オルガノメタリック単分子電子: Fe-X-Auのアンカリングスキームを協調性から共振性へと変化させることで,X (ディフォスフィン) 2FeC4Fe (ディフォスフィン) 2Xの構成要素を通じた電子輸送を調節する
Franziska Lissel1, Florian Schwarz, Olivier Blacque
1Department of Chemistry, University of Zurich , Winterthurerstrasse 190, CH-8057 Zürich, Switzerland.
Journal of the American Chemical Society
|September 19, 2014
まとめ
研究者らは,高伝導性分子ワイヤを作成するために新しい有機金属複合体を開発しました. これらの分子輸送接合点における共性C-Au結合は,電流のノイズを大幅に軽減し,伝導性を改善し,低オームのアプリケーションに有望にしました.
科学分野:
- 有機金属化学 有機金属化学
- 分子電子 (モレキュラー・エレクトロニクス)
- マテリアルサイエンス 材料科学
背景:
- FeC4Feコアを持つ有機金属複合体は,リドックス活性センターとsp-ブリッジングリガンドにより,電子機能を提供します.
- 高伝導性の分子ワイヤーを達成するには,分子輸送結節に対するアンカーグループの影響を理解する必要があります.
研究 の 目的:
- 新規のX ((深) 2FeCC-CCFe ((深) 2X複合体を設計・合成する.
- 様々なアンカーグループ (X) が有機金属分子輸送結節の性能に与える影響を調査する.
- これらの複合体の高伝導性分子線としての可能性を評価する.
主な方法:
- 元素分析,X線 difraktion,サイクルボルトメトリ,NMR,IR,ラマンスペクトロスコーピーを用いて11の有機金属複合体 (1-11) の合成と特徴付け.
- HOMO/LUMOエネルギーを決定するための密度関数理論 (DFT) 計算.
- 電気伝導度を測定するために,機械的に制御可能な断路における複合体5-9の調査.
主要な成果:
- コーディネーティブ・バインディング・エンドグループ (NCSe,NCS) の複合体は,低電流 (それぞれ1.3 × 10−9 A,1.8 × 10−10 A) を示した.
- コンプレックス5とコンプレックス6は,SnMe3の分裂後,相関性C-Au結合を形成し,かなり高い電流 (それぞれ6.5×10−7Aと2.1×10−7A) を生成した.
- Au-5'-Au結合は,その長さ (~2 nm) にかかわらず,最大電流の1%に近づいており,協調アンカリングと比較して電流の騒音がかなり減少しています.
結論:
- 有機金属複合体における共性C-Au結合は,分子輸送結節の構築に優れた方法を提供します.
- これらのC-Au結合複合体は,高伝導性と低ノイズにより,低オーム分子電線として優れた潜在能力を示しています.
- アンカーグループの選択は,電子アプリケーションの分子結合の性能に重大な影響を及ぼします.
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