負荷中性ハロゲンとカルコゲン結合の折り畳み式受容体による水中のアニオン認識
Arseni Borissov1, Igor Marques2, Jason Y C Lim1
1Chemistry Research Laboratory, Department of Chemistry , University of Oxford , Mansfield Road , Oxford OX1 3TA , U.K.
Journal of the American Chemical Society
|February 8, 2019
まとめ
電荷中性無循環ホストは,初めて水中の選択的アニオン認識を可能にします. この新しい戦略は,イオジドのような大きなアニオンに対する前例のない結合 afinities を σ-ホール相互作用を使用して達成します.
科学分野:
- 超分子化学
- アニオン認識
- ホスト・ゲスト・ケミストリー
背景:
- 水中のアニオン認識は,水の高い介電常数と競争的な水分化により困難です.
- 既存の受容体はしばしばカチオンのフレームワークに依存し,水性媒体では選択性が欠けている.
- σ-ホール結合は,アニオン結合のための有望な,まだ未開発の,非共性相互作用を提供します.
研究 の 目的:
- 水中の選択的なアニオン認識のための新しい,電荷中立のホストシステムを開発する.
- 水性アニオン結合における σ-ホールのハロゲンとカルコゲン結合の有効性を調査する.
- 純粋な水中のアニオン認識の課題を克服するための新しい分子ツールを確立する.
主な方法:
- ハロゲンとカルコゲン結合ドナーを組み込んだ水溶性,折り畳み基のアサイクリックホストの設計と合成.
- 様々なアニオンによる定量結合試験のためのアイソテルミック・タイトレーション・カロリメトリー (ITC).
- 水中の結合メカニズムと複雑な構造を解明するための分子動力学 (MD) シミュレーション.
主要な成果:
- 受容体は,大きく,弱い水素化アニオン (例えば,I−,ReO4−) の非常に強く,選択的に結合することを示した.
- 2: 1ホスト-ゲスト複合体の形成は,協力的な,多歯の σ-ホールドナーによって安定化されます.
- 既知の σ-ホールの受容体を上回る,水 (β2 ~ 1.68 × 1011 M−2) で前例のないヨウ素親和性を達成した.
結論:
- 水中のアニオン認識のための電荷中性 σ-ホール相互作用を用いた新しい戦略が成功裏に実証されました.
- 開発されたレセプターは,既存のシステムと比較して優れたパフォーマンスを提供し,新しいベンチマークを確立しています.
- ハロゲンとカルコゲン結合は,水性環境でのアニオン認識を進めるための強力なツールとして検証されています.
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