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Issue 36, 2017
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Anion photoelectron spectroscopy of free [Au25(SC12H25)18]

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Previous theoretical studies have shown that the thiolated gold cluster compound [Au25(SR)18] can be viewed as a prototypical superatom with a closed electronic structure. The quantized electronic structure of [Au25(SR)18] has been experimentally demonstrated by optical and electrochemical methods in the dispersed state. Nevertheless, no direct information is available on the energy levels and densities of occupied states. Here, we report the photoelectron spectrum of [Au25(SC12H25)18] isolated under vacuum for the first time. The spectrum exhibits two distinct peaks, corresponding to electron detachment from the superatomic 1P orbitals and Au 5d orbitals of the Au13 core. The adiabatic electron affinity of [Au25(SC12H25)18]0 was experimentally determined to be 2.2 eV, which is significantly smaller than that of [Au25(SCH3)18]0 predicted theoretically.

Graphical abstract: Anion photoelectron spectroscopy of free [Au25(SC12H25)18]−

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The article was received on 27 Jun 2017, accepted on 14 Aug 2017 and first published on 15 Aug 2017

Article type: Communication
DOI: 10.1039/C7NR04641C
Nanoscale, 2017,9, 13409-13412

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    Anion photoelectron spectroscopy of free [Au25(SC12H25)18]

    K. Hirata, K. Yamashita, S. Muramatsu, S. Takano, K. Ohshimo, T. Azuma, R. Nakanishi, T. Nagata, S. Yamazoe, K. Koyasu and T. Tsukuda, Nanoscale, 2017, 9, 13409
    DOI: 10.1039/C7NR04641C

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