Fig. 3: Solid-state superstructure and intermolecular binding iso-surface of the HAuBr4·DBC⊂2β-CD cocrystal.
From: High-efficiency gold recovery by additive-induced supramolecular polymerization of β-cyclodextrin
It illustrates the mechanism of additive-induced supramolecular polymerization. a Capped-stick and space-filling representation of different views of the HAuBr4·DBC⊂2β-CD quaternary complex, showing the packing mode and dimensions of the complex. b Intermolecular binding iso-surface between β-CD and DBC, β-CD and [AuBr4]−, DBC and [AuBr4]−, respectively. c Capped-stick and space-filling representation of the one-dimensional nanostructure extending along the c-axis, in which the β-CD tori form a continuous channel occupied by alternating DBC and [AuBr4]− anions. Solvent molecules have been omitted for the sake of clarity. The “1°” represents the primary face and the “2°” represents the secondary face of β-CD. H white, C skyblue, O red, Br brown, Au yellow. d Schematic illustration of the mechanism of additive-induced supramolecular polymerization after adding various additives to the solution of β-CD and [AuBr4]− anions.
