Origin of Size Specific Catalysis by Polymer-stabilized Au Clusters for Aerobic Oxidation Reactions

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  • ポリマー保護Auクラスターの空気酸化触媒作用におけるサイズ特異性とその起源
  • ポリマー ホゴ Au クラスター ノ クウキ サンカ ショクバイ サヨウ ニ オケル サイズ トクイセイ ト ソノ キゲン

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The article summarizes our recent advances on the size specific catalysis by polymer-stabilized gold clusters. We found that the smallest polymer-stabilized gold clusters (diameter = 1.3 nm) exhibit excellent activity for oxidation of alcohol, H2O2 generation from ammonium formate and molecular oxygen, and hydroxylation of dibenzylketones, by utilizing a molecular oxygen as an oxidant. The activity increases dramatically with decreasing the size down to 1 nm, which is closely correlate electronic structure of the smallest gold clusters. Various spectroscopic characterizations revealed that the smallest, active gold clusters are negatively charged through electron transfer from surrounding polymers, and as a result adsorbed molecular oxygen can be activated for the oxidation reaction through transfer of the excess electrons from the gold clusters, which are located in the high lying LUMO level of gold in the case of the smallest clusters.

Journal

  • Hyomen Kagaku

    Hyomen Kagaku 33 (7), 399-403, 2012

    The Surface Science Society of Japan

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