Unprecedented Alkylzinc–Magnesium Alkoxide Clusters as Suitable Organometallic Precursors for Magnesium-Containing ZnO Nanoparticles

Authors

  • Stephan Heitz,

    1. Institute of Chemistry: Metalorganics and Inorganic Materials, Technische Universität Berlin, Strasse des 17. Juni 135, Sekr. C2, 10623 Berlin (Germany), Fax: (+49) 30-314-29732
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  • Dr. Yilmaz Aksu,

    1. Institute of Chemistry: Metalorganics and Inorganic Materials, Technische Universität Berlin, Strasse des 17. Juni 135, Sekr. C2, 10623 Berlin (Germany), Fax: (+49) 30-314-29732
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  • Dr. Christoph Merschjann,

    1. Institute for Heterogeneous Material Systems, Helmoltz-Zentrum Berlin für Materialien und Energie GmbH, Hahn-Meitner Platz 1, 14109 Berlin (Germany)
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  • Prof. Dr. Matthias Driess

    Corresponding author
    1. Institute of Chemistry: Metalorganics and Inorganic Materials, Technische Universität Berlin, Strasse des 17. Juni 135, Sekr. C2, 10623 Berlin (Germany), Fax: (+49) 30-314-29732
    • Institute of Chemistry: Metalorganics and Inorganic Materials, Technische Universität Berlin, Strasse des 17. Juni 135, Sekr. C2, 10623 Berlin (Germany), Fax: (+49) 30-314-29732
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Abstract

The synthesis and characterization of the first heterobimetallic methylzinc–magnesium alkoxide clusters [Me6MgZn6(OR)8] [R=Et (1 a), n-Pr (1 b), nBu (1 c)] with a bis-cubane-shaped MgZn6O8 core is described. The thermal degradation of 1 ac and mixtures of 1 a and the homometallic MeZn–alkoxide cubane [{MeZnOtBu}4] (2) in dry synthetic air led to wide-band-gap semiconducting MgxZn1−xO nanoparticles at temperatures below 500 °C. The final materials were characterized by different analytical techniques such as PXRD, REM, TEM, EDX, and IR spectroscopy. The morphology of the as-prepared magnesium-containing ZnO samples is influenced by the different organo groups (alkoxo) in the precursors. EDX mapping showed that magnesium is uniformly distributed in the ZnO matrix. The incorporation of magnesium led to a distortion of the ZnO lattice with increased a axis and decreased c axis parameters. Room-temperature photoluminescence (PL) spectra reveal that the near-band-edge (NBE) emission of Mg2+-doped ZnO is shifted to higher energies relative to that of pure ZnO.

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