Zn- and Cd-based Coordination Polymers Offering H-Bonding Cavities: Highly Selective Sensing of S2 O7 2- and Fe3+ Ions.

We present two ZnII - and CdII -based coordination polymers (CPs), L-Zn and L-Cd, offering H-bonding-based cavities of varying dimensions. Both CPs were used for the highly selective detection of S2 O7 2- and Fe3+ ions where H-bonding based cavities played an important role. Fluorescence quenching, competitive binding studies and binding parameters substantiated significant recognition of S2 O7 2- and Fe3+ ions by both CPs.