BF 2 ‐Complexes of Carbazole–Benzimidazole Conjugates: Synthesis, Structures, and Spectroscopic Properties

A series of carbazole–benzimidazole conjugates and corresponding BF 2 ‐complexes ( BODIPYs ) are synthesized and characterized. Carbazole–benzimidazole conjugates are synthesized by the condensation of 1‐formyl carbazole and phenylene diamines in good yields. Various substituents are introduced into the benzimidazole moiety and subsequent reaction with BF 3 • Et 2 O afforded the BF 2 ‐complexes in moderate to good yield. The structural and photophysical properties of the synthesized fluorophores are investigated with various spectroscopic techniques such as UV /Vis and fluorescence spectroscopy, cyclic voltammetry and X‐ray crystallography.