Turn-on fluorescent capsule for selective fluoride detection and water purification.

ABSTRACT: It has been a long-standing challenge to develop organic molecular capsules for selective anion binding in water. Here, selective recognition of aqueous fluoride was achieved through triple protonation of a hemicryptophane (L), which is composed of a fluorescent cyclotriveratrylene (CTV) cap and tris(2-aminoethyl)amine (tren) as the anion binding site. Fluoride encapsulation by [3H-L]³⁺ was evidenced by ¹H NMR, ¹⁹F NMR, LC-MS, and X-ray crystallography. In addition, [3H-L]³⁺ exhibited a 'turn-on' fluorescence signal (λ _em = 324 nm) upon fluoride addition. An apparent association constant K _A = (7.5 ± 0.4) × 10⁴ M^-1 and a detection limit of 570 nM fluoride were extracte

SUBMITTER: Lin Y 

PROVIDER: S-EPMC9811533 | biostudies-literature | 2023 Jan

REPOSITORIES: biostudies-literature