A series of new receptor molecules derived from 2, 4, 6, 8-tetraazabicyclo [3.3. 1] nonane-3, 7-dione (propanediurea) is described. These molecules possess a cavity which is defined by two nearly parallel aromatic side walls positioned on top of a bis-urea framework. The resulting “U-shaped” clip molecules are ideal hosts for the complexation of flat aromatic guest molecules. The affinity of these new propanediurea based molecular clips for ...
