Fluorophore-Appendant 5,5′-Bicalixarene Scaffolds for Host-Guest Sensing of Nitric Oxide

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Abstract

Conjugated 5,5′-Bicalixarene scaffolds having fluorophores at the chain termini have been prepared and tested in the supramolecular detection of nitric oxide. Scaffolds bearing electron-rich fluorophores demonstrated a stronger turn-off response to the presence of NO than the fluorophore-free analogue in both organic and aqueous media, while no fluorescence quenching happened when the electron-deficient fluorophores were employed. Unprecedented ratiometric supramolecular sensing was observed when fluorophores of the opposite electronic demands were placed at the scaffold's termini.

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Baheti, A., Dobrovetsky, R., & Vigalok, A. (2020). Fluorophore-Appendant 5,5′-Bicalixarene Scaffolds for Host-Guest Sensing of Nitric Oxide. Organic Letters, 22(24), 9706–9711. https://doi.org/10.1021/acs.orglett.0c03764

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