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Caged supramolecular systems are promising hosts for guest inclusion, separation, and stabilization. Well-studied examples are mainly metal-coordination-based or covalent architectures. An anion-coordination-based cage that is capable of encapsulating halocarbon guests is reported for the first time. This A4L4-type (A=anion) tetrahedral cage, [(PO4)4 L4]12−, assembled from a C3-symmetric tris(bisurea) ligand ( L) and phosphate ion (PO43−), readily accommodates a series of quasi-tetrahedral halocarbons, such as the Freon components CFCl3, CF2Cl2, CHFCl2, and C(CH3)F3, and chlorocarbons CH2Cl2, CHCl3, CCl4, C(CH3)Cl3, C(CH3)2Cl2, and C(CH3)3Cl. The guest encapsulation in the solid state is confirmed by crystal structures, while the host-guest interactions in solution were demonstrated by NMR techniques. [ABSTRACT FROM AUTHOR]

The fabrication of anion‐coordinated assemblies into functional soft materials remains a major challenge. To this end, four C2‐symmetric anion‐binding ligands equipped with ortho‐phenylene‐bridged bis(urea) and amine or amide ends were designed, which generated A2L3 triple helical architectures upon self‐assembly with phosphate ions. Hierarchical intermolecular hydrogen bonds among the terminal amine/amide groups and urea moieties resulted in the formation of functional gels. The obtained gels were further applied for conductive adhesion between different surfaces, displaying excellent flexibility and selective wettability. The viscoelastic gels constructed from anion‐coordinated assemblies described in this work represent the first example of a new class of anion‐coordination‐driven smart materials. [ABSTRACT FROM AUTHOR]

Abstract: An anion‐coordination‐based A4L6 (“A” denotes anion and “L” is ligand) tetrahedral cage was constructed by a C2‐symmetric bis‐bis(urea) ligand and phosphate anion, which showed reversible interconversion with the A2L3 triple helicate as a response to the template, concentration, or solvent. Notably, an unusual “peripheral” templation was found to be critical to stabilize the tetrahedral structure. This peripheral effect was utilized to assemble an “empty” A4L6 cage that allows the multi‐stimuli‐controlled capture/release of biologically important species such as choline and acetylcholine. [ABSTRACT FROM AUTHOR]

Adhesives, Gels, Self-Assembly, Anion Coordination, Hydrogen Bonding Inside Back Cover: Hierarchical Self-Assembly of Adhesive and Conductive Gels with Anion-Coordinated Triple Helicate Junctions (Angew. Keywords: Adhesives; Anion Coordination; Gels; Hydrogen Bonding; Self-Assembly EN Adhesives Anion Coordination Gels Hydrogen Bonding Self-Assembly 1 1 1 05/18/22 20220523 NES 220523 B The hierarchical self-assembly b of functional gels with anion-coordinated architecture junctions will open up a new avenue for the design and fabrication of a broad range of smart materials. [Extracted from the article]