Difluoroboron β-diketonate complexes () are classic fluorescent molecules that have been applied in luminescent materials, oxygen and mechanical sensors, and most investigations concentrate on with varying aromatic groups without heteroatoms. In this work, a new molecular platform with heterocycle-substituted is prepared in one pot, and six unsymmetric π-expanded are synthesized via condensation reaction. exhibit comparable fluorescence properties in solution, aggregated and solid states. (683 nm, = 13.1 %) and (700 nm, = 2.1 %) show near infra-red (NIR) emission with moderate fluorescence intensity in solution state. Solid emission of , and are detected with fluorescence quantum yield from 12.8 % to 25.6 %, and , and show AIE phenomenon in aggregated state. The results are supported by crystal analysis and DFT calculation in some extent. In a word, this work enriches the heterocycle-substituted system. and with moderate intensity NIR emission in solution, aggregated and solid states at the same time, providing a simple preparation method for multi-states luminescent dyes.

中文翻译：

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吡咯取代的二氟硼β-二酮染料：易于合成和多态光学性质


二氟硼β-二酮配合物（）是经典的荧光分子，已应用于发光材料、氧和机械传感器，大多数研究集中在不含杂原子的不同芳香族基团上。本工作一锅法制备了杂环取代的新分子平台，并通过缩合反应合成了六个不对称π-展开结构。在溶液、聚集和固态下表现出可比的荧光特性。 （683 nm，= 13.1％）和（700 nm，= 2.1％）在溶液状态下显示出具有中等荧光强度的近红外（NIR）发射。和 的固体发射被检测到，荧光量子产率为 12.8% 至 25.6%，并且 、 和 在聚集状态下表现出 AIE 现象。该结果在一定程度上得到了晶体分析和DFT计算的支持。总之，这项工作丰富了杂环取代体系。同时在溶液、聚集态和固态中具有中等强度的近红外发射，为多态发光染料提供了一种简单的制备方法。