We have developed cross-conjugated X-shaped fluorophores based on benzobisoxazole and benzimidazole nuclei. In these molecules, appropriate substitution of the x- and y-axes results in the spatial isolation of FMOs, leading to predictable and useful sensing response. These systems have been utilized as sensors for carboxylic and boronic acids, phenols, amines, and various anions. More recently, our interest have expandedto the aggregation-induced emission in precursors to porous molecular crystals.
Reviewed in Acc. Chem. Res. 2014, 47, 2074–2083.