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A modular approach to polycyclic N-fused heteroaromatics is described. Acid-catalyzed reactions of various 1-(2-oxo-2-arylethyl)-1 H -pyrrole-2-carbaldehydes with several o -phenylenediamines provided facile access to a number of new benzo[ d ]imidazole-pyrrolo[1,2- a ]pyrazine hybrid structures through double cyclodehydration and aromatization. Optical characterization of the synthesized compounds revealed unique emission properties, with deep blue emission in the aggregated and solid states, and a dramatic substituent effect was observed. Fusion of an additional benzene ring into the benzo[4,5]imidazo[1,2- a ]pyrrolo[2,1- c ]pyrazine scaffold resulted in a remarkable increase in the intensity of blue fluorescence from the solution along with good cell permeability and negligible phototoxicity, indicating the potential for bioimaging applications.

rsc advances

Facile approach to benzo[<i>d</i>]imidazole-pyrrolo[1,2-<i>a</i>]pyrazine hybrid structures through double cyclodehydration and aromatization and their unique optical properties with blue emission

Facile approach to benzo[d]imidazole-pyrrolo[1,2-a]pyrazine hybrid structures through double cyclodehydration and aromatization and their unique optical properties with blue emission