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J Am Chem Soc. 2013 Jul 10;135(27):10011-3. doi: 10.1021/ja404058q. Epub 2013 Jul 1.

Chiral structure of thiolate-protected 28-gold-atom nanocluster determined by X-ray crystallography.

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Department of Chemistry, Carnegie Mellon University, Pittsburgh, Pennsylvania 15213, USA.


We report the crystal structure of a new nanocluster formulated as Au28(TBBT)20, where TBBT = 4-tert-butylbenzenethiolate. It exhibits a rod-like Au20 kernel consisting of two interpenetrating cuboctahedra. The kernel is protected by four dimeric "staples" (-SR-Au-SR-Au-SR-) and eight bridging thiolates (-SR-). The unit cell of Au28(TBBT)20 single crystals contains a pair of enantiomers. The origin of chirality is primarily rooted in the rotating arrangement of the four dimeric staples as well as the arrangement of the bridging thiolates (quasi-D2 symmetry). The enantiomers were separated by chiral HPLC and characterized by circular dichroism spectroscopy.

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