A novel reversible fluorescent probe for sequential detection of Al3+ and HPO42− based on caffeic acid and its applicability in cell imaging

Multifunctional Lanthanide Metal–Organic Frameworks Are Used for Fluorescence Sensing of Bi3+, HPO42–, Flu, and PNBA and Application

“…And it conforms to the Stern–Volmer ( I 0 / I = 1 + K SV [M]) equation when the HPO 4 2– concentration was in the range of 20.0 to 55.0 μM, where I 0 was the initial luminescence intensity, I was the luminescence intensity after the addition of HPO 4 2– , [M] was the concentration of HPO 4 2– , and K SV was the Stern–Volmer constant. The linear relationship was y = −12655.1836 x – 0.0630, R 2 = 0.9934, and the detection limit was 7.8 × 10 –8 M (Figure a), which was lower than what has been reported in the literature. − In the anti-interference experiment, we found that the presence of other anions did not affect the response of complex 1 to HPO 4 2– (Figure b). In addition, we conducted cyclic testing on complex 1 and found that its fluorescence intensity could be restored after four cycles after repeated washing (Figure S8c).…”