C3v-symmetric anion receptors with guanidine recognition motifs for ratiometric sensing of fluoride. Issue 10 (20th January 2016)

• Record Type: Journal Article
• Authors: Kim, Won; Sahoo, Suban K.; Kim, Gi-Dong; Choi, Heung-Jin
• Is Part Of: RSC advances. Volume 6:Issue 10(2016)
• Page Start: 7872
• Page End: 7878
• Publication Date: 2016-01-20
• Subjects: Chemistry -- Periodicals; 540.5
• DOI: 10.1039/c5ra26039f
• Languages: English
• ISSNs: 2046-2069

Abstract

Abstract : Two new tripodal receptors3 and4 derived from a trindane framework having guanidine groups acting as hydrogen bond acceptors are synthesized and characterized for the selective recognition of anions. Abstract : Two new tripodal receptors3 and4 derived from a trindane framework having guanidine groups acting as hydrogen bond acceptors are synthesized and characterized for the selective recognition of anions. The anion recognition ability of the receptors was evaluated by UV-vis absorption, fluorescence and 1 H NMR methods. Both the receptors showed F − selective ratiometric chromogenic and fluorogenic responses among the tested anions due to the host–guest complexation followed by the abstraction of the amide-NH protons supported by the 1 H NMR titration study. Receptor4 with the naphthalene fluorophore units showed higher F − selectively than the receptor3 by giving visually detectable blue fluorescence and significant turn-on fluorescence at 410 nm which can be switched back and forth by successive addition of F − and H + . Further, the reversible and reproducible fluorescence state of4 can be applied to design a molecular-scale sequential memory unit displaying "Write–Read–Erase–Read" functions in the form of binary logic.