Abstract：
Responsive organic luminescent aggregates have a wide range of application fields, but currently there is still a lack of reasonable molecular design strategies. Introducing ion-π interactions into molecules can effectively alter their luminescent properties. However, current research typically focuses on ion localization at luminescent conjugated groups with the strong interaction forces. In this work, we introduce the flexible alkoxy chain spacers between fluorescent conjugated groups and ion-π interaction sites, and then adjust the fluorescence performance of the molecule by changing the strength of ion-π interactions. Bromine ion-based molecules with strong ion-π interactions exhibit high and stable fluorescence quantum yields in crystals and amorphous powders under the external stimuli. Hexafluorophosphate ion-based molecules with weak ion-π interactions have the high fluorescence quantum yield in crystals and very low fluorescence quantum yield in amorphous powders, showing variable fluorescence intensities under external stimuli. This demonstrates a new class of responsive organic luminescent solid-state materials.
摘要：
响应式有机发光聚集体具有广泛的应用领域,但目前仍缺乏合理的分子设计策略。将离子-π相互作用引入分子中可以有效地改变其发光性质。然而,当前的研究通常集中在具有强相互作用力的发光共轭基团上的离子定位。在这项工作中,我们在荧光共轭基团和离子-π相互作用位点之间引入了柔性烷氧基链间隔区，然后通过改变离子-π相互作用的强度来调节分子的荧光性能。具有强离子-π相互作用的基于溴离子的分子在外部刺激下在晶体和无定形粉末中表现出高且稳定的荧光量子产率。具有弱离子-π相互作用的六氟磷酸盐离子基分子在晶体中具有高的荧光量子产率，在无定形粉末中具有非常低的荧光量子产率，在外部刺激下显示可变的荧光强度。这证明了一类新的响应性有机发光固态材料。
