Preparation And Properties Of Tetraphenyl Ethylene Fluorescent Probe

Aggregation induced emission（AIE）is described as a photophysical phenomenon shown by a group of luminogenic materials that are non-emissive when dissolved in good solvents but become highly luminescent when they are clustered in poor solvents as aggregates.As a result,AIE-active materials have a high significance in field of fluorescent sensors.Tetraphenylethylene（TPE）is a typical AIE-active material with splendid aggregation-induced emission properties and can be synthesized using facile methods.In this dissertation,tetraphenylethylene derivative（ETTC-DOAB）was designed and synthesized via ionic self-assembly（ISA）strategy at optimum conditions.The supramolecular structure,phase behaviour,thermal stability and AIE property were elucidated by a combination of experiments.ETTC-DOAB aggregates displayed high fluorescence emission that can be selectively and sensitively quenched on addition of Cu²⁺.The non-emissive display is attributed to the disassembly modulation of the ETTC-DOAB aggregates,indicating ETTC-DOAB is a fluorescence sensor for Cu²⁺detection.Tetraphenylethylene derivative（TPE-COOH）with a strong emissive property was used for rapid ion detection.The emission can be quenched by Cu²⁺due to the dissociation of the TPE-COOH aggregates,offering a simple turn-off fluorescent probe response towards Cu²⁺.The addition of adenosine triphosphate（ATP）into the above solution promoted the re-formation of TPE-COOH aggregates due to the competitive binding tendency of ATP with Cu²⁺,leading to a turn-on fluorescent probe response towards ATP.