• molecular device;
  • logic gate;
  • fluorescence;
  • molecular switch
Thumbnail image of graphical abstract

The cover picture shows A simple-structured 4-(2-pyridylazo)resorcinol (PAR) system whichpresents interesting properties with dual fluorescent outputs. Modulated by solution pH two kinds of reversible switch behaviors, "ON-OFF" and "OFF-ON", were realized with the PAR system. Stimulated by different combination of external stimulus, such as metal ions, UV irradiation and solution pH, the PAR system could perform multiple logic functions including three inputs AND, two inputs INHIBIT and combinatorial "NOR/AND" in parallel. The operation of the designed system is very simple and detected with a high sensitive fluorescent signal.