ディスクレート・オープン・シェル・トリス (バイピリジニウム・ラジカル・カチオン) 固体インクルージョン・コンプレックス
Ommid Anamimoghadam1, Leighton O Jones1, James A Cooper1
1Department of Chemistry, Northwestern University, 2145 Sheridan Road, Evanston, Illinois 60208, United States.
Journal of the American Chemical Society
|December 21, 2020
まとめ
研究者らは,メチルバイオゲンラジカルカチオンでインクルージョン複合体を形成する新しいサイクロファンを合成した. この研究は,宿主-ゲスト化学による有機磁気材料の設計に関する洞察を提供します.
科学分野:
- 超分子化学
- 有機物質科学
- 固体化学
背景:
- 有機基の性質は,結晶上の構造体内の基と基の相互作用によって決定される.
- サイクロファンの化学は 機能的な有機物質を設計するためのプラットフォームを提供します
研究 の 目的:
- 置換されたテトラケーション性サイクロファンの合成と特徴付け,メチルバイオゲンラジカルカチオンによるその含有複合体.
- ホスト・ゲスト結合と固体状態の特性に対するメトキシ置換剤の影響を調査する.
- 放射性物質の磁気特性を調べる
主な方法:
- サイクロビス ((パラクアット-p-1,4-ジメトキシフェニレン) の合成と特徴づけ
- ゲストの結合関係を評価するテスト
- 構造分析のためのX線微分
- 電子パラマグネティック共振 (EPR) と密度関数理論 (DFT) のスピン状態の決定.
- 超伝導量子干渉装置 (SQUID) マグネトメトリ
主要な成果:
- 縮小されたサイクロファンとメチルバイオゲンラジカルカチオン (MV• +) の1:1インクルージョン複合体が形成された.
- メトキシ置換剤は,減少したサイクロファンに対するMV•+の結合を著しく減少させた.
- X線 difraksionは,弱い分子間軌道オーバーラップを持つ 1:1複合体の離散的な上部構造を明らかにした.
- EPRとDFTは 軌道が重なり合っているため 地面回転が2倍になったことを確認しました
- SQUID測定は,関連トライラジカル複合体における1Dハイゼンベルク鎖を形成する反鉄磁気相互作用を示した.
結論:
- オーガニック・ラジカル・コンプレクスの性質に,上層構造がどのように影響するかを示しています.
- この発見は,宿主-ゲストの超分子戦略を用いた新しい有機磁気材料の設計への道を示しています.
- サイクロファンの構造の変化により 結合の親和性や磁気的行動が調整できます
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