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 2) 6 ][AuBr 4 ](α-cyclodextrin) 2 } n chain superstructure formed during the rapid co-precipitation of α-cyclodextrin and KAuBr 4 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 4 and KAuCl 4, we hypothesize that a perfect match in molecular recognition between α-cyclodextrin and [AuBr 4 ] - 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 4 ] - and [K(OH 2) 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.
Original language | English (US) |
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Article number | 1855 |
Journal | Nature communications |
Volume | 4 |
DOIs | |
State | Published - 2013 |
ASJC Scopus subject areas
- General Chemistry
- General Biochemistry, Genetics and Molecular Biology
- General Physics and Astronomy
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CCDC 918414: Experimental Crystal Structure Determination
Liu, Z. (Creator), Frasconi, M. (Creator), Lei, J. (Creator), Brown, Z. J. (Creator), Zhu, Z. (Creator), Cao, D. (Creator), Iehl, J. (Creator), Liu, G. (Creator), Fahrenbach, A. C. (Creator), Botros, Y. Y. (Creator), Farha, O. K. (Creator), Hupp, J. T. (Creator), Mirkin, C. A. (Creator) & Stoddart, J. F. (Creator), Cambridge Crystallographic Data Centre, 2013
DOI: 10.5517/ccztp8q, http://www.ccdc.cam.ac.uk/services/structure_request?id=doi:10.5517/ccztp8q&sid=DataCite
Dataset
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CCDC 918416: Experimental Crystal Structure Determination
Liu, Z. (Creator), Frasconi, M. (Creator), Lei, J. (Creator), Brown, Z. J. (Creator), Zhu, Z. (Creator), Cao, D. (Creator), Iehl, J. (Creator), Liu, G. (Creator), Fahrenbach, A. C. (Creator), Botros, Y. Y. (Creator), Farha, O. K. (Creator), Hupp, J. T. (Creator), Mirkin, C. A. (Creator) & Stoddart, J. F. (Creator), Cambridge Crystallographic Data Centre, 2013
DOI: 10.5517/ccztpbs, http://www.ccdc.cam.ac.uk/services/structure_request?id=doi:10.5517/ccztpbs&sid=DataCite
Dataset
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CCDC 918417: Experimental Crystal Structure Determination
Liu, Z. (Creator), Frasconi, M. (Creator), Lei, J. (Creator), Brown, Z. J. (Creator), Zhu, Z. (Creator), Cao, D. (Creator), Iehl, J. (Creator), Liu, G. (Creator), Fahrenbach, A. C. (Creator), Botros, Y. Y. (Creator), Farha, O. K. (Creator), Hupp, J. T. (Creator), Mirkin, C. A. (Creator) & Stoddart, J. F. (Creator), Cambridge Crystallographic Data Centre, 2013
DOI: 10.5517/ccztpct, http://www.ccdc.cam.ac.uk/services/structure_request?id=doi:10.5517/ccztpct&sid=DataCite
Dataset