Electrostatic co-assembly of pillar[n]pyridiniums and calix[4]arene in aqueous media

Abstract

The cationic pillar[n]pyridiniums and anionic p-sulfonatocalix[4]arene co-assemble into all-organic supersalts through encaging of the supercation units within/between the capsules emerged from superanion pairs. The encapsulation occures both in the solid...

Pillar[n]arene–calix[m]arene hybrid macrocyclic structures

“…, the heteroatom-containing macrocycles acting as the guest molecule to be included by the other cavity via supramolecular interactions, such as electrostatic forces. For example, 92 cationic pillar[ n ]pyridiniums, such as the rigid square-shaped tetramer P8 and the flexible roughly hexagonal hexamer P9 ( Scheme 7 ), were encapsulated by anionic p -sulfonatocalix[4]arene C3 ( Scheme 7 ) in the solid state and aqueous solution phase by electrostatic attractions, and anion⋯π + , anion⋯π + ⋯anion and π⋯π + interactions, leading to the co-assemblies of oppositely charged hybrid macrocycles ( Fig. 4 and 5 ).…”

“…Fig. 4 Expanded asymmetric unit of 1/2 P8$C3 (A), where H 2 O was trapped inside the center of P8 (B) by a series of weak supramolecular interactions (C-E) 92. Copyright© 2022 by The Royal Society of Chemistry.…”