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

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

Research output: Contribution to journalArticle

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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 languageEnglish
Article number1855
JournalNature Communications
Volume4
DOIs
Publication statusPublished - 2013

Fingerprint

Cyclodextrins
Gold
isolation
gold
recovery
Coprecipitation
carbohydrates
Bearings (structural)
adducts
palladium
Recovery
Molecular recognition
platinum
assembly
Palladium
inclusions
chemistry
salts
Platinum
single crystals

ASJC Scopus subject areas

  • Biochemistry, Genetics and Molecular Biology(all)
  • Chemistry(all)
  • Physics and Astronomy(all)

Cite this

Liu, Z., Frasconi, M., Lei, J., Brown, Z. J., Zhu, Z., Cao, D., ... Stoddart, J. F. (2013). Selective isolation of gold facilitated by second-sphere coordination with α-cyclodextrin. Nature Communications, 4, [1855]. https://doi.org/10.1038/ncomms2891

Selective isolation of gold facilitated by second-sphere coordination with α-cyclodextrin. / Liu, Zhichang; Frasconi, Marco; Lei, Juying; Brown, Zachary J.; Zhu, Zhixue; Cao, Dennis; Iehl, Julien; Liu, Guoliang; Fahrenbach, Albert C.; Botros, Youssry Y.; Farha, Omar K.; Hupp, Joseph T; Mirkin, Chad A.; Stoddart, J. Fraser.

In: Nature Communications, Vol. 4, 1855, 2013.

Research output: Contribution to journalArticle

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 & Stoddart, JF 2013, 'Selective isolation of gold facilitated by second-sphere coordination with α-cyclodextrin', Nature Communications, vol. 4, 1855. https://doi.org/10.1038/ncomms2891
Liu, Zhichang ; Frasconi, Marco ; Lei, Juying ; Brown, Zachary J. ; Zhu, Zhixue ; Cao, Dennis ; Iehl, Julien ; Liu, Guoliang ; Fahrenbach, Albert C. ; Botros, Youssry Y. ; Farha, Omar K. ; Hupp, Joseph T ; Mirkin, Chad A. ; Stoddart, J. Fraser. / Selective isolation of gold facilitated by second-sphere coordination with α-cyclodextrin. In: Nature Communications. 2013 ; Vol. 4.
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