発光セリウム (III) コンプレックスとポリ (mercaptoimidazolyl) ボレート:S-コーディネートリガンドに基づく新しいエミッター
Jiayin Zheng1, Ruoyao Guo1, Hao Qi1
1Beijing National Laboratory for Molecular Sciences, State Key Laboratory of Rare Earth Materials Chemistry and Applications, College of Chemistry and Molecular Engineering, Peking University, Beijing 100871, China.
Journal of the American Chemical Society
|February 7, 2025
まとめ
新しいS-コーディネートセリウム (III) 複合体は,驚くべき空気安定性と調節可能な発光性を示しています. この研究は,高度な発光材料を開発するための硫黄ドナーリガンドの可能性を強調しています.
科学分野:
- 協調化学
- 材料科学
- フォト物理学
背景:
- 硬いルイス酸であるランタニドイオンは通常,柔らかい硫黄ドナーと弱い結合を形成し,S-調整リガンド複合体の発達を阻害する.
- 現存する光ランタニド複合体は主に硬質の窒素または酸素ドナーリガンドを使用し,硫黄ドナー系は発達していない.
研究 の 目的:
- ポリメルカプトイマゾリルボレートリガンドを用いた新しいS-調整セリウム (III) 複合体の設計と合成.
- 新しく開発されたセリウム (III) 複合体の発光特性と空気安定性を調査する.
- 放出メカニズムと光発光量子収量 (PLQY) へのリガンド構造の影響を調査する.
主な方法:
- トリデント酸とテトラデント酸ポリメルカプトイマゾリルボレートリガンドを用いた2連鎖のS座標セリウム (III) 複合体の合成.
- 放射色とメカニズム (d-f 移行,遅延された d-f 移行,リガンド中心の光/光) を含む,光特性.
- 光発光量 (PLQY) を時間的に監視し,分解経路を調査することによって,空気安定性を評価する.
主要な成果:
- 中等から良好な空気安定性を示す発光S-コーディネートセリウム (III) 複合体を成功裏に合成した.
- 調節可能な光度が達成され,最大PLQYが97%で青と黄色緑の放射を発生します.
- 最高の複合体は空気中に1ヶ月後に74%のPLQYを保持し,硫黄酸化によるSO結合への分解が確認されました.
結論:
- S-調整リガンドは,安定した,発光するセリウム (III) 複合体を形成する大きな可能性を示している.
- リガンドの設計は,放出特性を調節し,セリウム (III) 複合体の安定性を高めるために不可欠です.
- この研究は,柔らかいドナーリガンドを用いた高度なセリウム (III) 材料の開発のための新たな道を開く.
関連する概念動画
03:02Colors and Magnetism
11.5K
Color in Coordination Complexes
When atoms or molecules absorb light at the proper frequency, their electrons are excited to higher-energy orbitals. For many main group atoms and molecules, the absorbed photons are in the ultraviolet range of the electromagnetic spectrum, which cannot be detected by the human eye. For coordination compounds, the energy difference between the d orbitals often allows photons in the visible range to be absorbed and emitted, which is seen as colors by the human...
When atoms or molecules absorb light at the proper frequency, their electrons are excited to higher-energy orbitals. For many main group atoms and molecules, the absorbed photons are in the ultraviolet range of the electromagnetic spectrum, which cannot be detected by the human eye. For coordination compounds, the energy difference between the d orbitals often allows photons in the visible range to be absorbed and emitted, which is seen as colors by the human...
11.5K
01:14Photoluminescence: Applications
367
Photoluminescence offers a wide range of applications due to its inherent sensitivity and selectivity. This technique allows for both direct and indirect analyses of the analyte. Direct quantitative analysis is possible when the analyte exhibits a favorable quantum yield for fluorescence or phosphorescence. However, an indirect analysis may be feasible if the analyte is not fluorescent or phosphorescent, or if the quantum yield is unfavorable. Indirect methods include reacting the analyte with...
367
02:42Valence Bond Theory
8.4K
Coordination compounds and complexes exhibit different colors, geometries, and magnetic behavior, depending on the metal atom/ion and ligands from which they are composed. In an attempt to explain the bonding and structure of coordination complexes, Linus Pauling proposed the valence bond theory, or VBT, using the concepts of hybridization and the overlapping of the atomic orbitals. According to VBT, the central metal atom or ion (Lewis acid) hybridizes to provide empty orbitals of suitable...
8.4K
02:51Metal-Ligand Bonds
20.5K
The hemoglobin in the blood, the chlorophyll in green plants, vitamin B-12, and the catalyst used in the manufacture of polyethylene all contain coordination compounds. Ions of the metals, especially the transition metals, are likely to form complexes.
In these complexes, transition metals form coordinate covalent bonds, a kind of Lewis acid-base interaction in which both of the electrons in the bond are contributed by a donor (Lewis base) to an electron acceptor (Lewis acid). The Lewis acid in...
In these complexes, transition metals form coordinate covalent bonds, a kind of Lewis acid-base interaction in which both of the electrons in the bond are contributed by a donor (Lewis base) to an electron acceptor (Lewis acid). The Lewis acid in...
20.5K
00:43Complexometric Titration: Ligands
878
Different monodentate and polydentate ligands are used as complexing agents in complexometric titration reactions. The formation of complexes by mono- and bidentate ligands involves two or more intermediate steps, limiting their use as complexing agents. In comparison, polydentate ligands can form complexes with metal ions in a single-step process, facilitating sharper end points. This means polydentate ligands, such as amino carboxylic acid derivatives, are most commonly employed in...
878
01:23Photoluminescence: Fluorescence and Phosphorescence
1.5K
Photoluminescence is a process where a molecule absorbs light energy and re-emits it in the form of light. This phenomenon occurs when a substance absorbs photons, promoting its electrons to higher energy level excited states, followed by a relaxation process in which the electrons return to their original ground state energy levels and emit light. Photoluminescence is widely observed in various materials, including semiconductors, and organic and inorganic compounds.
A pair of electrons in a...
A pair of electrons in a...
1.5K