プラチナにおける電荷輸送に対するリガンド効果 (((II) アセチリド
Terence L Schull1, James G Kushmerick, Charles H Patterson
1Center for Bio/Molecular Science and Engineering, Laboratory for the Structure of Matter, Naval Research Laboratory, Washington, DC 20375, USA. schull@nrl.navy.mil
Journal of the American Chemical Society
|March 13, 2003
まとめ
この研究では,分子導体としての有機金属複合体を調査しました. 研究者は,リガンド効果ではなくトンネリング効率が,これらの分子ワイヤの電気伝導を決定することを発見しました.
科学分野:
- マテリアルサイエンス 材料科学
- ナノテクノロジー ナノテクノロジー
- 有機金属化学 有機金属化学
背景:
- 有機金属複合体は,分子導体としての可能性を秘めています.
- Pi結合システムは,分子ワイヤの電荷輸送に不可欠である.
研究 の 目的:
- 有機金属のpi結合分子を合成し,特徴づけること.
- 分子伝導体としてのそれらの電気的特性を調査するために.
- 料金輸送に影響を与える要因を決定する.
主な方法:
- トランス-[PtL2(CCC6H4SAc-4)2]複合体の合成,様々なフォスフィンリガンド (L) を含む.
- NMR,IR,UV,X線スペクトロスコピーを用いた特徴化.
- 電流-電圧 (I-V) 特徴の測定は,クロスワイヤ・ジャンクション技術を用いて行われます.
主要な成果:
- 顕微鏡検査で,リガンドとPIシステムとの間の電子相互作用が確認されました.
- 分子単層の電気測定は,伝導にリガンド効果を示さなかった.
- トンネリング効率は,導電の主要な要因として特定されました.
- 移行金属の組み込みは,炭素ベースのワイヤと比較して,電荷輸送を妨げなかった.
結論:
- これらの金属-分子-金属システムにおける電荷輸送は,トンネルの効率によって支配されます.
- オルガノメタリック複合体は,すべての炭素系と比較して,活性の高い分子導体である.
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