Skip to main page content
U.S. flag

An official website of the United States government

Dot gov

The .gov means it’s official.
Federal government websites often end in .gov or .mil. Before sharing sensitive information, make sure you’re on a federal government site.

Https

The site is secure.
The https:// ensures that you are connecting to the official website and that any information you provide is encrypted and transmitted securely.

Access keys NCBI Homepage MyNCBI Homepage Main Content Main Navigation
. 2024 Jun 20;29(12):2943.
doi: 10.3390/molecules29122943.

A Zn(II) Coordination Polymer for Fluorescent Turn-Off Selective Sensing of Heavy Metal Cation and Toxic Inorganic Anions

Yaxin Li  1 , Mouyi Zhang  1 , Ying Wang  1 , Lei Guan  1 , Di Zhao  1 , Xinyu Hao  1 , Yuting Guo  1
Affiliations

A Zn(II) Coordination Polymer for Fluorescent Turn-Off Selective Sensing of Heavy Metal Cation and Toxic Inorganic Anions

Yaxin Li et al. Molecules. .

Abstract

A novel coordination polymer [Zn(atyha)2]n (1) (Hatyha = 2-(2-aminothiazole-4-yl)-2- hydroxyiminoacetic acid) was constructed by hydrothermal reaction of Zn2+ with Hatyha ligand. CP 1 exhibits a 2D (4,4)-connected topological framework with Schläfli symbol of {44·62}, where atyha- anions serve as tridentate ligands, bridging with Zn2+ through carboxylate, thiazole and oxime groups. CP 1 displays a strong ligand-based photoluminescence at 390 nm in the solid state, and remains significantly structurally stable in water. Interestingly, it can be utilized as a fluorescent probe for selective and sensitive sensing of Fe3+, Cr2O72- and MnO4- through the fluorescent turn-off effect with limit of detection (LOD) of 3.66 × 10-6, 2.38 × 10-5 and 2.94 × 10-6 M, respectively. Moreover, the efficient recyclability for detection of Fe3+ and Cr2O72- is better than that for MnO4-. The mechanisms of fluorescent quenching involve reversible overlap of UV-Vis absorption bands of the analytes (Fe3+, Cr2O72- and MnO4-) with fluorescence excitation and emission bands for CP 1, respectively.

Keywords: coordination polymer; fluorescent; inorganic anion; metal cation; selective sensing.

PubMed Disclaimer

Conflict of interest statement

The authors declare no conflicts of interest.

Figures

Figure 1
Figure 1
(a) A drawing showing the coordination environment about Zn2+; (b) octahedral coordination configuration of Zn2+; (c) 2D-layered structure; (d) 3D supramolecular structure; (e) bridged atyha− ligand-based node; (f) 4-c node of Zn2+; (g) topological structure.
Figure 1
Figure 1
(a) A drawing showing the coordination environment about Zn2+; (b) octahedral coordination configuration of Zn2+; (c) 2D-layered structure; (d) 3D supramolecular structure; (e) bridged atyha− ligand-based node; (f) 4-c node of Zn2+; (g) topological structure.
Figure 2
Figure 2
Fluorescence excitation and emission spectra of (a) free Hatyha ligand and (b) CP 1.
Figure 3
Figure 3
(a) Fluorescence spectra of CP 1 and (b) fluorescence intensities in different solutions of metal ions.
Figure 4
Figure 4
Fluorescence intensities of CP 1 in solutions with different interfering metal ions before and after addition of Fe3+.
Figure 5
Figure 5
(a) Fluorescence responses of CP 1 in solutions with different concentrations of Fe3+ and (b) Stern–Volmer plot.
Figure 6
Figure 6
Recyclability of CP 1 for sensing of Fe3+.
Figure 7
Figure 7
(a) PXRD pattern of CP 1 soaked in Fe3+ solution; (b) UV-Vis absorption spectrum of Fe3+, fluorescence excitation and emission spectra of CP 1.
Figure 8
Figure 8
(a) Fluorescence spectra and (b) fluorescence intensities of CP 1 in different anionic solutions.
Figure 9
Figure 9
Fluorescence intensities of CP 1 in solutions with different interfering anions before and after addition of (a) Cr2O72− and (b) MnO4−.
Figure 10
Figure 10
(a) Fluorescence responses of CP 1 in solutions with different concentrations of Cr2O72− and (b) Stern–Volmer plot.
Figure 11
Figure 11
(a) Fluorescence responses of CP 1 in solutions with different concentrations of MnO4− and (b) Stern–Volmer plot.
Figure 12
Figure 12
Cyclic experiments using CP 1 for detection of (a) Cr2O72− and (b) MnO4−.
Figure 13
Figure 13
(a) PXRD patterns of CP 1 soaked in Cr2O72− and MnO4− solution, respectively; (b) UV-Vis absorption spectra of Cr2O72− and MnO4−, fluorescence excitation and emission spectra of CP 1.
See this image and copyright information in PMC

References

    1. Zhao X.Y., Wu J.F., Tian W. Terbium(III)-based coordination polymer with millimeter-size single crystals and high selectivity and sensitivity for folic acid. CrystEngComm. 2023;25:945–952. doi: 10.1039/D2CE01608G. - DOI
    1. Liu L.J., Zhu H., Han C., Cui G.H., Fu L.S. Luminescent detecting of Fe3+ and Cr2O72− ions by three ternary 2D coordination polymers. Polyhedron. 2021;198:115074. doi: 10.1016/j.poly.2021.115074. - DOI
    1. Zhou H.C., Long J.R., Yaghi O.M. Introduction to metal-organic frameworks. Chem. Rev. 2012;112:673–674. doi: 10.1021/cr300014x. - DOI - PubMed
    1. Barnett B.R., Gonzalez M.I., Long J.R. Recent progress towards light hydrocarbon separations using metal-organic frameworks. Trends Chem. 2019;1:159–171. doi: 10.1016/j.trechm.2019.02.012. - DOI
    1. Zhao Q., Li Q.Y., Li J. Structures, fluorescence and magnetism of a series of coordination polymers driven by a tricarboxypyridine ligand. CrystEngComm. 2022;24:6751–6761. doi: 10.1039/D2CE00726F. - DOI

LinkOut - more resources