“…The recognition process by fluoroionophores takes place by their ionophore part which is then converted to a change in the fluorophore's signal, brought about by the perturbation of such photoinduced processes as energy transfer, charge transfer, electron transfer, formation or disappearance of eximers and exciplexes [6,12,13]. In recent years, several fluorescence sensors have been developed for the detection of transition and heavy metal ions including Ag + [12], Ni 2+ [14], Cu 2+ [15,16], Pb 2+ [17,18], Cd 2+ [19], Hg 2+ [20,21] and Fe 3+ [22,23].…”