Configurationally Confined Multilevel Supramolecular Assemblies for Modulating Multicolor Luminescence

摘要

Herein, multilevel supramolecular assemblies are reported based onsulfobutylether-β-cyclodextrin (SBE-βCD) and cucurbit8uril (CB8), whichcan control the topological morphology from nanoparticles to nanosheetsand modulate the multicolor luminescence. Benefiting from the largecavity of CB8 and its strong binding affinity with positively charged tetraphenylethylenepyridinium (TPE-Py), a 1:2 stoichiometric supramolecularassembly is formed through host–guest interactions with binding constantsof 2.95 × 10~(11) M~(?2) and fluorescence bathochromic shift about 35 nm dueto the macrocyclic confinement effect, thereby endowing the fluorescenceenhancement about 20 times when further assembled with negativelycharged SBE-βCD to form nanosheets through electrostatic interactions. Incontrast, the direct assembly of TPE-Py and SBE-βCD can form nanoparticlesthrough electrostatic interactions, showing only tenfold enhancement and nobathochromic shift due to the lack of macrocyclic confinement effect. Afterdoping the near-infrared dye acceptor sulfonated aluminum phthalocyanine(AlPcS4), the nanosheets structure exhibits a higher energy transfer efficiencyof about 75 and a larger antenna effect of 29.3 than that of nanoparticles.The multilevel supramolecular assemblies can be used in multicolor luminescenceinformation storage and multiple logical gate systems, providingan efficient approach for configurationally confined topological morphologyregulation and luminescent materials.