The construction of a two-dimensional supramolecular organic framework with parallelogram pores and stepwise fluorescence enhancement

Xu, Shunqi; Zhang, Xiang; Nie, Cheng Bin; Pang, Zhong-Fu; Xu, Xiaona; Zhao, Xin

doi:10.1039/c5cc05875a

Cited by 114 publications

(70 citation statements)

References 38 publications

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“…It has been already reported that TPE-4Q and CB [8] can form a supramolecular organic framework monolayer in 1:2 molecular ratio during the preparation of our manuscript (15). More interestingly, it is found that in our case, a hydrogel could be further formed by the same host and guest components.…”

Section: Formation Of the Supramolecular Hydrogelsupporting

confidence: 49%

“…SEM properties and functions. For instance, Zhao et al (15) reported a highly ordered porous SOF monolayer, by which the fluorescence emission of nonemissive components could be greatly enhanced upon rigid organisation with cucurbituril in water-organic mixed solvent. Supramolecular hydrogels are one of water-based soft materials that have highly variable mechanical properties, which make them increasingly important in biomedical and industrial applications (16)(17)(18)(19)(20).…”

Section: Introductionmentioning

confidence: 98%

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Adsorption of anionic dyes from water by thermostable supramolecular hydrogel

Chen

Zhang

Liu

2016

Supramolecular Chemistry

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A supramolecular hydrogel was successfully constructed by the noncovalent association of cucurbit [8]uril (CB[8]) with a tetraphenylethylene (TPE) derivative bearing four monocharged viologens (TPE-4Q). Due to the attractive photophysical behaviours of TPE and its rigid complexation with CB[8], the obtained hydrogel emits bright orange fluorescence and is highly thermostable even at 200 °C. Rheological analyses and microscopic investigations jointly confirm that the supramolecular hydrogel possesses good rheological properties and well-organised lamellar structures. Significantly, the assembly/disassembly process of this supramolecular hydrogel can be efficiently modulated by several external stimuli, including pH, mechanical force and competitive guests. Moreover, as investigated by UV/Vis and fluorescence titrations, this two-dimensional selfassembly can specifically adsorb π-conjugated anionic dyes in water with high adsorption efficiency, mainly through the π-stacking interaction with TPE backbones and the electrostatic interaction with monocharged viologen sites.

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Section: Formation Of the Supramolecular Hydrogelsupporting

confidence: 49%

Section: Introductionmentioning

confidence: 98%

Adsorption of anionic dyes from water by thermostable supramolecular hydrogel

Chen

Zhang

Liu

2016

Supramolecular Chemistry

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“…The 1 H‐NMR spectrum of PMI1 (0.1 mM) in D 2 O shows three sets of aromatic peaks at 6.5‐8.0 ppm. These peaks gradually disappeared as the CB8 concentration increased and the complete disappearance was affected in the presence of 1 equivalent of CB8, suggesting the possible formation of large self‐assembled structures of CB8• PMI1 complex in D 2 O …”

Section: Resultsmentioning

confidence: 99%

Structural Effects on Guest Binding in Cucurbit[8]uril‐Perylenemonoimide Host‐Guest Complexes

et al. 2018

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A series of water‐soluble fluorescent perylene dyes (perylenemonoimides PMI1, PMI2, and PMI3) with two aromatic binding units (a perylene‐core and a phenyl group) as guest molecules for binding with cucurbit[8]uril (CB8) were synthesized. The guest structure was varied by modifying the phenyl group and the spacer between the two binding units. Differences in binding, self‐assembly, and optical properties of the corresponding host‐guest complexes were observed. At low micromolar concentrations, a highly emissive 1:1 CB8•PMI1 complex with high binding affinity (Ka=1.5 x 107 M–1) was formed in water. Interestingly, at higher concentrations of the CB8•PMI1 complex (e. g., >10–4 M), non‐emissive self‐assembled nanowires were formed. In comparison, the binding affinity of CB8•PMI2 and CB8•PMI3 was determined to be only 5.0 x 105 M–1 and 1.7 x 104 M–1, respectively. The host‐guest complexes with various binding affinities could serve as fluorescent displacement probes for the detection of a range of CB8‐binding guest analytes.

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“…However, precise synthesis of highly ordered organic 2D structure is a still challenging task due to synthetic difficulties in forming covalent bonded 2D crystals. Therefore, the reversible supramolecular noncovalent interactions as an alternative or dynamic convent bonding have been utilized to address this concern; despite a few successes, either method tend to afford low stability and lack of fully π conjugation in the synthesized 2D films . Many efforts have been made in exploring new organic reactions and preparation methods to overcome these disadvantages.…”

mentioning

confidence: 99%

Interfacial Synthesis of Conjugated Crystalline 2D Fluorescent Polymer Film Containing Aggregation‐Induced Emission Unit

Liu

Zhang

et al. 2019

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A fully conjugated 2D fluorescent film containing a tetraphenylethene (TPE) unit is constructed by Glaser–Hay coupling reaction on the surface of copper foil. A large‐area, freestanding fluorescent films with an average thickness 4.5 nm can be obtained through the strategy of solid–liquid interfacial synthesis. The film and the pore structure are characterized by transmission electron microscopy (TEM), scanning electron microscopy (SEM), atomic force microscopy (AFM), X‐ray photoelectron spectroscopy (XPS). High‐resulution TEM and selected area electron diffraction (SAED) further confirm the dual pores structure with triangular‐ and hexagonal‐shaped pores. The as‐prepared 2D films exhibit excellent solid‐state fluorescence emission arising from the confinement of TPE units.

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The construction of a two-dimensional supramolecular organic framework with parallelogram pores and stepwise fluorescence enhancement

Cited by 114 publications

References 38 publications

Adsorption of anionic dyes from water by thermostable supramolecular hydrogel

Adsorption of anionic dyes from water by thermostable supramolecular hydrogel

Structural Effects on Guest Binding in Cucurbit[8]uril‐Perylenemonoimide Host‐Guest Complexes

Interfacial Synthesis of Conjugated Crystalline 2D Fluorescent Polymer Film Containing Aggregation‐Induced Emission Unit

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