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Ag7Au6: A 13-Atom Alloy Quantum Cluster

Authors

  • Thumu Udayabhaskararao,

    1. DST Unit of Nanoscience (DST UNS), Department of Chemistry, Indian Institute of Technology, Madras, Chennai 600 036 (India)
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  • Yan Sun,

    1. College of Science, California State University, East Bay, Hayward, CA 94542 (USA)
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  • Nirmal Goswami,

    1. Department of Chemical, Biological & Macromolecular Sciences, S. N. Bose National Centre for Basic Sciences, Block JD, Sector III, Salt Lake, Kolkata 700 098 (India)
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  • Samir K. Pal,

    1. Department of Chemical, Biological & Macromolecular Sciences, S. N. Bose National Centre for Basic Sciences, Block JD, Sector III, Salt Lake, Kolkata 700 098 (India)
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  • K. Balasubramanian,

    1. College of Science, California State University, East Bay, Hayward, CA 94542 (USA)
    2. Chemistry and Material Science Directorate Lawrence Livermore National Laboratory, Livermore, CA 94550 (USA)
    3. Lawrence Berkeley National Laboratory, Berkeley, CA 94720 (USA)
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  • Prof. Thalappil Pradeep

    Corresponding author
    1. DST Unit of Nanoscience (DST UNS), Department of Chemistry, Indian Institute of Technology, Madras, Chennai 600 036 (India)
    • DST Unit of Nanoscience (DST UNS), Department of Chemistry, Indian Institute of Technology, Madras, Chennai 600 036 (India)
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  • We thank the Department of Science and Technology, Government of India for constantly supporting our research program on nanomaterials. This research was supported in part by the U.S. Department of Energy under grant number DE-FG02-05ER15657 and in part by the Department of Homeland Security’s collaborative academic research program. The work at LLNL was performed under the auspices of the U.S. Department of Energy. The authors would like to acknowledge computational support on Lawrence Berkeley Lab’s National Energy Research Supercomputers (NERSC).

Abstract

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An alloy cluster containing a 13-atom core, with a composition Ag7Au6(H2MSA)10 (H2MSA=mercaptosuccinic acid) was synthesized from silver clusters by a galvanic exchange reaction. The clusters were characterized by several spectroscopic and microscopic methods. The alloy cluster shows luminescence with a quantum yield of 3.5×10−2 at room temperature. Theoretical calculations for Ag7Au6(SCH3)10 suggest a distorted icosahedral core.

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