Back to Search
Start Over
Vapoluminescent thin-film with unsaturated copper(I) complex for rapid light-on sensing of N-heteroaromatic vapour.
- Source :
- Journal of Materials Chemistry C; 2/7/2024, Vol. 12 Issue 5, p1799-1808, 10p
- Publication Year :
- 2024
-
Abstract
- A light-on sensor that could detect N-heteroaromatic vapour by luminescence was fabricated using a coordinatively unsaturated Cu(I) complex [CuI(xantphos)] (xantphos = 4,5-bis(diphenylphosphino)-9,9-dimethylxanthene, Cu-x). The vapoluminescent thin film, Cu-x@PVP was prepared using Cu-x and polyvinylpyrrolidone (PVP) via spin-coating. When the hardly emissive film was exposed to pyridine (py) vapour, it emitted bright blue-green luminescence immediately (≦15 s), while on exposure to 2-methylpyrazine (Mepyz), yellow emission occurred. By taking up vapour molecules, four-coordinate Cu(I) complexes with intense luminescence originating from thermally activated delayed fluorescence (TADF) are rapidly produced, as evidenced from both spectroscopy and computational studies. The unsaturated structure of Cu-x enabled a rapid response to vapour based on the ligand addition reaction compared to previous vapochromic Cu(I) complex systems based on the ligand-exchange reaction. Cu-x@PVP was easily recovered by the release of vapour molecules in the air, indicating a reversible vapochromic behaviour. X-ray diffraction measurements indicated a reversible transformation from the triangular Cu-x to the tetrahedral species [CuI(L)(xantphos)] (Cu-x–L; L = py, Mepyz) by the coordination/dissociation of the N-heteroaromatic vapour molecules. The efficient vapour response for the thin film was confirmed compared with that of the bulk powder: The apparent rate constant to the vapochromic response, k<subscript>obs</subscript>, was estimated to be 3 × 10<superscript>−2</superscript> s<superscript>−1</superscript> for Cu-x@PVP based on the emission intensity evolution by the Mepyz vapour, which was approximately six times larger than that of the Cu-x powder sample (k<subscript>obs</subscript> = 5 × 10<superscript>−3</superscript> s<superscript>−1</superscript>). The results demonstrate that the utilisation of the coordinatively unsaturated Cu(I) complex provides a promising strategy for the easy sensing of toxic vapours, such as N-heteroaromatics. [ABSTRACT FROM AUTHOR]
Details
- Language :
- English
- ISSN :
- 20507526
- Volume :
- 12
- Issue :
- 5
- Database :
- Complementary Index
- Journal :
- Journal of Materials Chemistry C
- Publication Type :
- Academic Journal
- Accession number :
- 175162330
- Full Text :
- https://doi.org/10.1039/d3tc03571a