| Summary: | Two phosphorous (V) corrole complexes, [5,10,15-pentafluorophenyl corrole] phosphorous (V) (<b>PFCorr</b>) and [10-(4-trimethylsilylphenyl)-5,15-dimesityl-corrole] phosphorous (V) (<b>PCorr</b>) 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 SiO<sub>2</sub> nanoparticles deposited on a paper support. The selective fluorescence quenching was registered upon addition of an increasing amount of NO<sub>2</sub><sup>−</sup> ions for both ligands. The influence on the <b>PFCorr</b> 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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