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ACS Combinatorial Science

ACS Combinatorial Science

IF: 3.77
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Selective isolation of gold facilitated by second-sphere coordination with α-cyclodextrin.

Published:1 January 2013 DOI: 10.1038/ncomms2891 PMID: 23673640
Zhichang Liu, Marco Frasconi, Juying Lei, Zachary J Brown, Zhixue Zhu, Dennis Cao, Julien Iehl, Guoliang Liu, Albert C Fahrenbach, Youssry Y Botros, Omar K Farha, Joseph T Hupp, Chad A Mirkin, J Fraser Stoddart

Abstract

Gold recovery using environmentally benign chemistry is imperative from an environmental perspective. Here we report the spontaneous assembly of a one-dimensional supramolecular complex with an extended {[K(OH?)?][AuBr?](α-cyclodextrin)?}n chain superstructure formed during the rapid co-precipitation of α-cyclodextrin and KAuBr? in water. This phase change is selective for this gold salt, even in the presence of other square-planar palladium and platinum complexes. From single-crystal X-ray analyses of six inclusion complexes between α-, β- and γ-cyclodextrins with KAuBr? and KAuCl?, we hypothesize that a perfect match in molecular recognition between α-cyclodextrin and [AuBr?](-) leads to a near-axial orientation of the ion with respect to the α-cyclodextrin channel, which facilitates a highly specific second-sphere coordination involving [AuBr?](-) and [K(OH?)?](+) and drives the co-precipitation of the 1:2 adduct. This discovery heralds a green host-guest procedure for gold recovery from gold-bearing raw materials making use of α-cyclodextrin-an inexpensive and environmentally benign carbohydrate.

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Related products
Procduct Name CAS Molecular Formula Supplier Price
α-Cyclodextrin 10016-20-3 C36H60O30 438 suppliers $5.00-$3120.00

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