Fused dual boron core based BODIPY dyes: synthesis and optical character.

Here we report that two boron dipyrromethene derivatives ( BNB-1 and BNB-2 ), bearing double boron atomic centers, have been synthesized and characterized. The additional boron atom was introduced into the skeleton of typical BODIPY dyes through the reaction of BF 3 ·Et 2 O and the two ligands, phenol and Schiff’s base. The maximum emission wavelength of both dyes moved to 584–603 nm with the larger Stokes’ shift (Δ λ ≈ 40 nm). Moreover, less solvent polarity dependence of the Stokes’ shift (40 ± 6 nm) was found in different organic solvents. Furthermore, fluorescent lifetime and CV methods were also performed to explore the photophysical and electrochemical behaviors of both dyes. [ABSTRACT FROM AUTHOR]