Five-membered-ring fused BODIPYs and aza-BODIPY were herein prepared. X-ray crystallographic analysis revealed that the core skeleton of six-membered-ring fused BODIPY is nonplanar but twisted. Such five-membered-ring fused BODIPY/aza-BODIPY dyes have long wavelength absorptions/emissions, high extinction coefficients, peak fluorescence and narrow excitations/emissions. MO calculations well supported and explained the same absorption maxima between BODIPY bearing the five-membered ring and BODIPY bearing the six-membered ring.

中文翻译：

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带有五元环的长波吸收BODIPY / aza-BODIPY的合成及其光物理性质

本文制备了五元环稠合的BODIPY和氮杂-BODIPY。X射线晶体学分析表明，六元环稠合的BODIPY的核心骨架是非平面而是扭曲的。这种五元环稠合的BODIPY /氮杂-BODIPY染料具有长的波长吸收/发射，高消光系数，峰值荧光和窄的激发/发射。MO计算很好地支持并解释了带有五元环的BODIPY和带有六元环的BODIPY之间的相同吸收最大值。