単一の溶媒分子がドナー-受容体アニオンの電荷伝送帯に与える影響について
Jørgen Houmøller1, Marius Wanko, Kristian Støchkel
1Department of Physics and Astronomy, Aarhus University, Aarhus C, Denmark.
Journal of the American Chemical Society
|April 25, 2013
まとめ
単一の溶媒分子は,バイオクロモフォアアニオンの電子移行を大幅に変化させます. この研究は,水,メタノール,アセトニトリル相互作用によるm-ニトロフェノラートアニオンエネルギーの変化を定量化し,マイクロ環境効果を強調しています.
科学分野:
- 物理化学 物理化学とは
- スペクトル顕微鏡検査です.
- 計算化学はコンピュータ化学である.
背景:
- タンパク質ポケットのバイオクロモフォアアニオンは,その環境の影響を受けた電荷移転 (CT) 移行を示します.
- これらのアニオンはしばしばフェノラート電子ドナーとπ結合受容群を特徴とする.
研究 の 目的:
- m-ニトロフェノラートアニオンの電子移行エネルギーに対する単一溶剤分子の影響を調査する.
- イオン溶媒複合体における興奮状態の計算予測をベンチマークするために.
主な方法:
- アクションスペクトロスコピーは,裸のm-ニトロフェノラートアニオンと単一の水,メタノール,アセトニトリル分子の相互作用を研究するために使用されました.
- CC2の計算による予測との比較が行われました.
主要な成果:
- 単一の水とメタノール分子は0.22 eVの青いシフトを引き起こし,アセトニトリルは0.12 eVのシフトを引き起こした.
- アセトニトリルは,水とメタノールと比較してフェノラートとの結合が弱かった.
- 観測されたシフトは,CC2で予測された値と同等であり,プロティック溶媒は水素結合によるより大きなシフトを示した.
結論:
- m-ニトロフェノラートアニオンは,その分離されたドナー-受容体群によるアニオンにおけるCT刺激を研究するためのモデルとして機能します.
- 溶媒の微環境は,電子トランジションを調節する上で重要な役割を果たしており,これは,単一のアセトニトリル分子から大量溶液と比較した重要なシフトによって証明されています.
- 実験データは,イオン溶媒系における興奮状態の理論的計算の基準となる.
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