フェノキザインを還元性フォトレドックス触媒として調整するための構造-特性関係
Blaine G McCarthy1, Ryan M Pearson1, Chern-Hooi Lim1
1Department of Chemistry , Colorado State University , Fort Collins , Colorado 80523-1872 , United States.
Journal of the American Chemical Society
|March 8, 2018
まとめ
研究者らは,可視光吸収有機フォトレドックス触媒 (PC) を開発し,ポリメリゼーションの特性を調整した. これらのフェノキサジン誘導体は,ポリマー生産を含む様々な有機合成の可能性を示しています.
科学分野:
- 有機化学
- 写真化学
- ポリマー化学
背景:
- 可視光吸収有機光還元触媒 (PC) は,持続可能な合成に不可欠です.
- フェノキサジン誘導体は有機PCとして有望であることが示されていますが,それらの構造-特性関係はさらなる解明を必要としています.
研究 の 目的:
- 光を吸収する 有機フォトレドックス触媒として新しいフェノキサジン誘導体を設計し合成する.
- これらの誘導体の構造-性質関係を調査し,興奮状態の性質と触媒活動に焦点を当てます.
- オーガノカタライズド・アトム・トランスファー・ラジカル・ポリメリゼーション (O-ATRP) の性能を評価する.
主な方法:
- 時間依存密度関数理論 (TD-DFT) モデリングを含む実験的および計算分析の組み合わせを使用した.
- 合成され,特徴づけられたN-アリルおよびコア改変フェノキザイン誘導体.
- 白光照射下でポリメチルメタクリlate (PMMA) の合成のためのO-ATRPで評価された触媒活性.
主要な成果:
- 移行金属PCに匹敵する興奮状態の減少ポテンシャルを持つフェノキサジン誘導体を開発した.
- N-アリル置換剤が電荷移転興奮状態に影響を及ぼし,コア改変により異なるCT興奮状態が可能であることを実証した.
- すべての誘導体はO-ATRPに適しており,制御された分子量と低分散性を有するPMMAを生成します.
- 強い可視光吸収とトリプル興奮状態の減少ポテンシャルが持続的なポリメリゼーション制御の鍵であることを特定しました.
結論:
- フェノキサジンベースの有機PCの構造-特性関係が確立された.
- これらの発見は,O-ATRPやその他の光レドックス触媒反応のための有機PCの合理的な設計を可能にします.
- フェノキサジン誘導体は,フォトレドックス誘導体の移行金属誘導体に対する有効な代替品である.
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