Supramolecular Side-Chain Poly[2]pseudorotaxanes Formed by Orthogonal Coordination-Driven Self-Assembly and Crown-Ether-Based Host–Guest Interactions

The themes of coordination-driven self-assembly, host–guest interactions, and supramolecular polymerization are unified in an orthogonal noninterfering fashion to deliver side-chain poly[2]­pseudorotaxanes. Specifically, a bis­(<i>p</i>-phenylene)-34-crown-10 derivative <b>1</b> bearing two pyridyl groups polymerizes into a side-chain poly[2]­pseudorotaxane upon the addition of di-Pt­(II) acceptor <b>4</b> in the presence of paraquat. Interestingly, by adding a competitive guest <b>3</b>, the poly[2]­pseudorotaxane can realize a conversion in one pot

Supramolecular Side-Chain Poly[2]pseudorotaxanes Formed by Orthogonal Coordination-Driven Self-Assembly and Crown-Ether-Based Host–Guest Interactions

The themes of coordination-driven self-assembly, host–guest interactions, and supramolecular polymerization are unified in an orthogonal noninterfering fashion to deliver side-chain poly[2]­pseudorotaxanes. Specifically, a bis­(<i>p</i>-phenylene)-34-crown-10 derivative <b>1</b> bearing two pyridyl groups polymerizes into a side-chain poly[2]­pseudorotaxane upon the addition of di-Pt­(II) acceptor <b>4</b> in the presence of paraquat. Interestingly, by adding a competitive guest <b>3</b>, the poly[2]­pseudorotaxane can realize a conversion in one pot

Chemically-Responsive Complexation of A Diquaternary Salt with Bis(<i>m</i>‑phenylene)-32-Crown-10 Derivatives and Host Substituent Effect on Complexation Geometry

A chemically responsive diquaternary salt with π-extended surface was made. The host–guest complexation with chemo-responsiveness between three bis(<i>m</i>-phenylene)-32-crown-10 (BMP32C10) derivatives and this diquaternary salt guest was studied through the sequential addition of basic and acidic reagents (diethylamine and trifluoroacetic acid, respectively). Furthermore, the host-substituent effect on the complexation geometries of these three host–guest complexes, from taco to taco-type threaded to threaded structures by changing the substituent on BMP32C10 as shown by crystal structures, was also addressed

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

Chemically-Responsive Complexation of A Diquaternary Salt with Bis(<i>m</i>‑phenylene)-32-Crown-10 Derivatives and Host Substituent Effect on Complexation Geometry

A chemically responsive diquaternary salt with π-extended surface was made. The host–guest complexation with chemo-responsiveness between three bis(<i>m</i>-phenylene)-32-crown-10 (BMP32C10) derivatives and this diquaternary salt guest was studied through the sequential addition of basic and acidic reagents (diethylamine and trifluoroacetic acid, respectively). Furthermore, the host-substituent effect on the complexation geometries of these three host–guest complexes, from taco to taco-type threaded to threaded structures by changing the substituent on BMP32C10 as shown by crystal structures, was also addressed

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

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

Benzo-21-crown-7-Based [1]Rotaxanes: Syntheses, X‑ray Crystal Structures, and Dynamic Characteristics

Two B21C7-based [1]rotaxanes were synthesized in high yields by means of copper(II)-mediated Eglinton coupling and a subsequent Pd/C-catalyzed reduction under H₂. X-ray single-crystal analysis shows that [1]rotaxane takes on a self-entangled conformation, wherein the macrocycle is threaded by its own tail. Moreover, it was found that [1]rotaxane with a flexible skeleton had more rotational motions than that of one with a rigid skeleton

Achieving <i>In Situ</i> Dynamic Fluorescence in the Solid State through Synergizing Cavities of Macrocycle and Channels of Framework

To achieve in situ dynamic fluorescence in the solid state and unveil the mechanism remain a formidable challenge. Herein, through synergizing the cavities of macrocycles for dynamic complexing and the channels of frameworks for facile transit, we construct intrinsic channels from an emissive cyclophane and realize precisely tunable emission in the solid state through the sequential guests’ exchange. Specifically, two design criteria involve (1) The twisted cyanostilbene units not only endow the systems with solid-state fluorescence but also tailor the π–π interactions in the complex to generate the desired emission and (2) the large cavity of cyclophane results in the formation of ternary complexes with controllable binding affinity which further assemble into robust channels for the guests’ exchange in the bulky state. This strategy unifies the advantages of both macrocycle and framework in one system, achieving visualization, recyclability, and easy processability simultaneously. The present study paves an easy, efficient, and general platform for constructing dynamic optical materials