The ratiometric detection and mechanism of three typical phosphonates by quercetin-based fluorescent probe with low detection limits

摘要: Abstract Phosphonates are efficient corrosion and scale inhibitors commonly used in industrial circulating water systems. However, conventional detection methods cannot accurately detect their concentration some bodies sludge because of low concentration. In this study, a ratiometric fluorescent probe was constructed based on quercetin (QC) divalent zinc ion (Zn2+) to comparatively three typical phosphonates for the first time. Compared with naked QC, Zn2+-quercetin complex (ZnQC) designed shows considerable differences terms luminescence properties surface morphology. When QC Zn2+ were 10 mM 50 μM, limits ATMP, HEDP, DTPMPA 0.223, 0.205 0.152 μM, respectively, which lower than corresponding values obtained through chromatography method phosphomolybdenum blue spectrophotometry. Moreover, time, quantitative analysis molecular surface, basin analysis, atoms molecules (AIM) non-covalent interaction (NCI) Multiwfn program employed investigate binding sites Zn2+. The electron excitation further analyzed via theoretical calculations dependent density functional theory (DFT) time-dependent (TDDFT). mechanism can be ascribed static quenching considering formation non-fluorescent ground-state complexes. Additionally, demonstrated features such as high sensitivity, selectivity, simpler operation has been applied practical samples satisfactory results.