Selective sensing of aliphatic biogenic polyamines by a zwitterionic Cd-MOF based on bisimidazole tetracarboxylic acid linker

A Cd-MOF with ca. 43% solvent-accessible volume, synthesized starting from a rationally-designed tetraacid linker (Cd-BBI) based on a bisimidazole featuring concave shapes, serves for efficient sensing of hazardous biogenic polyamines, e.g., spermine, by ‘turn-off’ fluorescence quenching.