By changing benzo-fused position on pyridyl unit, three aza boron-pyridyl-isoindoline isomers, a new type of BODIPY analog, are synthesized through a facile two step reaction. These isomers show broad envelopes of intense vibrational bands in the absorption and emission spectra with moderate fuorescence quantum yields. In comparison to those of classical BODIPYs, signifcant fuorescence intensity are observed for these isomers in flm and powder. An analysis of the structureproperty relationships has been carried out based on X-ray crystallography, optical spectroscopy, and theoretical calculation.
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