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

zhpd55 添加于 2013/5/19 9:10:16  636次阅读 | 1次推荐 | 0个评论

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.

作 者: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
期刊名称: Nature Communications
期卷页: Published 14 May 2013 第4卷 第期 1855页
学科领域:化学科学 » 有机化学 » 应用有机化学
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原文链接:http://www.nature.com/ncomms/journal/v4/n5/pdf/ncomms2891.pdf
DOI: 10.1038/ncomms2891
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