Aza-Crown-Ether-Appended Xanthene: Selective Ratiometric Fluorescent Probe for Silver(I) Ion Based on Arene-Metal Ion Interaction

摘要

In this Communication, we report on the development of a ratiometric fluorescent probe for silver(I) ions (Ag~I) based on an arene-metal ion interaction. The probe selectively senses Ag~I among various metal ions with a large-emission red shift under aqueous conditions, enabling the selective ratiometric detection of Ag~I. X-ray crystallography and NMR analyses reveal that Ag~I comes into close contact with the fluorophore, which induces a large-emission red shift. The high sensing selectivity of the probe toward Ag~I might be attributable to the restricted rigid conformation of the cyclic aza crown ether, which exclusively binds Ag~I. In addition to Ag~I sensing, the Ag~I complex of the probe is also used for the ratiometric sensing of a cyanide anion (CN~-), highlighting the utility of the reported probe in fluorescence sensing.