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

Author

Listed:
  • Zhichang Liu

    (Northwestern University)

  • Marco Frasconi

    (Northwestern University)

  • Juying Lei

    (Northwestern University)

  • Zachary J. Brown

    (Northwestern University)

  • Zhixue Zhu

    (Northwestern University)

  • Dennis Cao

    (Northwestern University)

  • Julien Iehl

    (Northwestern University)

  • Guoliang Liu

    (Northwestern University)

  • Albert C. Fahrenbach

    (Northwestern University)

  • Youssry Y. Botros

    (Northwestern University
    Intel Labs, Building RNB-6-61
    National Center for Nanotechnology Research, King Abdulaziz City for Science and Technology (KACST))

  • Omar K. Farha

    (Northwestern University)

  • Joseph T. Hupp

    (Northwestern University)

  • Chad A. Mirkin

    (Northwestern University)

  • J. Fraser Stoddart

    (Northwestern University)

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.

Suggested Citation

  • 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 , 2013. "Selective isolation of gold facilitated by second-sphere coordination with α-cyclodextrin," Nature Communications, Nature, vol. 4(1), pages 1-9, October.
  • Handle: RePEc:nat:natcom:v:4:y:2013:i:1:d:10.1038_ncomms2891
    DOI: 10.1038/ncomms2891
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    Cited by:

    1. Huang Wu & Yu Wang & Chun Tang & Leighton O. Jones & Bo Song & Xiao-Yang Chen & Long Zhang & Yong Wu & Charlotte L. Stern & George C. Schatz & Wenqi Liu & J. Fraser Stoddart, 2023. "High-efficiency gold recovery by additive-induced supramolecular polymerization of β-cyclodextrin," Nature Communications, Nature, vol. 14(1), pages 1-11, December.
    2. Anne Ponchel & Eric Monflier, 2023. "Application of cyclodextrins as second-sphere coordination ligands for gold recovery," Nature Communications, Nature, vol. 14(1), pages 1-3, December.
    3. Luke M. M. Kinsman & Bryne T. Ngwenya & Carole A. Morrison & Jason B. Love, 2021. "Tuneable separation of gold by selective precipitation using a simple and recyclable diamide," Nature Communications, Nature, vol. 12(1), pages 1-8, December.
    4. Jie Luo & Xiao Luo & Mo Xie & Hao-Zhen Li & Haiyan Duan & Hou-Gan Zhou & Rong-Jia Wei & Guo-Hong Ning & Dan Li, 2022. "Selective and rapid extraction of trace amount of gold from complex liquids with silver(I)-organic frameworks," Nature Communications, Nature, vol. 13(1), pages 1-10, December.
    5. Fei Li & Jiuyi Zhu & Pengzhan Sun & Mingrui Zhang & Zhenqing Li & Dingxin Xu & Xinyu Gong & Xiaolong Zou & A. K. Geim & Yang Su & Hui-Ming Cheng, 2022. "Highly efficient and selective extraction of gold by reduced graphene oxide," Nature Communications, Nature, vol. 13(1), pages 1-9, December.

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