閉じた電子殻を持つ金属カルコゲニドクラスターとアルカリとハロゲンの電子特性
Vikas Chauhan1, Arthur C Reber1, Shiv N Khanna1
1Department of Physics, Virginia Commonwealth University , Richmond, Virginia, United States.
Journal of the American Chemical Society
|January 14, 2017
まとめ
コバルトテルリドのクラスターにおけるリガンド交換は,電子ドナーを受容体に変換する. この研究では,Co6Te8(PEt3) 6は低イオン化エネルギーを持ち,Co6Te8(CO) 6はハロゲンのような電子受容体特性を持ち,どちらも安定した電子殻を持っています.
科学分野:
- 無機化学
- 材料科学
- コンピュータ化学
背景:
- 電子殻が満たされ,最も高い分子軌道 (HOMO) と最も低い無分子軌道 (LUMO) のギャップが大きいクラスターは安定している.
- クラスタの電子特性 (イオン化エネルギー,電子親和) を調節すると,通常は,バレンスの電子数値が変化します.
研究 の 目的:
- 金属クラスターの電子的役割をドナーから受容体へと切り替える方法として,リガンド交換を実証する.
- Co6Te8 ((PEt3) m ((CO) nクラスタの電子特性を調査する.
主な方法:
- 異なるフォスフィン (PEt3) とカルボニル (CO) リガンドを持つコバルトテルリドクラスターの合成と特徴付け.
- イオン化エネルギーと電子親和の実験的決定.
- HOMO-LUMOギャップを含む電子構造の分析
主要な成果:
- Co6Te8(PEt3) 6は,低電離エネルギー (4.74 eV) と1.24 eVのHOMO-LUMOギャップを持つ閉じた電子殻を示している.
- Co6Te8 ((PEt3) m ((CO) nにおけるCOリガンドによるPEt3の連続的な置換は,高電子親和性と1.39 eVのHOMO-LUMOギャップを持つハロゲン型の電子受容体として振る舞うCo6Te8 ((CO) 6につながります.
- 偶数のリガンドを持つクラスターは,金属核の周りに対称なリガンド配列を採用する.
結論:
- リガンド交換は,金属クラスタの核構造やバレンスの電子数を変えることなく,電子機能を調節するための実行可能な戦略を提供します.
- これらの発見は,金属クラスターに基づく電子ドナーおよび受容器材料の設計に新しい可能性を提供します.
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