Transformative Binding and Release of Gold Guests from a Self-Assembled Cu8L4 Tube


  • This work was supported by the European Research Council, the US Army Research Office, and the Marie Curie IIF Scheme of the 7th EU Framework Program. We thank the EPSRC Mass Spectrometry Service at Swansea for FT-ICR MS experiments, Dr. Peter Grice for help with NMR experiments, and the EPSRC National Crystallography Service and Dr. John E. Davis for crystallographic data collection.


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Totally tubular: A linear M8L48+ receptor, which binds tightly and selectively to the dicyanoaurate anion, was assembled from simple organic subcomponents and copper(I) ions. The guest complex is not bound unchanged, but instead is transformed into a longer linear complex where two dicyanogold units are bridged by a central cation of copper/silver (see scheme). This complex optimally fills the cavity of the receptor but is not observed in the absence of the host.