“…Additionally, being one of the smallest available fluorophores, its emission spectrum is sensitive to chemical environment, such as pH and polarity [21]. Thus, dansyl-containing small molecular compounds, dendrimers, or polymers were used as fluorescent probes against metal cations, anions, biological materials, and nitro aromatic compounds [19,20,[22][23][24][25] deoxygenated by purging gently with argon and the reaction was carried out at 80°C for 2 h. The reaction was quenched by dipping the flask into a salt-ice mixture, the crude product was dissolved in 10 mL DCM, and precipitated into cold hexane. The precipitation procedure was performed once more, P1 was isolated by filtration, and dried at room temperature in vacuo until a constant weight was obtained.…”