<p>A naphthalimide-based highly selective colorimetric and ratiometric fluorescent probe for the fluoride ion displayed both one- and two-photon ratiometric changes. Upon reaction with the F− (TBA+ and Na+ salts) anion in CH3CN as well as in aqueous buffer solution, probe 1 shows dramatic color changes from colorless to jade-green and remarkable ratiometric fluorescence enhancements signals. These properties are mechanistically ascribed to a fluoride-triggered Si−O bond cleavage that resulted in a green fluorescent 4-amino-1,8-naphthalimide.</p>
J. Feng Zhang, Lim, C. Su, Bhuniya, S., Cho, B. Rae, and Kim, J. Seung, “A Highly Selective Colorimetric and Ratiometric Two-Photon Fluorescent Probe for Fluoride Ion Detection”, Organic Letters, vol. 13, pp. 1190-1193, 2011.