Supramolecular Paradigm for Capture and Co-Precipitation of Gold(III) Coordination Complexes



A new supramolecular paradigm is presented for reliable capture and co-precipitation of haloauric acids (HAuX4) from organic solvents or water. Two classes of acyclic organic compounds act as complementary receptors (tectons) by forming two sets of directional non-covalent interactions, (a) hydrogen bonding between amide (or amidinium) NH residues and the electronegative X ligands on the AuX4 @, and (b) electrostatic stacking of the electron deficient Au center against the face of an aromatic surface. X-ray diffraction analysis of four co-crystal structures reveals the additional common feature of proton bridged carbonyls as a new and predictable supramolecular design element that creates one-dimensional polymers linked by very short hydrogen bonds (CO···OC distance <2.5 a). Two other co-crystal structures show that the amidinium-p···XAu interaction will reliably engage AuX4 @ with high directionality. These acyclic compounds are very attractive as co-precipitation agents within new “green” gold recovery processes. They also have high potential as tectons for controlled self-assembly or co-crystal engineering of haloaurate composites. More generally, the supramolecular paradigm will facilitate the design of next-generation receptors or tectons with high affinity for precious metal square planar coordination complexes for use in advanced materials, nanotechnology, or medicine.


Attribute NameValues
  • Allen G. Oliver

  • Bradley D. Smith

Journal or Work Title
  • Chemistry - A European Journal

  • 27

First Page
  • 751

Last Page
  • 757

Publication Date
  • 2020-06

  • Crystal engineering

  • Gold

  • Host-guest systems

  • self-assembly

  • supramolecular chemistry

  • Wiley-VCH GmbH

Date Created
  • 2022-11-22

  • English

Departments and Units
Creator Organization(s)
  • d

Record Visibility Public
Content License
  • All rights reserved

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