Highly Efficient and Selective Recognition of Dicyanoaurate(I) by a Bambusuril Macrocycle in Water

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Authors	RANDO Carola VAZQUEZ GONZALVEZ Julian SOKOLOV Jan KOKAN Zoran NEČAS Marek ŠINDELÁŘ Vladimír
Year of publication	2022
Type	Article in Periodical
Magazine / Source	Angewandte Chemie International Edition
MU Faculty or unit	Faculty of Science
Citation
Web	https://onlinelibrary.wiley.com/doi/10.1002/anie.202210184
Doi	http://dx.doi.org/10.1002/anie.202210184
Keywords	Anion Binding; Bambusurils; Dicyanoaurate; Gold Extraction; Host-Guest Complexes
Description	Dicyanoaurate(I) anion, [Au(CN)(2)](-), plays a central role in the current industrial production of gold, as its extraction from crude ore samples represents the most money-consuming step. Herein, we present the strongest host-guest recognition of dicyanoaurate anion using the bambusuril receptor in water, a highly competitive solvent. The micromolar stability of such a complex facilitated the up to date most efficient supramolecular stripping of dicyanoaurate from activated carbon at ambient temperature. Thermodynamic characteristics of bambusuril binding with [Au(CN)(2)](-) differing from binding of other inorganic chaotropic anions are rationalized, as well as the bambusuril selectivity for [Au(CN)(2)](-) over [Ag(CN)(2)](-).
Related projects:	CETOCOEN Excellence CETOCOEN Excellence Czech Infrastructure for Integrative Structural Biology Monofunkcializované bambusurily a jejich supramolekulární vlastnosti RECETOX RI