A symmetric bis(salamo)-like fluorescent chemosensor for identifying HCO₃^- and CO₃^2- and its application

In this work, we successfully designed and synthesized a methoxydisubstituted bis(salamo)-type fluorescent chemical sensor BS, which can be applied as a highly sensitive and selective fluorescence probe for HCO₃^- and CO₃^2- detection. The LODs of HCO₃^- and CO₃^2- were experimentally calculated to be 5.4068 × 10^-8 M and 4.4517 × 10^-8 M, respectively. After relevant experiments, the sensing mechanism was investigated. Moreover, the application of the sensor in practice is explored, and the sensor BS can be loaded on portable test strips for ion detection. In the field of ion detection, salamo-like chemical sensors have been less studied compared to other sensor molecules, especially for the recognition and detection of anions. Therefore, this study will to some extent contribute to expanding the application of salamo-like compounds.