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A series of 2-[(9 H -fluoren-2-yl)aryl]-1 H -benzo[ d ]imidazoles  11–13  and 2,7-bis[(1 H -benzo[ d ]imidazol-2-yl)aryl]-9 H -fluorenes  14–16  containing different linking aromatic units were synthesized in good yields. Their absorption and fluorescence properties were investigated in solution and in the solid state. Most compounds possess good fluorescence-emitting ability with  φ  FL  values in the region of 0.31–0.99 in solution and display strong blue emission. Structure–optical behavior characteristics and further details of the electronic properties from cyclic voltammetry measurements and theoretical calculations are discussed.

heterocyclic communications

Synthesis, optical and electrochemical properties of 2-[(9 H -fluoren-2-yl)aryl]-1 H -benz[ d ]imidazole and 2,7-bis[(1 H -benz[ d ]imidazol-2-yl)aryl]- 9 H -fluorene derivatives