Photoresponsive metallo-hydrogels based on visual discrimination of the positional isomers through selective thixotropic gel collapse

Fang, Weiwei; Liu, Xiyu; Lu, Zhengwei; Tu, Tao

doi:10.1039/c3cc49402k

Cited by 58 publications

(39 citation statements)

References 35 publications

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“…Furthermore, they also developed a photoswitchable metallohydrogel by utilizing the photoresponsive 2,2′-azopyridine as the ligand. 472 In addition, Bhattacharya et al also prepared a thixotropic hydrogel based on the interaction of pyridylenevinylene and copper(II). 473 …”

Section: Molecular Designmentioning

confidence: 99%

Supramolecular Hydrogelators and Hydrogels: From Soft Matter to Molecular Biomaterials

et al. 2015

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In this review we intend to provide a relatively comprehensive summary of the work of supramolecular hydrogelators after 2004 and to put emphasis particularly on the applications of supramolecular hydrogels/hydrogelators as molecular biomaterials. After a brief introduction of methods for generating supramolecular hydrogels, we discuss supramolecular hydrogelators on the basis of their categories, such as small organic molecules, coordination complexes, peptides, nucleobases, and saccharides. Following molecular design, we focus on various potential applications of supramolecular hydrogels as molecular biomaterials, classified by their applications in cell cultures, tissue engineering, cell behavior, imaging, and unique applications of hydrogelators. Particularly, we discuss the applications of supramolecular hydrogelators after they form supramolecular assemblies but prior to reaching the critical gelation concentration because this subject is less explored but may hold equally great promise for helping address fundamental questions about the mechanisms or the consequences of the self-assembly of molecules, including low molecular weight ones. Finally, we provide a perspective on supramolecular hydrogelators. We hope that this review will serve as an updated introduction and reference for researchers who are interested in exploring supramolecular hydrogelators as molecular biomaterials for addressing the societal needs at various frontiers.

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Section: Molecular Designmentioning

confidence: 99%

Supramolecular Hydrogelators and Hydrogels: From Soft Matter to Molecular Biomaterials

et al. 2015

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“…19 Because the metal ions can be in different oxidation states, metallogels exhibit a unique redox responsiveness, showing potential applications in electrochemical measurements 20. 21 The involvement of metal ions imparts the metallic functional properties of the gel materials, bringing more possibility in applicative aspects of catalysis,22, 23 light‐emitting,14, 24 visual recognition,25–27 chemical analysis,28 dye adsorption,29 conductive materials,30 and so on.…”

Section: Introductionmentioning

confidence: 99%

Hydrogels Triggered by Metal Ions as Precursors of Network CuS for DNA Detection

Wang

Song

Hao

et al. 2015

Chemistry A European J

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The gelation behavior of lithocholate (LC(-) ) with different metal ions in water was investigated. The microstructures of hydrogels were determined to be three-dimensional (3D) networks of fibrous aggregates. The formation of fibrils was speculated to be mainly driven by the coordination between carboxylate of LC(-) and metal ions, accompanied by the assistance of noncovalent interactions such as electrostatic and hydrophobic interactions. The hydrogels, which can maintain the mechanical strength at higher temperature, exhibit thermal stability. Their gelation capability was enhanced with the increase in acidity. The hydrogels of LC(-) and Cu(2+) mixtures served as the precursors for producing network nanostructures of CuS nanoparticles. These new CuS networks exhibit high fluorescence quenching ability and can act as an effective fluorescent sensing platform for ssDNA detection.

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“…However,o ther common aromatic organic compounds, such as pyrene, anthracene, 1-naphthol, tetraphenylethylene, and carbazole, could not induce such collapse of the gel even,ifo ver 10.0 equivalents of organic guests were added. Notably,a lthough al arge number of stimuli-responsives upramolecular gels have been reported, examples of aromatic guest stimuli-responsiveg els, which have potential applicationsi nv isual discrimination, [16] have been relatively unexplored.…”

Section: Resultsmentioning

confidence: 99%

Construction of Alkynylplatinum(II) Bzimpy‐Functionalized Metallacycles and Their Hierarchical Self‐Assembly Behavior in Solution Promoted by Pt⋅⋅⋅Pt and π–π Interactions

Jiang

Zhang

Zheng

et al. 2016

Chemistry A European J

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A family of new alkynylplatinum(II) 2,6-bis(benzimidazol-2'-yl)pyridine (bzimpy)-functionalized supramolecular metallacycles with different shapes and sizes have been successfully prepared by coordination-driven self-assembly. The obtained metallacycles showed switchable emission and a strong tendency to form intermolecular Pt⋅⋅⋅Pt and π-π stacking interactions in solution that were not displayed by their individual precursors. Further investigation revealed that the existence of the metallacyclic scaffold at the core could facilitate the formation of intermolecular Pt⋅⋅⋅Pt and π-π stacking interactions of peripheral alkynylplatinum(II) bzimpy units. Moreover, the shapes and sizes of the metallacyclic scaffold have a significant influence on the hierarchical self-assembly behavior. Among the three metallacycles, hexagonal metallacycle A, with a relatively small size, could spontaneously self-assemble into an aromatic guest stimuli-responsive metallogel at room temperature without a heating-cooling process.

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Photoresponsive metallo-hydrogels based on visual discrimination of the positional isomers through selective thixotropic gel collapse

Abstract: Incorporating the visual discrimination of 2,2'-bipyridine and self-healing properties, a novel photo-switchable metallo-hydrogel system is fabricated using a pincer-type Cu(II) complex and 2,2'-azopyridine.

Cited by 58 publications

References 35 publications

Supramolecular Hydrogelators and Hydrogels: From Soft Matter to Molecular Biomaterials

Supramolecular Hydrogelators and Hydrogels: From Soft Matter to Molecular Biomaterials

Hydrogels Triggered by Metal Ions as Precursors of Network CuS for DNA Detection

Construction of Alkynylplatinum(II) Bzimpy‐Functionalized Metallacycles and Their Hierarchical Self‐Assembly Behavior in Solution Promoted by Pt⋅⋅⋅Pt and π–π Interactions

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