Recent Advances in Supramolecular Gels and Catalysis

Fang, Weiwei; Zhang, Yang; Wu, Jing; Liu, Cong; Zhu, Haibo; Tu, Tao

doi:10.1002/asia.201800017

Cited by 125 publications

(87 citation statements)

References 149 publications

(228 reference statements)

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“…Gels have great potential in catalysis as a result of their solvated nature and the ability of small-molecule reagents to diffuse through them-indeed, gels can be considered intermediate between homogeneous and heterogeneous catalytic systems, combining the advantages of both. [24] We recently reported that DBS-CONHNH 2 hydrogels achieve efficient in-situ reduction of precious metals to yield gels with embedded metal nanoparticles (NPs). [20c] Furthermore, gels with embedded palladium nanoparticles (PdNPs) can catalyse Suzuki-Miyaura cross-coupling reactions.…”

Section: Resultsmentioning

confidence: 99%

Self‐Assembling Supramolecular Hybrid Hydrogel Beads

2019

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With the goal of imposing shape and structure on supramolecular gels, we combine a low‐molecular‐weight gelator (LMWG) with the polymer gelator (PG) calcium alginate in a hybrid hydrogel. By imposing thermal and temporal control of the orthogonal gelation methods, the system either forms an extended interpenetrating network or core–shell‐structured gel beads—a rare example of a supramolecular gel formulated inside discrete gel spheres. The self‐assembled LMWG retains its unique properties within the beads, such as remediating PdII and reducing it in situ to yield catalytically active Pd0 nanoparticles. A single PdNP‐loaded gel bead can catalyse the Suzuki–Miyaura reaction, constituting a simple and easy‐to‐use reaction‐dosing form. These uniquely shaped and structured LMWG‐filled gel beads are a versatile platform technology with great potential in a range of applications.

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Section: Resultsmentioning

confidence: 99%

Self‐Assembling Supramolecular Hybrid Hydrogel Beads

2019

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“…For the sake of clarity, only some selected typical examples are reported in this section to highlight the various possibilities to obtain catalytic transformations using supramolecular gels. For complementary information on this topic, we advise the reader to refer to the very recent review of Tu and coworkers [191].…”

Section: Supramolecular Physical Gelsmentioning

confidence: 99%

Supramolecular Chemistry and Self-Organization: A Veritable Playground for Catalysis

2019

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The directed assembly of molecular building blocks into discrete supermolecules or extended supramolecular networks through noncovalent intermolecular interactions is an ongoing challenge in chemistry. This challenge may be overcome by establishing a hierarchy of intermolecular interactions that, in turn, may facilitate the edification of supramolecular assemblies. As noncovalent interactions can be used to accelerate the reaction rates and/or to increase their selectivity, the development of efficient and practical catalytic systems, using supramolecular chemistry, has been achieved during the last few decades. However, between discrete and extended supramolecular assemblies, the newly developed “colloidal tectonics” concept allows us to link the molecular and macroscopic scales through the structured engineering of colloidal structures that can be applied to the design of predictable, versatile, and switchable catalytic systems. The main cutting-edge strategies involving supramolecular chemistry and self-organization in catalysis will be discussed and compared in this review.

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“…Due to the application prospects in various fields, such as chemical sensors, biocompatible materials, catalysis, drug delivery, electronics, flexible optics, templates for molecule synthesis, information storage, stimuli‐responsive materials, etc., supramolecular gel has gained more and more research interest acting as an intelligent “soft material.” 1‐4 Usually the non‐covalent interactions, including hydrogen bond, hydrophilicity/hydrophobicity, π‐π stacking, electrostatic interaction, Van der Waals force, metal‐coordination and so on, among small molecule building blocks play an essential role in the fabrication process of supramolecular gels 5,6 . The delicate cooperativity of these non‐covalent interactions as well as the contribution from solvents would generate different nanostructures with diverse morphologies and sizes, making the supramolecular gel an ideal platform for nanostructure construction and function extension.…”

Section: Introductionmentioning

confidence: 99%

Polydiacetylene (PDA) based supramolecular gel upon coassembly with a bolaamphiphilic cogelator

Liu

Ding

et al. 2020

Polymers for Advanced Techs

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Supramolecular gel systems provide an ideal platform for the study of conjugated polydiacetylene (PDA) in soft materials. Compared with the well studied amphiphiles, the bolaamphiphilic molecules received much less attention in the fabrication of supramolecular gels. It's a big challenge to develop bolaamphiphilic type cogelators with reasonable molecular structures for the preparation of PDA supramolecular gels. Herein, a novel bolaamphiphilic cogelator containing an imidazole group at both ends was designed and coassembled with commercially available diacetylene acid monomer at 1:2 molar ratio by multiple non‐covalent interactions. A white supramolecular gel was successfully prepared through the conventional heating‐cooling method and systematically characterized by 1H‐NMR, FT‐IR, XRD, SEM and rheology test. After UV irradiation, blue PDA was polymerized in the supramolecular gel system, as verified by UV‐Vis absorption and Raman spectroscopy. When heated to 55°C and 75°C, a successive blue‐to‐purple‐to‐red colorimetric transition was observed for the PDA supramolecular gel. Interestingly, after cooled to room temperature, the purple PDA could return to the original blue phase reversibly, while the red PDA remained in the red phase with an obvious fluorescence enhancement effect. This work would promote the investigation of bolaamphiphilic molecules as well as conjugated PDA in soft materials.

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Recent Advances in Supramolecular Gels and Catalysis

Cited by 125 publications

References 149 publications

Self‐Assembling Supramolecular Hybrid Hydrogel Beads

Self‐Assembling Supramolecular Hybrid Hydrogel Beads

Supramolecular Chemistry and Self-Organization: A Veritable Playground for Catalysis

Polydiacetylene (PDA) based supramolecular gel upon coassembly with a bolaamphiphilic cogelator

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