Journal
CHEMOSENSORS
Volume 10, Issue 3, Pages -Publisher
MDPI
DOI: 10.3390/chemosensors10030107
Keywords
phosphorous corrole fluorophores; nitrite detection; optical chemical sensor; silica nanoparticles
Funding
- Department of Chemical Sciences and technologies of Tor Vergata University (project ORIENTATE 2021)
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Two phosphorous (V) corrole complexes were synthesized and tested as nitrite-sensitive fluorophores. The selective fluorescence quenching ability of both complexes upon addition of NO2- ions was demonstrated. The functionalization of the optode's lipophilic sites was found to influence its response. These sensors were proven suitable for nitrite detection in natural waters.
Two phosphorous (V) corrole complexes, [5,10,15-pentafluorophenyl corrole] phosphorous (V) (PFCorr) and [10-(4-trimethylsilylphenyl)-5,15-dimesityl-corrole] phosphorous (V) (PCorr) were synthesized and tested as nitrite-sensitive fluorophores. Fluorimetry studies on ligand sensitivity towards anions were carried out in solution, then inside polymeric membrane optodes deposited on glass, and finally by functionalized SiO2 nanoparticles deposited on a paper support. The selective fluorescence quenching was registered upon addition of an increasing amount of NO2- ions for both ligands. The influence on the PFCorr optode's response of the lipophilic sites' functionalization was investigated. The sensors' suitability for nitrite assessment in natural waters at levels 10-fault lower than the WHO's recommended maximum concentration level of 3 mg/L was demonstrated.
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