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

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(OH₂)₆][AuBr₄](α-cyclodextrin)₂}n chain superstructure formed during the rapid co-precipitation of α-cyclodextrin and KAuBr₄ 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 KAuBr₄ and KAuCl₄, we hypothesize that a perfect match in molecular recognition between α-cyclodextrin and [AuBr₄](-) 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 [AuBr₄](-) and [K(OH₂)₆](+) 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.

journal_name

Nat Commun

journal_title

Nature communications

authors

Liu Z,Frasconi M,Lei J,Brown ZJ,Zhu Z,Cao D,Iehl J,Liu G,Fahrenbach AC,Botros YY,Farha OK,Hupp JT,Mirkin CA,Fraser Stoddart J

doi

10.1038/ncomms2891

subject

Has Abstract

pub_date

2013-01-01 00:00:00

pages

1855

issn

2041-1723

pii

ncomms2891

journal_volume

4

pub_type

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