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Bright ESIPT emission from 2,6-di(thiazol/oxazol/imidazol-2-yl)phenol derivatives in solution, aggregation and solid states.
- Source :
-
Methods and applications in fluorescence [Methods Appl Fluoresc] 2024 Jun 14; Vol. 12 (3). Date of Electronic Publication: 2024 Jun 14. - Publication Year :
- 2024
-
Abstract
- Most luminophores often suffer from the problem of aggregation-caused quenching (ACQ) or fluorescence disappearance in dilute solution. It is significant to bridge the gap between ACQ and AIE. In this work, a facile but effective strategy was proposed for the fabrication of always-on luminophores based on the excited state intramolecular proton transfer (ESIPT) mechanism, and six luminophores emitting bright fluorescence in solution, aggregation and solid states were synthesized from 5-tert-butyl-2-hydroxyisophthalaldehyde. All these ESIPT systems show only keto emission owing to their congested structures which block the breakage of intramolecular hydrogen bond (O-H⋯N) by solvation, and subsequently make enol emission impossible. Three of these luminophores are prone to convert into the corresponding phenolate anions emitting blue-shifted emission, which enable them to sense pH variation in the weakly basic range. Furthermore, white-light emission was achieved by combining two of them which show complementary-color fluorescence, and one of them was utilized for bioimaging of living Hela cells and the high-resolution image was obtained.<br /> (© 2024 IOP Publishing Ltd.)
Details
- Language :
- English
- ISSN :
- 2050-6120
- Volume :
- 12
- Issue :
- 3
- Database :
- MEDLINE
- Journal :
- Methods and applications in fluorescence
- Publication Type :
- Academic Journal
- Accession number :
- 38838704
- Full Text :
- https://doi.org/10.1088/2050-6120/ad5490