Research On Selective Recognition Chemosensors For Transition Metal Ions

Heavy transition metal (HTM) ions, play significant roles in physiology, or are important contaminants to the environment, or closely relate to other surroundings of human being’s daily life. Consequently, there is an urgency that scientists need to develop more convenient, more accurate methods which can be used in real-time, in vivo and in vitro detection. Compared with electrical and magnetic signaling output, optical signaling output attract more intention, due to its simplicity, high sensitivity and selectivity. From2000, this research area is becoming very popular:more and more chemosensors for detection of cations and anions have been developed, whose properties are better and better, and principles of sensing are explained more exhaustively.The majority of these sensors are based on organic small molecule ligands. By modifying existing dye molecules or constructing new molecule framework, the scientists use these ligands to selectively coordinate with specific metal ions in solutions so that great changes of spectrum are generated, which can be then transformed into optical or electrical signals to achieve selective recognition.Herein, we mainly introduce the ratiometric chemosensor for ferric ion based on a2,2-bithiazole derivative, the OFF-ON chemosensor for zinc ion based on a quinoxaline derivative and the ratiometric chemosensor for znic ion based on a1,10-phenanthroline derivative.