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チオラートとセレノラート・リガンドの地域化学 黄金のクラスターでの交換
Christopher A Hosier1, Christopher J Ackerson1
1Department of Chemistry , Colorado State University , Fort Collins , Colorado 80523 , United States.
Journal of the American Chemical Society
|December 12, 2018
まとめ
この研究は,交換反応中の金塊のリガンドの位置を明らかにする. クラスター表面でのリガンドの移動を説明する,特定のリガンドの配置の好みを示しています.
科学分野:
- ナノ材料科学
- 表面化学
- 協調化学
背景:
- 金属ナノ粒子にはリガンド交換が不可欠ですが,金塊の動態を理解することは限られています.
- 以前の研究では複数の交換環境が特定されましたが,相関関係や詳細な構造の洞察はありませんでした.
- 既存の構造データは,入ってくるリガンドのわずかな部分のみの位置を明らかにした.
研究 の 目的:
- 金塊のリガンド交換の構造的詳細を包括的に解明する.
- Au25クラスターでチオラートからセレノラートへの交換中に入ってくるリガンドの正確な位置を決定する.
- 黄金のクラスターシステムにおけるリガンド交換メカニズムの構造的基礎を確立する.
主な方法:
- 金の結晶構造を合成し特徴づけました
- クラスター表面上のリガンドの原子位置を決定するためにX線結晶学を使用した.
- ティオラートとセレノラートリガンドの分布と好みを時間とともに分析した.
主要な成果:
- チオラートでセレノラートと交換されたAu25 (((SeR)) 18x (((SR)) のクラスタの18個のうち最大17個のリガンドの位置を決定した.
- チオラートとセレノラートリガンドの配置に明確な好みが見られた.
- 黄金のクラスターにおけるリガンド交換の動態に関するこれまでで最も包括的な構造データを提供した.
結論:
- この研究は,金塊のリガンド交換メカニズムの前例のない構造的証拠を提供します.
- ソルバテッドリガンド交換とクラスター間のリガンド転送の構造的基礎を特定した.
- リンガンド交換の結果,クラスター表面上のリンガンドの純変換が示された.
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