テトラバレント・テルビウム複合体の設計,分離,および光譜分析

Natalie T Rice, Ivan A Popov¹, Dominic R Russo

¹Theoretical Division , Los Alamos National Laboratory , Los Alamos , New Mexico 87545 , United States.

Journal of the American Chemical Society

|July 30, 2019

まとめ

研究者は安定した四価テリビウム複合体を合成し,高価ランタニド化学と磁気アプリケーションの詳細な研究を可能にしました. この研究は,磁性イオンにおける共性金属-リガンド結合の理解を進める.

科学分野:

無機化学
ランタニド化学
材料科学

背景:

Ce ((IV)) 以外の高価ランタニド分子複合体の合成経路は稀である.
複雑な安定性および要求の厳しい反応条件により,特徴づけは困難である.

研究の目的:

安定した高対称性テトラバレントテリウム複合体を合成し,特徴づけること.
高値ランタニドイオンの安定化におけるリガンド設計の役割を調査する.
四価ランタニドの磁気特性と電子構造を調査する.

主な方法:

S4対称リガンドフレームワークを持つ四価テリビウム複合体の合成.
磁気感受性,EPR,XANES,DFTを用いた物理的特徴づけ
三価テリビウム前駆体から四価状態への酸化.

主要な成果:

安定した4座標の四価テリウム複合体[Tb(NP(1,2-bis-tBu-ダイアミドエタン) ((NEt2)) ]を合成した.
複合体は弱いリガンドフィールドと kovalen 金属リガンド結合を示し,安定した4f7基底状態をもたらす.
三価ランタニドと移行金属の間の重要なゼロフィールド分裂が観察されました.

結論:

リガンド制御は,分子複合体内の四価ランタニドイオンを安定させるのに不可欠である.
観測された共振結合と磁気特性は,新しい磁気材料の設計に意味を持っています.
この複合体の安定性と特徴は,他の高価ランタニドの探査のための道を開きます.

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