Pillar[5]arene tetramers with tetraphenylethene cores and different lengths of alkyl ether chains (H1-4C4P and H2-2C4P) and a 9,10-distyrylanthrace-bridged neutral guest linker (DSA-G) are synthesized to fabricate tunable solid-state fluorescent materials through supramolecular assemblies of DSA-G⊂H1-4C4P and DSA-G⊂H2-2C4P. Their fluorescence emission is strongly enhanced and their colors are changed upon assembly, which can be ascribed to the supramolecular assembly-induced enhanced emission and Förster resonance energy transfer (FRET) processes between H1-4C4P (or H2-2C4P) and DSA-G. Both ensembles of DSA-G⊂H1-4C4P and DSA-G⊂H2-2C4P exhibit thermo and solvent dual-responsive features, while DSA-G⊂H2-2C4P shows higher sensitivity toward external stimuli as compared to DSA G⊂H1-4C4P due to the shorter distance between fluorophores. The use of these fluorescent materials as inks confirms their efficiencies in the solid-state, paving the way for new potential applications of smart optical materials based on supramolecular assemblies.

中文翻译：

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通过超分子组装诱导的Förster共振能量转移增强的基于[5]芳烃的可调谐发光材料

合成具有四苯基乙烯核和不同长度的烷基醚链（H1-4C4P和H2-2C4P）和9,10-二氰基蒽桥接的中性客体连接体（DSA-G）的支柱[5]芳烃四聚体，以制备可调谐的固态通过DSA-G⊂H1-4C4P和DSA-G⊂H2-2C4P的超分子组装产生荧光材料。它们的荧光发射大大增强，并且它们的颜色在组装时改变，这可以归因于超分子组装诱导的发射和H1-4C4P（或H2-2C4P）与DSA-G之间的福斯特共振能量转移（FRET）过程。DSA-G⊂H1-4C4P的两个合奏DSA-G⊂H2-2C4P和DSA-G⊂H2-2C4P表现出热和溶剂双重反应特性，而DSA-G⊂H2-2C4P与DSAG⊂H1-4C4P相比，由于荧光团之间的距离较短，因此对外部刺激的敏感性更高。这些荧光材料作为墨水的使用证实了它们在固态时的效率，为基于超分子组件的智能光学材料的新的潜在应用铺平了道路。