signaled by pronounced changes in the photophysical properties of the inserted luminophore such as emission wavelength and intensity, and excited state lifetime. The mechanism for the signal transduction strongly depends on the chosen receptor and luminophore moieties, and has been investigated in detail by means of steady state and time resolved spectroscopy. In all cases, the synthesized chemosensors have proved to be chemically and photochemically stable. Good selectivity and affinity has been obtained with different sensors for K⁺, Mg²⁺, Ba²⁺, Zn²⁺, Ni²⁺ and Cu²⁺, even in physiological pH conditions. Moreover the use of an array of these sensors in optodes could lead to the construction of the so called electronic tongues. All these features make these sensors promising candidates for analytical applications.

Citation Download Citation

Luca Prodi, Fabrizio Bolletta, Marco Montalti, and Nelsi Zaccheroni "Searching for new luminescent chemosensors for metal ions", Proc. SPIE 3602, Advances in Fluorescence Sensing Technology IV, (3 May 1999); https://doi.org/10.1117/12.347554

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