A visible BODIPY-based sensor for ‘Naked-Eye’ recognition of Ag+ and its application on test paper strips

• Published in: Spectrochimica acta. Part A, Molecular and biomolecular spectroscopy Molecular and biomolecular spectroscopy, 2024-01, Vol.304, p.123446, Article 123446
• Main Authors: Li, Shengling, Chang, Xiliang, Kong, Xiangpeng, Wang, Qi, Zhao, Feng, Han, Jia, Liu, Yu, Wang, Tianyuan
• Format: Article
• Language: English
• Subjects: Ag; BODIPY; Colorimetric detection; Fluorescent sensor
• ISSN: 1386-1425
• DOI: 10.1016/j.saa.2023.123446

[Display omitted] •Changes in recognition of sensor TQB for Ag+ can be observed with the naked eye in ambient or ultraviolet light.•The detection limit of sensor TQB is 0.65 μM to Ag+.•Sensor TQB can be applied for recognition of Ag+ in test strips. In this study, a novel, highly sensitive fluorescent sensor (E)-2-((2-(benzo[d] thiazol-2-yl) quinolin-8-yl) oxy)-N’-(4-(5, 5-difluoro-1, 3, 7, 9-tetramethyl-5H-4λ4, 5λ4-dipyrrolo [1, 2-c:2’, 1’-f] [1, 3, 2] diazaborinin-10-yl) benzylidene) acetohydrazide (TQB) was developed for dual mode of Ag+ detection (colorimetric/fluorescence), and its structural and spectral properties were characterized by 1H NMR, ESI-MS, X-ray, ultraviolet and fluorescence photometry. It is found that TQB could specifically and efficiently identify Ag+ among many other metal ions in CH3OH/H2O (7:3 v/v, pH = 7.23) buffer. The maximum absorption wavelength of TQB is red-shifted while its fluorescence is quenched with a quenching rate of 88.7%. The energy difference between TQB and TQB-Ag+ complex was calculated by DFT, and the applicability of TQB was verified by paper strip test. In addition, TQB has been successfully applied to the determination of Ag+ in real water samples with good reversibility and recoveries.