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Proceedings Paper

Searching for new luminescent chemosensors for metal ions
Author(s): Luca Prodi; Fabrizio Bolletta; Marco Montalti; Nelsi Zaccheroni
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Paper 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.

Paper Details

Date Published: 3 May 1999
PDF: 12 pages
Proc. SPIE 3602, Advances in Fluorescence Sensing Technology IV, (3 May 1999); doi: 10.1117/12.347554
Show Author Affiliations
Luca Prodi, Univ. degli Studi di Bologna (Italy)
Fabrizio Bolletta, Univ. degli Studi di Bologna (Italy)
Marco Montalti, Univ. degli Studi di Bologna (Italy)
Nelsi Zaccheroni, Univ. degli Studi di Bologna (Italy)

Published in SPIE Proceedings Vol. 3602:
Advances in Fluorescence Sensing Technology IV
Joseph R. Lakowicz; Steven A. Soper; Richard B. Thompson, Editor(s)

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