Abstract
The real time pH monitoring is crucial for human body health and environmental protection. In this work, a triphenylamine-conjugated TPA-SA (triphenylamine (TPA) and salicylaldehyde (SA)) with ESIPT segment was successfully designed, synthesized and further applied in pH detection bearing larger Stoke shift. Optical properties indicated that the sensor TPA-SA displayed obvious AIE (aggregation induced emission) phenomenon in DMSO/H2O (1/1, v/v) mixed solution, nano-scaled granular-like aggregates of TPA-SA could be obtained through scanning electron microscope images (SEM) and dynamic light scattering (DLS). It was worth mentioning that TPA-SA showed excellent fluorescence reaction to changes in pH, and pKa was calculated to be 4.75. In addition, due to its special optical properties, the further practical application of sensor TPA-SA was successfully conducted in pH sensing strips, information storage and the fluorescence cell imaging in HeLa cells, which may be commercially used in near further.
Published Version
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