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Luminescent covalent organic framework as a recyclable turn-off fluorescent sensor for cations and anions in aqueous solution.
- Source :
- Journal of Materials Chemistry C; 10/14/2019, Vol. 7 Issue 38, p11919-11925, 7p
- Publication Year :
- 2019
-
Abstract
- Covalent organic frameworks (COFs) have shown great potential for use in ion sensing; however, applications of existing COFs are limited to sensing either cations or anions. In this study, a three-dimensional COF, COF-TT, is constructed by reacting the bis(tetraoxacalix[2]arene[2]triazine) core with tetra(p-aminophenyl)methane to provide a luminescent sensor. COF-TT exhibits ultrahigh thermal stability and exceptional chemical stability in aqueous solutions over a broad pH range from 2 to 14, which signifies immense practical potential for sensing applications. Excellent selectivity and high sensitivity of COF-TT toward Fe<superscript>3+</superscript> cations and CrO<subscript>4</subscript><superscript>2−</superscript>, Cr<subscript>2</subscript>O<subscript>7</subscript><superscript>2−</superscript>, and MnO<subscript>4</subscript><superscript>−</superscript> anions are evident via luminescence quenching. COF-TT also exhibits excellent recyclability in terms of washing and re-exposure cycles. Both experimental data and theoretical calculations are employed to unveil the mechanisms of the quenching effect and sensing properties of COF-TT. [ABSTRACT FROM AUTHOR]
Details
- Language :
- English
- ISSN :
- 20507526
- Volume :
- 7
- Issue :
- 38
- Database :
- Complementary Index
- Journal :
- Journal of Materials Chemistry C
- Publication Type :
- Academic Journal
- Accession number :
- 138912945
- Full Text :
- https://doi.org/10.1039/c9tc03265g