A novel 1,3-diazepine-based fluorescent probe for highly selective detection of Hg2

• Published in: Dyes and pigments Vol. 227; p. 112170
• Main Authors: Aisikaer, Ailipire, Sa, Min, Jin, Yiling, Che, Yuanyuan, Li, Xiaojuan
• Format: Journal Article
• Language: English
• Published: Elsevier Ltd 01.08.2024
• Subjects: 1,3-diazepine; Detection of mercury ion; Fluorescence quench; Fluorescent probe; 1,3-diazepine; Detection of mercury ion; Fluorescence quench; Fluorescent probe
• ISSN: 0143-7208; 1873-3743
• DOI: 10.1016/j.dyepig.2024.112170

A novel 1,3-diazepine based fluorescent probe for Hg2+ has been successfully synthesized and characterized. Comprising a furan and pyridine, the probe L1 is a blue-emitting 1,3-diazepine derivative, which transforms into an imine form with high fluorescent yellow-emitting under alkaline conditions. Fluorescence quench of the probe in ethanol was observed with the addition of Hg2+ aqueous in the presence and absence of other metal ions, with a visible color change from colorless to yellow, and this fluorescence quench can be observed in a wide pH range of 3–11. An important feature for this probe is its high selectivity towards mercury ions for the aqueous-phase detection of Hg2+ over the other competitive metal ions, making the “naked-eye” detection of mercury ions possible. [Display omitted] •A novel 1,3-diazepine fluorophore containing a pyridine, a furan and phenyl was synthesized in two steps using istain as the main raw material.•An important feature for this probe is its high selectivity towards mercury ions for the aqueous-phase detection of Hg2+ over the other competitive metal ions, making the “naked-eye” detection of mercury ions possible.•The probe possessed a large Stokes shift (11313 cm−1 in DMSO: H2O = 1:1, 7142 cm-1 nm in ethanol, 10 μM) and high fluorescence quantum yield (φ = 0.3810 μM in ethanol).