Abstract
A novel and efficient fluorescent sensor with a pyrazine triphenylamine unit was developed. The sensor exhibits large Stokes shift (216 nm) due to the excited-state intramolecular proton transfer (ESIPT) process. After complexing with Cu2+, the ESIPT process was blocked and the fluorescence of the sensor was quenched. Job's plot and ESI-MS results indicated that the stoichiometric ratio between the sensor and Cu2+ was 1:1. The detection limit was determined to be 2.47 × 10−8 mol L−1. The sensor could be used to detect Cu2+ in practical samples with high accuracy. Furthermore, the sensor also could be made into test paper strips for the qualitative and quantitative detection of Cu2+.
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