The invention discloses a fluorescent probe molecule (I) for detecting acidic pH. The fluorescent probe is prepared by a Sonogashira reaction of a 1,7-dibromo substituted perylene diimide derivative and 4-ethynylaniline. The probe is stable in structure under a strong acid condition, and can be used for detecting the pH value of a solution. Obvious color changes can be observed by a fluorescence spectrophotometer and naked eye. The pH detection range of the fluorescence probe is 1.3 to 2.3. The molecule I has the advantages of mild preparation conditions, simple and convenient reaction steps,high sensitivity and good application prospects. The structural formula of the fluorescent probe molecule (I) is shown in the description.

Preparation and application of perylene diimide pH fluorescent probe

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Preparation and application of perylene diimide pH fluorescent probe