A pyrene-based fluorescent probe for the fluorescent recognition of copper ions

Abstract Copper ion pollution will cause serious damage to the ecological environment and harm the human body through the enrichment of the food chain. To quickly and accurately detect copper ions, a fluorescence probe L1 with high sensitivity and easy preparation was prepared based on pyrene. In a DMSO buffer solvent (PBS, 0.02 M, pH 7.4, V/V = 9:1), probe L1 may specifically detect Cu 2+ . The anti-interference capability of fluorescent probe L1 in detecting Cu 2+ was examined, demonstrating its good selectivity and sensitivity for copper ions. Within the Cu 2+ concentration range of 0 to 24 μM, the fluorescence intensity of probe L1 at 477 nm exhibited a strong linear correlation (R 2 = 0.986) with Cu 2+ concentration. The limit of detection (LOD) for probe L1 about Cu 2+ was determined using the 3σ/k technique, yielding a value of 1.699 × 10 −2 μM. It is appropriate for the detection of copper ions in near-neutral and alkaline environments.