化学的に反転可能な無機クラスターの異体化
Curtis B Williamson1, Douglas R Nevers1, Andrew Nelson2
1Robert F. Smith School of Chemical and Biomolecular Engineering, Cornell University, Ithaca, NY, USA.
Science (New York, N.Y.)
|February 16, 2019
まとめ
カドミウム硫化物 (CdS) クラスターは分子イソメリゼーションと固体変異を橋渡しする. これらの原子的に正確なクラスターは 拡散なしの再構成を示し,構造の変化の中間状態を明らかにします.
科学分野:
- 材料科学
- ナノテクノロジー
- 化学物理学
背景:
- 構造的変換は通常,孤立した分子または固体システムで研究されます.
- これらの変換の中間状態は 実験的に特徴づけるのが困難でした
- 原子的に正確なクラスターは このような現象を研究するための 潜在的プラットフォームを提供します
研究 の 目的:
- 明確に定義された,原子的に正確な硫化カドミウム (CdS) クラスターシステムにおける異体化を調査する.
- 分子イソメリゼーションと固体-固体変換の研究を橋渡しする.
- 構造変化における中間システムを特徴づける.
主な方法:
- カドミウム硫化物 (CdS) のクラスターイソマーを実験プラットフォームとして利用した.
- クラスター同位体間のコヒーレントな相互変換を研究した.
- エネルギー・バリアと エクシトン・エネルギー・ギャップのシフトを分析した
- リガンド結合モチーフとヒドロキシル種の役割を調査した.
主要な成果:
- CdSクラスターイソメアは, ~1電子ボルトのエネルギーバリア上で一貫して相互変換する.
- 140ミリエレクトロンのボルトの振動エネルギーギャップが観察されました.
- 固体-固体変換に類似した 無機核の分散型再構成が発生した.
- 変異動態は分子イソメリゼーションに似ている.
- 水酸化物によって影響される表面エネルギーは,相安定性を決定する.
結論:
- CdSクラスターは,長さスケールの異体化を研究するための有利なプラットフォームとして機能します.
- 観測された変換は,固体-固体変換と分子イソメリゼーションの両方の特徴を示している.
- この研究は分子と固体構造の変化のギャップを埋めています
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