Structural dependence of the selectivity of fluorescent chemosensors to Mg2+ from alkali earth metal ions

Abstract

A series of novel 2,2′-bipyridylene-containing conjugated polymers are synthesized through the Wittig reaction. Some of these polymers show a highly selective affinity toward Mg2+ in a mixture of alkaline earth metal ions, which is different from the 2,2′-bipyridylene-containing poly(phenylene vinylene) derivatives reported previously. This is the first case to demonstrate that some materials show a selectivity toward Mg2+. The structures of the polymers may play a crucial role for this selectivity.