聚集诱导发光型BODIPY类荧光分子的构筑及其性质研究

Organic difluoride boron complexes, with 4,4’-difluoro-4-bora-3a,4a-diaza-s-indacene (BODIPY) as an example, are a family of best-known fluorescent dyes with some excellent properties. Their tunable emission from visible light to near infrared, and high quantum yields allow BODIPYs to be applied in the field of fluorescence sensing and imaging. However, despite their intense fluorescence in solution, BODIPYs show very weak emission in their aggregated states, and this “aggregation-caused emission quenching (ACQ)” has greatly limited the practical applications of BODIPYs in the field of material science. Therefore, great efforts have been paid to the development of BODIPYs with intense fluorescence in the solid state in recent years. To address this need, in this project, we present that design of new “aggregation-induced emission (AIE)” -active BODIPYs with propeller-shaped structure should be a potential strategy for the development of BODIPYs with intense fluorescence in the solid state. By designing of pyridine-, benzoles- and quinoline-based ligand with propeller-shaped structure, a series of novel BODIPYs with AIE and intense fluorescence in the solid state will be synthesized. The relationship between the structures and the optical properties of these new BODIPYs will be studied. The potential application of these new BODIPYs in the field of acid/base sensor, piezochromic materials and OLED will also be studied. This research will result in the discovery of new design strategies for solid-state emissive BODIPYs and promote the applications of BODIPYs in the field of materials science.

以硼氟吡咯(BODIPY)为代表的有机硼氟配合物由于具有发射波长可调和量子产率高等优点, 已被广泛应用于荧光检测与成像等领域。虽然BODIPY类荧光分子在溶液中发光性质优异，但其在聚集状态下荧光严重猝灭，制约了该类分子在固态发光材料领域的应用。因此，设计合成在固态具有高效发光效率的BODIPY类荧光分子是一项非常迫切而且具有挑战性的课题。本项目将针对BODIPY类荧光分子固态荧光猝灭严重的缺点，拟采用聚集诱导发光策略，通过在吡啶、苯并唑类及喹啉等化合物构建的不对称双齿配体上引入可自由旋转的取代基，设计合成一系列具有螺旋桨型结构的高效固态发光的BODIPY类荧光分子，系统研究它们的构效关系，为固态发光的BODIPY类荧光分子的设计合成提供有效的理论支持；筛选出性能优异的荧光分子，研究它们在固态荧光传感、压致荧光材料以及有机发光二极管等领域的应用潜力，促进BODIPY在固态发光材料领域的应用。

以硼氟吡咯(BODIPY)为代表的硼氟类荧光配合物由于具有发射波长可调和量子产率高等优点, 已被广泛应用于荧光检测与成像等领域。虽然硼氟类荧光配合物在溶液中发光性质优异，但其在聚集状态下荧光严重猝灭，从而制约了硼氟类荧光配合物在固态发光材料领域的应用。因此，设计合成在固态具有高效发光效率的硼氟类荧光配合物是一项非常迫切而且具有挑战性的课题。本项目针对硼氟类荧光配合物固态荧光猝灭严重的缺点，采用了聚集诱导发光策略，通过在吡啶、嘧啶及联萘酚类不对称双齿配体上引入可自由旋转的取代基，设计合成了一系列具有螺旋桨型结构的高效固态发光的硼氟类荧光配合物，所获得的这些配合物固态发光效率在0.10-0.50之间，斯托克斯位移在700-8400cm-1之间。所筛选出的配合物还表现出了性能优异的酸碱气体响应、压力刺激响应以及聚集态圆偏振发光行为等，具有在刺激响应型材料以及圆偏振发光材料领域应用的潜力。本项目研究获得了数种具有高效聚集态发光的硼氟类荧光配合物，证明了聚集诱导发光策略在构建聚集态发光型硼氟类荧光配合物方面的应用潜力，促进了硼氟类荧光配合物在聚集态发光材料领域的应用。