A novel fluorescent probe based on cyanoacetyl indole derivative for highly selective and sensitive detection of HPO42−

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).…”

Small-molecule fluorogenic probes based on indole scaffold

“…Based on these characteristics Xiaohua Cai et al designed a novel cyanoacetyl indole-based fluorescent probe 10 for selective detection of HPO 4 2− . 47 Probe 10 was synthesized in two steps; in the first step, indole reacts with cyanoacetic acid to form intermediate 3-cyanoacetlindole, and then a condensation reaction was done between the intermediate and 4-diethylaminosalicylic aldehyde to form the desired probe. The probe showed fluorescence properties in DMSO.…”