A New Fluorenone-based Turn-on Fluorescent Al.sup.3+ Ion Sensor

In this paper, we report a turn-on fluorescence sensing of Al.sup.3+ ion using a new fluorenone derivative. The imino derivative of 2-amino-9-fluorenone and mercapto-2-butanone is synthesized and characterized using IR, NMR, and mass spectral techniques. The fluorescence of the compound shows a large enhancement at the addition of Al.sup.3+ ions, and other metal ions show insignificant changes of the fluorescence. The stoichiometry and the binding constant of the complex are reported. The detection limit of the Al.sup.3+ determination by the fluorenone derivative is 5 x 10.sup.-8 M. A visible enhancement of color occurs on illumination of the fluorescent compound - Al.sup.3+ ion complex.
Author(s): S. E. Thangaraj [sup.1] , E. J. Antony [sup.1] , G. T. Selvan [sup.2] , P. M. Selvakumar [sup.2] , I. V. M. V. Enoch [sup.1] [sup.2] Author Affiliations: [...]