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Design and synthesis of a turn-off fluorescent sensor based on a multifunctional Zn(II) coordination polymer for the detection of Fe3+, Hg2+ and 4-nitrophenol.
- Source :
- CrystEngComm; 3/7/2024, Vol. 26 Issue 9, p1319-1327, 9p
- Publication Year :
- 2024
-
Abstract
- A new π-conjugated bridging-type dicarboxylic acid with a functional alkynyl group, 4,4′-(ethynylimino)bis[benzoic acid] (H<subscript>2</subscript>L), was designed and synthesized to construct a Zn(II)-based coordination compound [ZnL(dpa)]<subscript>n</subscript> (dpa = 4,4′-dipyridylamine). Compound 1 has two-dimensional layers with alkynyl groups protruding on each side of the layer. The introduction of the ligand dpa ensured the existence of uncoordinated nitrogen atoms. Through Hg⋯C (alkynyl group) and Hg⋯N (amino group) coordination interactions, 1 can effectively detect Hg<superscript>2+</superscript> ions (K<subscript>sv</subscript> = 1.34 × 10<superscript>4</superscript> M<superscript>−1</superscript> and LOD = 3.75 × 10<superscript>−4</superscript> mM) by fluorescence quenching. Meanwhile, for Fe<superscript>3+</superscript>, in addition to the coordination interactions between Fe<superscript>3+</superscript> ions and the uncoordinated amino groups, competitive absorption was the major contributor to the fluorescence quenching of compound 1. Competitive absorption prompted the sensitive sensing of Fe<superscript>3+</superscript> (K<subscript>sv</subscript> = 3.09 × 10<superscript>4</superscript> M<superscript>−1</superscript> and LOD = 1.94 × 10<superscript>−4</superscript> mM) and 4-nitrophenol (K<subscript>sv</subscript> = 7.46 × 10<superscript>4</superscript> M<superscript>−1</superscript> and LOD = 4.32 × 10<superscript>−4</superscript> mM). [ABSTRACT FROM AUTHOR]
Details
- Language :
- English
- ISSN :
- 14668033
- Volume :
- 26
- Issue :
- 9
- Database :
- Complementary Index
- Journal :
- CrystEngComm
- Publication Type :
- Academic Journal
- Accession number :
- 175676249
- Full Text :
- https://doi.org/10.1039/d3ce01174g