Abstract
The recognition and separation of anions attracts attention from chemists, materials scientists, and engineers. Employing exo-binding of artificial macrocycles to selectively recognize anions remains a challenge in supramolecular chemistry. We report the instantaneous co-crystallization and concomitant co-precipitation between [PtCl6]2− dianions and cucurbit[6]uril, which relies on the selective recognition of these dianions through noncovalent bonding interactions on the outer surface of cucurbit[6]uril. The selective [PtCl6]2− dianion recognition is driven by weak [Pt−Cl⋅⋅⋅H−C] hydrogen bonding and [Pt−Cl⋅⋅⋅C=O] ion–dipole interactions. The synthetic protocol is highly selective. Recognition is not observed in combinations between cucurbit[6]uril and six other Pt- and Pd- or Rh-based chloride anions. We also demonstrated that cucurbit[6]uril is able to separate selectively [PtCl6]2− dianions from a mixture of [PtCl6]2−, [PdCl4]2−, and [RhCl6]3− anions. This protocol could be exploited to recover platinum from spent vehicular three-way catalytic converters and other platinum-bearing metal waste.
Original language | English (US) |
---|---|
Pages (from-to) | 17587-17594 |
Number of pages | 8 |
Journal | Angewandte Chemie - International Edition |
Volume | 60 |
Issue number | 32 |
DOIs | |
State | Published - Aug 2 2021 |
Keywords
- anion separation
- co-crystallization
- outer-surface interactions
- precious metals
- resource recovery
- supramolecular chemistry
ASJC Scopus subject areas
- General Chemistry
- Catalysis
Fingerprint
Dive into the research topics of 'Selective Separation of Hexachloroplatinate(IV) Dianions Based on Exo-Binding with Cucurbit[6]uril'. Together they form a unique fingerprint.Datasets
-
CCDC 2071169: Experimental Crystal Structure Determination
Wu, H. (Contributor), Wang, Y. (Contributor), Jones, L. O. (Contributor), Liu, W. (Contributor), Zhang, L. (Contributor), Song, B. (Contributor), Chen, X.-Y. (Contributor), Stern, C. L. (Contributor), Schatz, G. C. (Contributor) & Stoddart, J. F. (Contributor), Cambridge Crystallographic Data Centre, 2021
DOI: 10.5517/ccdc.csd.cc27j6xx, http://www.ccdc.cam.ac.uk/services/structure_request?id=doi:10.5517/ccdc.csd.cc27j6xx&sid=DataCite
Dataset
-
CCDC 2071167: Experimental Crystal Structure Determination
Wu, H. (Contributor), Wang, Y. (Contributor), Jones, L. O. (Contributor), Liu, W. (Contributor), Zhang, L. (Contributor), Song, B. (Contributor), Chen, X.-Y. (Contributor), Stern, C. L. (Contributor), Schatz, G. C. (Contributor) & Stoddart, J. F. (Contributor), Cambridge Crystallographic Data Centre, 2021
DOI: 10.5517/ccdc.csd.cc27j6vv, http://www.ccdc.cam.ac.uk/services/structure_request?id=doi:10.5517/ccdc.csd.cc27j6vv&sid=DataCite
Dataset
-
CCDC 2071166: Experimental Crystal Structure Determination
Wu, H. (Contributor), Wang, Y. (Contributor), Jones, L. O. (Contributor), Liu, W. (Contributor), Zhang, L. (Contributor), Song, B. (Contributor), Chen, X.-Y. (Contributor), Stern, C. L. (Contributor), Schatz, G. C. (Contributor) & Stoddart, J. F. (Contributor), Cambridge Crystallographic Data Centre, 2021
DOI: 10.5517/ccdc.csd.cc27j6tt, http://www.ccdc.cam.ac.uk/services/structure_request?id=doi:10.5517/ccdc.csd.cc27j6tt&sid=DataCite
Dataset