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

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