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A novel ratiometric fluorescent probe HB‐2 based on benzothiazole for hypobromous acid (HBrO) was synthesized and studied. After HBrO was added to the CH3CN‐HEPES solution of the HB‐2, the probe cyclized to form a sulfimine bond, which increased the conjugated degree of the system. The fluorescence emission peak of the reaction system at 447 nm gradually decreased, while the newly generated emission peaks gradually increased at 580 nm. The ratio of the fluorescence intensity at the two wavelengths of 447 nm and 580 nm increased about 234 times. Moreover, it has successfully been used to stain and record microscopy images of 4T1 cells, and the presence of exogenous HBrO could be judged by the change of fluorescence intensity. [ABSTRACT FROM AUTHOR]

The fluorescence behaviors and applications of two water‐soluble imidazolium analogs TPI‐1 and TPI‐2 with D‐π‐A structures have been studied. Compound TPI‐1 possessed the aggregation‐induced emission (AIE) effect, but TPI‐2 not. Moreover, compound TPI‐1 could serve as a fluorescence turn‐on probe for detecting uridine‐5'‐triphosphate (UTP) in living cells by AIE mechanism, while TPI‐2 was able to penetrate into the cell membranes and light up the living cells. [ABSTRACT FROM AUTHOR]

An acid‐treated, oxidized graphitic carbon nitride nanosheets (g‐C3N4 NSs) was successfully synthesized and applied as a fluorescence probe for the detection of hemin based on the inner filter effect (IFE). The results indicated that the fluorescence quenching of g‐C3N4 NSs caused by hemin was attributed to the overlap between absorption spectrum of hemin and emission spectrum of g‐C3N4 NSs. It is confirmed that the g‐C3N4 NSs exhibited a highly sensitive and selective for detection of hemin. Under the optical condition, the fluorescence changing of g‐C3N4 NSs is related to the concentration of hemin ranging from 0.5 – 25 μM with a detection limit of 0.15 μM. Moreover, the fluorescence probe has been successfully applied to detect hemin in human blood. Overall, a novel and efficient fluorescence‐based method was developed supported by g‐C3N4 NSs, which is a promising material for application in sensing and cell imaging. [ABSTRACT FROM AUTHOR]

A turn on fluorescence probe for the rapid detection of hypochlorite (ClO−) was prepared successfully. The detection performances of this probe were studied by virtue of ultraviolet absorption and fluorescence spectroscopy. The results demonstrated that this probe displayed excellent colorimetric and noteworthy fluorescence enhancement after interaction with hypochlorite (ClO−) and showed good selectivity and sensitivity for ClO− over other analytes in solution. Due to the short reaction time, high selectivity and sensitivity, this probe was successfully used in the detection of ClO− in living cells and water samples. [ABSTRACT FROM AUTHOR]