[Au12(SR)6]2−, As Smaller 8‐Electron Gold Nanocluster Retaining an SP3‐Core. Evaluation of Bonding and Optical Properties from Relativistic DFT Calculations

Abstract : Exploring the versatility of atomically precise clusters is a relevant issue in the design of functional nanostructures. Superatomic clusters offer an ideal framework to gain further understanding of the different distinctive size-dependent physical and chemical properties. Here, we propose [Au (SR) ] as a minimal 8-electron superatom related to the prototypical [Au (SR) ] cluster, depicting half of its core-mass (2.3 kDa vs 5.0 kDa). The [Au (SMe) ] cluster fulfills a 1S 1P electronic configuration, with a distorted tetrahedral Au core further viewed as an SP -hybridized superatom. The distinctive optical properties show a blue-shift for the first relevant 1P→1D transition, in comparison to [Au (SR) ] . In addition, chiroptical activity is observed, denoting intrinsic core chirality. We expect that our results can shed light into the variation of the molecular properties according to the size-dependent properties, and serve as guidelines for further experimental exploration of minimal or ultrasmall nanoclusters.
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Alvaro Munoz-Castro, Jean-Yves Saillard. [Au12(SR)6]2−, As Smaller 8‐Electron Gold Nanocluster Retaining an SP3‐Core. Evaluation of Bonding and Optical Properties from Relativistic DFT Calculations . ChemPhysChem, Wiley-VCH Verlag, In press, ⟨10.1002/cphc.201800088⟩. ⟨hal-01812456⟩

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