Multifunctional Cd-CP for fluorescence sensing of Cr(VI), MnO4-, acetylacetone and ascorbic acid in aqueous solutions

Yan-Ning Wang; Hao Xu; Shao-Dan Wang; Meng-Han Zhang; Yi-Tong Wang; Qing-Chen Qiu; Jun-Tai Bai; Yuan Mo; Wu-Yi Feng; Qing-Feng Yang

doi:10.1016/j.saa.2023.122369

Multifunctional Cd-CP for fluorescence sensing of Cr(VI), MnO₄^-, acetylacetone and ascorbic acid in aqueous solutions

Spectrochim Acta A Mol Biomol Spectrosc. 2023 Apr 15:291:122369. doi: 10.1016/j.saa.2023.122369. Epub 2023 Jan 13.

Authors

Affiliations

¹ College of Chemistry and Chemical Engineering, Xinyang Normal University, Xinyang, Henan 464000, China. Electronic address: wyn124@163.com.
² College of Chemistry and Chemical Engineering, Xinyang Normal University, Xinyang, Henan 464000, China.
³ Key Laboratory of Pesticide & Chemical Biology of Ministry of Education, College of Chemistry, Central China Normal University, Wuhan 430079, China.
⁴ State Key Laboratory of High-efficiency Utilization of Coal and Green Chemical Engineering, Ningxia University, Yinchuan 750021, China.

PMID: 36657289
DOI: 10.1016/j.saa.2023.122369

Abstract

The development of multifunctional fluorescent chemosensors for the detection of multiple targets remains challenging but of great importance. In this paper, one novel coordination polymer (CP), denoted as [Cd₂(edda)(phen)₂]∙H₂O (compound 1, H₄edda = 5,5' (ethane-1,2-diylbis(oxy)) diisophthalic acid, phen = 1,10-phenanthroline) is successfully designed and prepared under hydrothermal conditions. Structural analysis indicates that compound 1 possesses a one-dimensional (1D) double chain structure, then self-assembles into a three-dimensional (3D) supramolecular framework via π…π interactions between phen molecules. Interestingly, compound 1 is found to be tolerant in wide range of acidic to alkaline aqueous solutions (pH = 2-13). Fluorescent spectral investigations reveal that compound 1 exhibits highly selective and sensitive fluorescence responses toward MnO₄^-, Cr(VI) ions, acetylacetone (acac) and ascorbic acid (AA) by fluorescence quenching in the aqueous phase. The detection limits are in the very low range, reaching μM level for the detection of MnO₄^-, Cr(VI) ions, nM for AA and ppm for acac detection. The distinguished multi-responsive performance suggests compound 1 to be a potential multifunctional probe. Furthermore, the possible quenching mechanisms have also been systematically investigated in this work.

Keywords: Acetylacetone; Ascorbic acid; Coordination polymer; Fluorescent; Heavy metal ions.