A colorimetric and reversible fluorescent chemosensor for Ag~+ in aqueous solution and its application in IMPLICATION logic gate

摘要

In this work, a new phenazine-based derivative (L-1) which based on 2,3-diamino-phenazine and 5-(4-chlorphenyl)-2-furaldehyde was designed to act efficiently in a chemodosimeter approach for the rapid and selective detection of silver ion in aqueous solution over a wide pH range. The addition of Ag~+ to an aqueous solution of L-1 induced a change in the solution color from yellow to shallow orange and fluorescent quenching, indicating that L-1 could act as an excellent ON-OFF-type fluorescent chemosensor for Ag~+. With a detection limit of 3.25 × 10~(-7) M, the chemosensor shows great potential to monitor Ag~+ in environmental analysis systems. Furthermore, this sensor can serve as a recyclable component in sensing materials.These properties make L-1 act as an accurate Ag~+ controlled ON-OFF-ON fluorescence switch and implication (IMP) function logic gate. In addition, the actual usage of sensor L-1 was further demonstrated by test kits and silica gel plates. Notably, the stoichiometry of the complexes between the sensor and Ag~+ is indicative of a 2:1 ratio which was determined by a Job's plot yielded from fluorescence titrations. And the mode of interaction between Ag~+ ions and L-1 has been supported by ~1H NMR spectroscopy and mass spectrometry studies.