Configurationally Confined Multilevel Supramolecular Assemblies for Modulating Multicolor Luminescence

Abstract

Herein, multilevel supramolecular assemblies are reported based on sulfobutylether‐β‐cyclodextrin (SBE‐βCD) and cucurbit[8]uril (CB[8]), which can control the topological morphology from nanoparticles to nanosheets and modulate the multicolor luminescence. Benefiting from the large cavity of CB[8] and its strong binding affinity with positively charged tetraphenylethylene pyridinium (TPE‐Py), a 1:2 stoichiometric supramolecular assembly is formed through host–guest interactions with binding constants of 2.95 × 1011 M−2 and fluorescence bathochromic shift about 35 nm due to the macrocyclic confinement effect, thereby endowing the fluorescence enhancement about 20 times when further assembled with negatively charged SBE‐βCD to form nanosheets through electrostatic interactions. In contrast, the direct assembly of TPE‐Py and SBE‐βCD can form nanoparticles through electrostatic interactions, showing only tenfold enhancement and no bathochromic shift due to the lack of macrocyclic confinement effect. After doping the near‐infrared dye acceptor sulfonated aluminum phthalocyanine (AlPcS4), the nanosheets structure exhibits a higher energy transfer efficiency of about 75% and a larger antenna effect of 29.3 than that of nanoparticles. The multilevel supramolecular assemblies can be used in multicolor luminescence information storage and multiple logical gate systems, providing an efficient approach for configurationally confined topological morphology regulation and luminescent materials.

Aromatic Bridged Bis(triphenylamine) Cascade Assembly Achieved Tunable Nanosupramolecular Morphology and NIR Targeted Cell Imaging

“…We also reported the configurationally confined cascade nanosupramolecular assembly, which was constructed by CB [8], cationic tetraphenylpyridium derivative, and negatively charged β-cyclodextrin, modulating the topological morphology change from nanoparticles to nanosheets and realized the multicolor fluorescence by the energy transfer process. 22 However, adopting CB[n] and CDs, two kinds of hydrophobic macrocycle cascade confinement, to enhance the PRET and NIR luminescence with a large Stokes shift has not been reported, to the best of our knowledge.…”

Cucurbituril-based supramolecular host–guest complexes: single-crystal structures and dual-state fluorescence enhancement

“…19–22 By carefully designing the host–guest system and manipulating their interactions, tunable emission wavelengths, fluorescence intensities, quantum yields, and other light-related behaviors can be achieved, thus paving the way for advanced applications in optoelectronics, sensors, imaging, and photonics. 23–27 Understanding these interactions helps in designing and engineering more efficient host molecules and optimizing guest binding for various applications. 24,28–31…”

“…23–27 Understanding these interactions helps in designing and engineering more efficient host molecules and optimizing guest binding for various applications. 24,28–31…”

A supramolecular assembly strategy towards organic luminescent materials

“…Therefore, it has a wide range of applications in catalysis, 1,2 artificial photosynthesis, 3,4 drug delivery, 5,6 detection 7,8 and other fields. In particular, when applied to the field of luminescence, different photophysical processes such as fluorescence, 9 room-temperature phosphorescence (RTP), 10,11 energy transfer 12 and electron transfer 13 processes can be regulated by supramolecular strategies, so that different luminescence and stimulus response (pH, 14 light, 15 temperature, 16 pressure, 17 etc. ) properties can be assigned to conventional dye units, which further portends the fabrication of new sensors.…”