A cyanobiphenyl-based ratiometric fluorescent sensor for highly selective and sensitive detection of Zn2

• Published in: Inorganica Chimica Acta Vol. 508; p. 119652
• Main Authors: Bie, Fusheng, Cao, Han, Yan, Peng, Cui, Haizhu, Shi, Yijun, Ma, Jie, Liu, Xuejing, Han, Ying
• Format: Journal Article
• Language: English
• Published: Amsterdam Elsevier B.V 01.08.2020; Elsevier Science Ltd
• Subjects: Crystals; Di-2-picolylamine; Fluorescence; NMR; Nuclear magnetic resonance; Ratiometric; Selectivity; Sensor; Sensors; Single crystals; Spectrum analysis; Stoichiometry; Zn2; Di-2-picolylamine; Fluorescence; Ratiometric; Sensor; Zn2
• ISSN: 0020-1693; 1873-3255
• DOI: 10.1016/j.ica.2020.119652

[Display omitted] •The fluorescent sensor was developed based on cyanobiphenyl and di-2-picolylamine groups.•The sensor demonstrated ratiometric response, high selectivity and sensitivity for the detection of Zn2+.•A 1:1 stoichiometry for BCN-Zn2+ complex was confirmed and the detection limit for Zn2+ was calculated to be 0.77 μM. A novel fluorescent sensor (BCN) based on cyanobiphenyl and di-2-picolylamine (DPA) was designed, synthesized and characterized by the UV–vis absorption, fluorescence spectra and NMR studies. This sensor demonstrated ratiometric response, high selectivity and sensitivity for the detection of Zn2+ without the interference of other metal ions particularly the Cd2+ in HEPES buffer/DMSO solution. The Job's plot, HRMS (high-resolution mass spectroscopy) and single-crystal X-ray diffraction revealed the formation of 1:1 stoichiometry for BCN-Zn2+ complex. The binding constant (Ka) of the complex was determined to be 3.67 × 104 M−1 and the detection limit for Zn2+ was calculated to be 0.77 μM. The entire results certificated that BCN can be an advantageous sensor for Zn2+ detection.