結晶型トリウムクラスターで σ-芳香金属結合
Josef T Boronski1, John A Seed1, David Hunger2
1Department of Chemistry and Centre for Radiochemistry Research, The University of Manchester, Oxford Road, Manchester, UK.
Nature
|August 23, 2021
まとめ
単離可能なトーリウム-トーリウム結合が 報告され 独特の結晶群が形成されました この発見は新しいアクティニドシグマ芳香結合を明らかにし,この現象を最も重い元素に拡張します.
科学分野:
- 無機化学
- 量子化学について
- 材料科学
背景:
- 金属と金属の結合は,移行金属と主要なグループ元素でよく確立されています.
- アクチニド-アクチニド結合は理論的に弱いと予測され,極端な条件下 (ガス相,低温マトリックス,またはカプセル化) でのみ観察されています.
- 以前の理論モデルは局所的結合に焦点を当てており,実験的な検証は欠けていました.
研究 の 目的:
- 通常の条件下でアクチニド-アクチニド結合を実験的に実証し,特徴づけること.
- アクティニド群の結合の性質を調査する
- アクティニドのシグマ芳香結合の可能性を調査する.
主な方法:
- 周囲の条件下で結晶のトリウムクラスタの合成と分離.
- クラスタの電子構造と結合の特徴
- 顕微鏡と結晶分析
主要な成果:
- トリウム-トリウム結合を示すトリウムクラスタの準備と分離を成功させた.
- クラスタはダイア磁性で,閉じた殻のシングレット基底状態を有する.
- ヴァレンス分散型3センター2電子シグマ芳香結合の実験的証拠が観察され,以前の理論的予測と矛盾した.
結論:
- この研究は,正常な条件下で初めて分離可能なアクチニド-アクチニド結合を報告した.
- アクティニドシグマアロマティック結合の発見は,この結合型を最も重い元素と6番目の主要な量子数に拡張します.
- この研究は,アクチニドとアクチニドの相互作用を理解し,利用するための新しい道を開きます.
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