Polydiacetylenes Functionalized with Chelidamic Acid and 2,2'-DipicoIylamine for Colorimetric Responses to Cadmium Ions

摘要

A novel polydiacetylene-linked ligand derived from the reaction between chelidamic acid and bis(pyridin-2-ylmethyl)amine(PDA-CB)showed excellent selectivity and sensitivity for Cd~(2+)ions compared with other metal ions,including Zn~(2+).An obvious color change between PDA-CB and PDA-CB + Cd~(2+)is clearly visible to the naked eye.The Cd~(2+)-responsive color change of PDA-CB is attributed to the coordination between Cd~(2+)and CB ligand units and has been characterized by ~1H NMR titration.