“Turn-on” fluorescent probe detection of Ca2Â + ions and applications to bioimaging

Based on the coordination reaction between probe and Ca2 + under mild conditions, we herein report a turn-on fluorescent probe which features a rapid signal response time (within 25 s), a good linearity range and a low detection limit (2.70 × 10− 7 M). The application of this fluorescent probe was demonstrated by fluorescent imaging in HeLa cells.80