@article{213ad6a67cd44bc1a08ed258cdbe502b,
title = "Selective Separation of Hexachloroplatinate(IV) Dianions Based on Exo-Binding with Cucurbit[6]uril",
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.",
keywords = "anion separation, co-crystallization, outer-surface interactions, precious metals, resource recovery, supramolecular chemistry",
author = "Huang Wu and Yu Wang and Jones, {Leighton O.} and Wenqi Liu and Long Zhang and Bo Song and Chen, {Xiao Yang} and Stern, {Charlotte L.} and Schatz, {George C.} and Stoddart, {J. Fraser}",
note = "Funding Information: The authors thank Northwestern University (NU) for their support of this research which made use of the IMSERC X-ray facility at NU. It receives backing from the Soft and Hybrid Nanotechnology Experimental (SHyNE) Resource (NSF ECCS-1542205) and NU. The authors also acknowledge the strong support provided by the Center for Sustainable Separations of Metals (CSSM), a National Science Foundation (NSF) Center for Chemical Innovation (CCI), grant number CHE-1925708. Theoretical investigations were also supported in part by the computational resources and staff contributions provided for by the NU Quest High Performance Computing Facility, which is jointly supported by the Office of the Provost, the Office for Research, and Northwestern University Information Technology. Funding Information: The authors thank Northwestern University (NU) for their support of this research which made use of the IMSERC X‐ray facility at NU. It receives backing from the Soft and Hybrid Nanotechnology Experimental (SHyNE) Resource (NSF ECCS‐1542205) and NU. The authors also acknowledge the strong support provided by the Center for Sustainable Separations of Metals (CSSM), a National Science Foundation (NSF) Center for Chemical Innovation (CCI), grant number CHE‐1925708. Theoretical investigations were also supported in part by the computational resources and staff contributions provided for by the NU Quest High Performance Computing Facility, which is jointly supported by the Office of the Provost, the Office for Research, and Northwestern University Information Technology. Publisher Copyright: {\textcopyright} 2021 Wiley-VCH GmbH",
year = "2021",
month = aug,
day = "2",
doi = "10.1002/anie.202104646",
language = "English (US)",
volume = "60",
pages = "17587--17594",
journal = "Angewandte Chemie - International Edition",
issn = "1433-7851",
publisher = "John Wiley and Sons Ltd",
number = "32",
}