Metallosupramolecular Poly[2]pseudorotaxane Constructed by Metal Coordination and Crown-Ether-Based Molecular Recognition

A novel bis­(<i>m</i>-phenylene)-32-crown-10 derivative bearing two π-extended pyridyl groups was synthesized, and its host–guest complexation with a paraquat derivative to form a threaded [2]­pseudorotaxane was studied. Subsequently, a poly[2]­pseudorotaxane was constructed with a metallosupramolecular polymer backbone via metal coordination, which was comprehensively confirmed by the combination of ¹H NMR, ³¹P­{¹H} NMR, DOSY NMR, DLS, and EDX techniques

Metallosupramolecular Poly[2]pseudorotaxane Constructed by Metal Coordination and Crown-Ether-Based Molecular Recognition

A novel bis­(<i>m</i>-phenylene)-32-crown-10 derivative bearing two π-extended pyridyl groups was synthesized, and its host–guest complexation with a paraquat derivative to form a threaded [2]­pseudorotaxane was studied. Subsequently, a poly[2]­pseudorotaxane was constructed with a metallosupramolecular polymer backbone via metal coordination, which was comprehensively confirmed by the combination of ¹H NMR, ³¹P­{¹H} NMR, DOSY NMR, DLS, and EDX techniques

A Supramolecular Cross-Linked Conjugated Polymer Network for Multiple Fluorescent Sensing

A supramolecular cross-linked network was fabricated and demonstrated to act as a multiple fluorescent sensor. It was constructed from a fluorescent conjugated polymer and a bisammonium salt cross-linker driven by dibenzo[24]­crown-8/secondary ammonium salt host–guest interactions. Compared with the conjugated polymer, the network has weak fluorescence due to the aggregation of polymer chains. Thanks to the multiple stimuli-responsiveness of host–guest interactions, the fluorescence intensity of the system can be enhanced by four types of signals, including potassium cation, chloride anion, pH increase, and heating. Hence, the network can serve as a cation sensor, an anion sensor, a pH sensor, and a temperature sensor. It can be used in both solution and thin film. Interestingly, exposure of a film made from this supramolecular cross-linked network to ammonia leads to an increase of fluorescence, making it a good candidate for gas detection

Three Protocols for the Formation of a [3]Pseudorotaxane <i>via</i> Orthogonal Cryptand-Based Host–Guest Recognition and Coordination-Driven Self-Assembly

A novel bis(<i>m</i>-phenylene)-32-crown-10-based cryptand <b>1</b> with a pyridine nitrogen atom outside on the third arm was designed and synthesized. Subsequently, host–guest complexation between cryptand <b>1</b> and a selection of bipyridinium guests has been studied. More interestingly, the [3]pseudorotaxane <b>2</b>⊃<b>5</b>₂ was obtained in three methods by utilizing the noninterfering orthogonal nature of coordination-driven self-assembly and host–guest interactions

Three Protocols for the Formation of a [3]Pseudorotaxane <i>via</i> Orthogonal Cryptand-Based Host–Guest Recognition and Coordination-Driven Self-Assembly

A novel bis(<i>m</i>-phenylene)-32-crown-10-based cryptand <b>1</b> with a pyridine nitrogen atom outside on the third arm was designed and synthesized. Subsequently, host–guest complexation between cryptand <b>1</b> and a selection of bipyridinium guests has been studied. More interestingly, the [3]pseudorotaxane <b>2</b>⊃<b>5</b>₂ was obtained in three methods by utilizing the noninterfering orthogonal nature of coordination-driven self-assembly and host–guest interactions

A Water-Soluble Pillar[6]arene: Synthesis, Host–Guest Chemistry, and Its Application in Dispersion of Multiwalled Carbon Nanotubes in Water

The first water-soluble pillar[6]­arene was synthesized. Its water solubility can be reversibly controlled by changing the pH. This solubility control was used in reversible transformations between nanotubes and vesicles and dispersion of multiwalled carbon nanotubes in water

Supramolecular Micelles Constructed by Crown Ether-Based Molecular Recognition

A novel supramolecular amphiphilic polymer constructed by crown ether-based molecular recognition has been fabricated and demonstrated to self-assemble into core–shell supramolecular micelles in water. The reversible transition between assembled and disassembled structures can be achieved by changing the pH. This transition was used to realize the controlled release of small molecules. The supramolecular micelle was characterized by various techniques including conductivity, transmission electron microscopy (TEM), dynamic laser light scattering (DLS), and fluorescence titration. TEM images showed dark gray spherical aggregates, and the mean size of the micelles was 50 nm in diameter and of uniformly dispersed size, in good agreement with the DLS results. The release of hydrophobic molecules from the micelles was realized by adding acid (aqueous HCl), weakening the host–guest interactions and leading to disassembly of the supramolecular micelles

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Hierarchical Self-Assembly: Well-Defined Supramolecular Nanostructures and Metallohydrogels via Amphiphilic Discrete Organoplatinum(II) Metallacycles

Metallacyclic cores provide a scaffold upon which pendant functionalities can be organized to direct the formation of dimensionally controllable nanostructures. Because of the modularity of coordination-driven self-assembly, the properties of a given supramolecular core can be readily tuned, which has a significant effect on the resulting nanostructured material. Herein we report the efficient preparation of two amphiphilic rhomboids that can subsequently order into 0D micelles, 1D nanofibers, or 2D nanoribbons. This structural diversity is enforced by three parameters: the nature of the hydrophilic moieties decorating the parent rhomboids, the concentration of precursors during self-assembly, and the reaction duration. These nanoscopic constructs further interact to generate metallohydrogels at high concentrations, driven by intermolecular hydrophobic and π–π interactions, demonstrating the utility of coordination-driven self-assembly as a first-order structural element for the hierarchical design of functional soft materials