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An Inherently Chiral Au24 Framework with Double‐Helical Hexagold Strands
Authors:Mizuho Sugiuchi  Dr Yukatsu Shichibu  Prof Katsuaki Konishi
Institution:1. Graduate School of Environmental Science, Hokkaido University, Sapporo, Japan;2. Faculty of Environmental Earth Science, Hokkaido University, Sapporo, Japan
Abstract:2,3‐bis(diphenylphosphino)butane enantiomers (chiraphos, L) used as chiral auxiliaries results in the preferential formation of an unprecedented Au24 framework with inherent chirality. The crystal structure of Au24L6Cl4]2+ ( 1 ) has a square antiprism‐like octagold core twinned by two helicene‐like hexagold motifs, where the inherent chirality is associated with the helical arrangement. The clusters carrying (R,R)‐ and (S,S)‐ diphosphines had right‐ and left‐handed strands, respectively. Circular dichroism spectra showed peaks in the visible to near‐IR region, some of which did not coincide with absorption bands, suggesting the enantiomeric Au24 frameworks possess unique chiroptical properties. The Au24 frameworks were thermally robust, which could be attributed to the superatomic concept (18 e? system) and the steric constraint effects of the bridging ligand units.
Keywords:chiral structures  circular dichroism  cluster compounds  gold  phosphines
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