A stable cationic Cd(II) coordination network as bifunctional chemosensor with high sensitively and selectively detection of antibiotics and Cr(VI) anions in water

• Published in: Journal of solid state chemistry 2021-06, Vol.298, p.122117, Article 122117
• Main Authors: Li, Bei, Lei, Qingjuan, Wang, Feng, Zhao, Dongsheng, Deng, Yuxin, Yang, Lulu, Fan, Liming, Zhang, Zhengguo
• Format: Article
• Language: English
• Subjects: Antibiotic detection; Bifunctional chemosensor; Cationic MOFs; Chromium(VI) detection; Fluorescent sensing
• ISSN: 0022-4596; 1095-726X
• DOI: 10.1016/j.jssc.2021.122117

A stable Cd(II) based luminescence coordination polymer, {[Cd(tib)2](NO2)2·0.5DMA·H2O}n (CdCP, tib ​= ​1,3,5-tris(1-imidazolyl)benzene), containing the 2D {4^3}2{4^6.6^6.8^3}-kgd cationic sheet, has been successfully obtained and applied as an efficient and versatile chemical sensor. Fluorescence sensing experiments revealed that CdCP displays high sensitivity and selectivity for detecting inorganic Cr(VI) anions and nitrofuran/nitroimidazole antibiotics (ABXs) in aqueous solutions via luminescence quenching effects. In addition, the mechanisms of fluorescent quenching were discussed based on optical spectroscopy and quantum chemical calculation, which indicated that the quenching mechanisms involving internal filter effect (IFE) and photo-induced electron transfer (PET). This work provides a meaningful strategy for design multi-responsive cationic MOFs/CPs as chemical sensor in the detection of pollutants in water. [Display omitted] •A stable 2D cationic cadmium (II) CP with throughout reticular channels was successfully designed.•CdCP ​act as bifunctional chemosensor in the detection of antibiotics and Cr(VI) anions in water.•The quenching mechanisms were explored from internal filter effect and photo-induced electron transfer viewpoints.