Angewandte Chemie International Edition · 2015 · 171 citations · 52 references
Natural SciencesChemistryMaterials ScienceCrystal StructureNanomaterialsNanotechnologyCatalyst DesignCrystal ChemistryNanocatalysisNanomaterial CharacterizationX-ray CrystallographyX-ray DiffractionCatalytic NanomaterialsFace-centered Cubic StructureGold NanostructuresMetal NanoparticlesNanoparticlesNanostructured CatalystsNoble Metal NanoclustersSingle-crystal Crystallography
The structure of nanoparticles plays a critical role in dictating their material properties. Gold is well known to adopt face-centered cubic (fcc) structure. Herein we report the first observation of a body-centered cubic (bcc) gold nanocluster composed of 38 gold atoms protected by 20 adamantanethiolate ligands and two sulfido atoms ([Au38S2(SR)20], where R=C10H15) as revealed by single-crystal X-ray crystallography. This bcc structure is in striking contrast with the fcc structure of bulk gold and conventional Au nanoparticles, as well as the bi-icosahedral structure of [Au38(SCH2CH2Ph)24]. The bcc nanocluster has a distinct HOMO-LUMO gap of ca. 1.5 eV, much larger than the gap (0.9 eV) of the bi-icosahedral [Au38(SCH2CH2Ph)24]. The unique structure of the bcc gold nanocluster may be promising in catalytic applications.
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