Journal
MOLECULES
Volume 26, Issue 8, Pages -Publisher
MDPI
DOI: 10.3390/molecules26082352
Keywords
macrocyclic polyamine; metallo-receptor; fluorescence; chloride sensing
Funding
- Spanish MICINN
- MEC
- FEDER funds from the European Union [PID2019-110751RB-I00, CTQ2016-78499-C6-1-R, CTQ2017-90852-REDC]
- FEDER funds from the European Union (Unidad de Excelencia Maria de Maeztu) [MDM-15-0538]
- Italian Ministero dell'Istruzione dell'Universita e della Ricerca (MIUR) [2017EKCS35]
- Generalitat Valenciana
- European Social Fund [APOSTD2019]
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The scorpionate Zn2+ complex can selectively recognize chloride anions, leading to visible changes in fluorescence emission under a 365 nm UV lamp. This recognition process involves the intramolecular displacement of the PyPD unit by chloride anions, as revealed by absorption, fluorescence, and NMR spectroscopy. Additionally, since the chromophore remains in the system after the recognition event, the fluorescence can be easily restored by eliminating the bound chloride anion.
A scorpionate Zn2+ complex, constituted by a macrocyclic pyridinophane core attached to a pendant arm containing a fluorescent pyridyl-oxadiazole-phenyl unit (PyPD), has been shown to selectively recognize chloride anions, giving rise to changes in fluorescence emission that are clearly visible under a 365 nm UV lamp. This recognition event has been studied by means of absorption, fluorescence, and NMR spectroscopy, and it involves the intramolecular displacement of the PyPD unit by chloride anions. Moreover, since the chromophore is not removed from the system after the recognition event, the fluorescence can readily be restored by elimination of the bound chloride anion.
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