Bifunctional Fluorescent Calix[4]arene Chemosensor for Both a Cation and an Anion
The Journal of Organic Chemistry2005Vol. 70(4), pp. 1463–1466
Citations Over TimeTop 10% of 2005 papers
Abstract
[reaction: see text] A new fluorogenic cone calix[4]triazacrown-5 (1) bearing two pyrene amide groups and its structural analogue 2 have been prepared. Excited at 343 nm, 1 and 2 reveal excimer emissions at 448 and 472 nm, respectively. When heavy metal ions such as Pb(2+) and Co(2+) are bound to 1, the fluorescence intensities of both monomer and excimer are quenched whereas H bonding-assisted F(-) binding to 1 gives rise to a quenched monomer emission with little excimer emission change.
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