Two Acridone Units in One Crown Ether Incorporating a Second Acridone

We present here a critical overview on the effects of the second heterocyclic subunit in a bisacridino-crown ether by the discussion of its role in modulating optochemical behavior and preference in molecular recognition. The preparation of a new bisacridono-crown ether is presented including synthetic difficulties, and its fluorescence properties and selectivity in formation of inclusion complexes with various cations are evaluated in the light of reported analogues.