ポルフィリンベースの分子ワイヤを通しての電子伝送の効率を測る
Mikael U Winters1, Emma Dahlstedt, Holly E Blades
1Department of Chemical and Biological Engineering, Physical Chemistry, Kemivägen 3, SE - 412 96 Göteborg, Sweden.
Journal of the American Chemical Society
|March 17, 2007
まとめ
この研究は,効率的な電子伝送のための分子ワイヤとして,ブタジネ関連ポルフィリンオリゴーマーを調査しています. これらのシステムは,驚くほど高速な電荷再結合を実証し,分子電子と太陽エネルギーアプリケーションの潜在能力を示しています.
科学分野:
- 分子電子 (モレキュラー・エレクトロニクス)
- フォトケミストリー フォトケミストリー
- マテリアルサイエンス 材料科学
背景:
- 遠距離電子伝達は,分子電子と太陽エネルギーにとって極めて重要です.
- 効率的な分子ワイヤの開発は,ナノメートルの距離を超えて制御された電子媒介の鍵です.
研究 の 目的:
- 分子線としてブタジネ結合のポルフィリンオリゴマーを調査する.
- これらのシステムにおける光誘導による電荷分離と再結合率を明らかにする.
- これらの構造の長距離電荷伝送の可能性を評価する.
主な方法:
- ポルフィリンオリゴマーの合成,フェロゼンとフルレンの端末.
- ポルフィリンオリゴーマーブリッジの光刺激.
- 電子伝送率を測定するための時間解像度吸収および放出スペクトロスコーピー.
主要な成果:
- 光刺激で長距離の電荷分離状態の形成.
- 驚くほど速い電荷再結合率 (kCR2 = 1.3 x 10^8 s^-1) がある.
- 弱距離依存の電荷再結合は,ポーフィリンテトラメアで65 Å以上であっても,弱距離依存である.
結論:
- ブタジネに結合したポルフィリンオリゴーマーが,効果的な分子線として機能する.
- 速く,長距離の電荷転送は達成可能であり,分子電子工学にとって重要である.
- ポルフィリンテトラメアは,長距離の電荷移転を媒介する有望な能力を示しています.
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