A novel supramolecular Föster resonance energy transfer (FRET) system was fabricated by utilizing rhodamine B (RB) functionalized pillar[5]arene (EtP5-RB) and cyano-modified boron dipyrromethene (BDP-CN) based on their host–guest recognition at 5.0 × 10^–5 M, which could be turned “on” and “off” by adding trifluoroacetic acid (TFA) and triethylamine (TEA), respectively. At a higher concentration (1.0 × 10^–4 M) in acetone, EtP5-RB self-assembled into vesicles while EtP5-RBH self-assembled into nanoribbons. After the addition of BDP-CN, both EtP5-RB⊃BDP-CN and EtP5-RBH⊃BDP-CN self-assembled into nanoparticles, which caused the fluorescence of the host–guest complexes to be quenched.

中文翻译：

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罗丹明B功能化支柱[5]芳烃基的主客体识别图案制造的酸/碱可控FRET和自组装系统。

基于罗丹明B（RB）官能化的柱[5]芳烃（EtP5-RB）和氰基改性的硼二吡咯二烯（BDP-CN），基于其在主客体上的识别，制造了一种新型的超分子福斯特共振能量转移（FRET）系统。 5.0×10 ^–5 M，可以通过分别添加三氟乙酸（TFA）和三乙胺（TEA）来“打开”和“关闭”。在丙酮中浓度较高（1.0×10 ^–4 M）时，EtP5-RB自组装为囊泡，而EtP5-RBH自组装为纳米带。加入后，BDP-CN，既EtP5-RB ⊃ BDP-CN和EtP5-RBH⊃BDP -CN自组装成纳米颗粒，这导致主体-客体复合物的荧光被淬灭。