Abstract
A new coumarin derivative containing piperazine and imidazole moieties is reported as a fluorophore for hydrogen ions sensing. The fluorescence enhancement of the studied sensor with an increase in hydrogen ions concentration is based on the hindering of photoinduced electron transfer from the piperazinyl amine and the imidazolyl amine to the coumarin fluorophore by protonation. The presented sensor has a novel design of fluorophore-spacer-receptor(1)-receptor(2) format, which is proposed to sense two ranges of pH (from 2.5 to 5.5) and (from 10 to 12) instead of sensing one pH range. A model compound, in which the piperazinyl ring is absent, was synthesized as well to confirm the novel pH sensing of the proposed sensor.
Original language | English |
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Pages (from-to) | 818-822 |
Number of pages | 5 |
Journal | Spectrochimica Acta - Part A: Molecular and Biomolecular Spectroscopy |
Volume | 71 |
Issue number | 3 |
DOIs | |
Publication status | Published - Dec 1 2008 |
Externally published | Yes |
Keywords
- Coumarin
- Fluorescent multiple pH sensor
- Imidazole
- Photoinduced electron transfer (PET)
- Piperazine
ASJC Scopus subject areas
- Analytical Chemistry
- Atomic and Molecular Physics, and Optics
- Instrumentation
- Spectroscopy