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A bis(half-salamo)-type chemosensor  L PBHSbased on phenanthroline, which can identify multiple targets continuously, was synthesized. The chemosensor  L PBHSutilizes the N 3 O cavities to combine with metal cations, and further identify the anions after the complexes have been formed. The chemosensor  L PBHShas an  O -phenanthroline unit with excellent luminescence, so that the strong fluorescence of the chemosensor  L PBHScan be observed under 365 nm UV light. The quenching of luminescence occurs after the introduction of Cu 2+  and Co 2+  into the chemosensor  L PBHS, which can be identified in natural light by observing the change in color of the solution with the naked eye. The  L PBHS -Cu 2+complex further recognizes HSˉ and PPi (pyrophosphoric acid), and strong luminescence are also observed under UV light after the addition of HSˉ and PPi to  L PBHS -Cu 2+. HSˉ and PPi can also be identified by the change in color of the solution under natural light with the naked eye. Using the strong fluorescence emission of  L PBHS, a test strip was developed to detect Cu 2+  and Co 2+  rapidly, and the quenching of fluorescence was clearly observed under UV light. HSˉ and PPi can be further identified by the phenomenon of fluorescence recovery after Cu 2+  detection on the test strip.

Sequential multiple-target chemosensor: Co 2+ , Cu 2+ , PPi, and HSˉ discrimination by a bis(half-salamo)-type probe