Principle and the Research Progress of Fluorescent Chemosensors for Cations Recognition

Fluorescent chemosensors received more and more attention because these kinds of chemosensors possess a lot of advantages such as high sensitivity, realize tele-monitor and real-time detection. It was also used as signal output in ion recognition. With the rapid development of host-guest chemistry, a series of fluorescent sensors with good properties have been reported. In this review the research progress of fluorescent chemosensors in terms of recognition principle for ion recognition in resent five years was briefly reviewed based on intramolecular charge transfer (ICT), photoinduced electron transfer (PET), fluorescence resonance energy transfer (FRET), excited-state intramolecular proton transfer (ESIPT), monomer-excimer (EM) and chelation-enhanced fluorescence (CHEF), etc. The developing orientation for further research is presented.