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聚集诱导发光(AIE)材料吸引了许多光电器件和生物荧光技术领域的科学家的关注.对聚集诱导发光化合物构效关系的深入理解对于设计新材料至关重要.在本工作中,基于经典的AIE基元四苯基乙烯,设计并合成了一系列具有AIE性质,含不同电子给体/受体取代基的炔酮衍生物.对这一系列化合物的光物理性质进行了系统研究并分别探讨了取代基团对发光波长、发光效率和AIE性质的影响.它们的聚集态最大发射波长位于511~565 nm,在四氢呋喃/水混合溶液中的荧光量子产率可达31%.在末端苯环上的电子给体/受体取代基团会降低聚集态的发光效率,而引入硝基取代基则会在发射波长红移的同时,显著猝灭荧光.最为重要的是,这些化合物结构中的炔酮基元可以在一系列金属离子中选择性地与Pd~(2+)配位,猝灭纳米聚集体的发光,并有望作为一个有效的Pd~(2+)荧光传感器.
Aggregated Induction Luminescence (AIE) materials have attracted the attention of many scientists in the field of optoelectronic devices and biofluorescence technologies.An in-depth understanding of the structure-activity relationship of luminescence-induced luminescence compounds is of great importance for the design of new materials.In this work, based on the classical AIE A series of acetylenic ketone derivatives with different AIE properties and different electron donor / acceptor substituents were designed and synthesized.The photophysical properties of these compounds were systematically investigated and discussed separately The results showed that the emission wavelength, luminescent efficiency and AIE properties of the substituted groups were in the range of 511-565 nm, and the fluorescence quantum yield in the mixed solution of tetrahydrofuran / water was up to 31%. Of electron donors / acceptors will reduce luminescent efficiency of the aggregated state, while the introduction of nitro substituents will significantly quench the fluorescence at the red shift of the emission wavelength.Most importantly, the alkynes in the structures of these compounds The ketones can selectively coordinate with Pd 2+ in a series of metal ions to quench the luminescence of the nano-aggregates and is expected to be an effective Pd 2+ fluorescence sensor.