Abstract
The development of rapid, convenient, and sensitive methods for selective detection SO2 derivatives is of considerable significance in biomedical research and has become a topical objective. Herein four probes (DS1, DS2, DB1 and DB2) based on π-conjugated indolium/benzoindolium systems were designed for detection bisulfite/sulfite. The results indicated that probes DB1 and DB2 showed rapid response, high selectivity and sensitivity for bisulfite/sulfite anions with significant ratiometric fluorescent signal changes. Moreover, DB1 and DB2 were successfully applied for bioimaging SO2 derivatives in living cells under one- and two-photon confocal laser scanning microscopy. This paradigm provided a promising methodology for the design of ratiometric and two-photon bisulfite/sulfite sensors.
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