Dual signal (color change and fluorescence ON–OFF) ensemble system based on bis(Dpa-CuII) complex for detection of PPi in water

We have developed simple dual signal (color change and fluorescence ON–OFF) ensemble systems based on a bis(Dpa-CuII) complex 1 for the detection of PPi in water. Dual signal takes place because of weak binding and fluorescence quenching effect of coordinatively unsaturated CuII complex for indicators and replacement of the indicators by more strongly binding PPi. As a consequence, these ensembles show a high selectivity and sensitivity for PPi over various anions including phosphate and its derivatives (AMP, ADP, and ATP) in water.