Ratiometric nanomolar detection of Cu ~(2+) ions in mixed aqueous media: A Cu ~(2+)/Li ~+ ions switchable allosteric system based on thiacalix[4]crown

摘要

A novel ditopic fluorescent chemosensor 2, based on the 1,3-alternate conformation of thiacalix[4]crown possessing two complexation sites, was synthesized and shows ratiometric nanomolar detection of Cu ~(2+) ions and exhibits negative allosteric behaviour between Cu ~(2+)/Li ~+ ions in mixed aqueous media.