調整可能な光学特性を持つN-ヘテロサイクリックカルベン安定化硬貨金属カルコゲニドフレーム
Alexander M Polgar1, Florian Weigend2,3, Angel Zhang1
1Department of Chemistry, The University of Western Ontario , London, Ontario N6A 5B7, Canada.
Journal of the American Chemical Society
|September 28, 2017
まとめ
コインメタル (Ag,Au) とカルコゲン (S,Se,Te) を含む新しい発光金塊が合成されました. 調節可能な光は電子変換から生じ,光放出特性を制御します.
科学分野:
- 無機化学
- 材料科学
- 写真化学
背景:
- N-ヘテロサイクリックカルベン (NHCs) は,有機金属化学における多用途リガンドである.
- 金 ((I) カルコゲニドクラスターは,その光発光特性のために興味があります.
研究 の 目的:
- 八核硬貨金属カルコゲニドのクラスタを合成し,特徴づけること.
- 光発光特性と放射能に影響を与える要因を調査する.
主な方法:
- [Au4M4(μ3-E) 4(IPr) 4クラスター (M = Ag, Au; E = S, Se, Te) の合成は,NHC結合金 ((I) 前駆物質と金属アセテートを使用する.
- 光発光スペクトロスコピーは,ガラスのような2メチルテトラヒドロフーランと固体状態で77Kです.
- 電子移行を分析するための時間依存密度関数理論 (TD-DFT) 計算.
主要な成果:
- NHCリガンドによって安定した新種の八核金銀と金金カルコゲニドの合成に成功しました.
- 調節可能な放出エネルギーによる合成クラスターからの光の観測.
- TD-DFT計算では,調節可能な放出は,混合リガンド-メタル-メタル-電荷移転 (IPr → AuM2) とインターリガンド (IPr → E) の光特性によるものであることが明らかになった.
結論:
- NHCリガンドは,制御された金属とカルコゲン組成で,発光黄金の選択的合成を可能にします.
- 調節可能な光は,光電子装置での応用の可能性を提供します.
- この研究は,発光硬貨金属カルコゲニド化学の範囲を広げています.
さらに関連する動画
07:14Author Spotlight: Experimental Approaches for the Synthesis of Low-Valent Metal-Organic Frameworks from Multitopic Phosphine Linkers
Published on: May 12, 2023
3.8K
08:25Development of Heterogeneous Enantioselective Catalysts using Chiral Metal-Organic Frameworks MOFs
Published on: January 17, 2020
7.8K
関連する概念動画
03:02Colors and Magnetism
14.2K
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...
14.2K
02:34Structural Isomerism
21.8K
Isomerism in Complexes
Isomers are different chemical species that have the same chemical formula. Structural isomerism of coordination compounds can be divided into two subcategories, the linkage isomers and coordination-sphere isomers.
Linkage isomers occur when the coordination compound contains a ligand that can bind to the transition metal center through two different atoms. For example, the CN− ligand can bind through the carbon atom or through the nitrogen atom. Similarly, SCN− can...
Isomers are different chemical species that have the same chemical formula. Structural isomerism of coordination compounds can be divided into two subcategories, the linkage isomers and coordination-sphere isomers.
Linkage isomers occur when the coordination compound contains a ligand that can bind to the transition metal center through two different atoms. For example, the CN− ligand can bind through the carbon atom or through the nitrogen atom. Similarly, SCN− can...
21.8K
02:52Stereoisomerism
14.1K
Isomerism in Complexes
Isomers are different chemical species that have the same chemical formula.
Transition metal complexes often exist as geometric isomers, in which the same atoms are connected through the same types of bonds but with differences in their orientation in space. Coordination complexes with two different ligands in the cis and trans positions from a ligand of interest form isomers. For example, the octahedral [Co(NH3)4Cl2]+ ion has two isomers (Figure 1) In the cis...
Isomers are different chemical species that have the same chemical formula.
Transition metal complexes often exist as geometric isomers, in which the same atoms are connected through the same types of bonds but with differences in their orientation in space. Coordination complexes with two different ligands in the cis and trans positions from a ligand of interest form isomers. For example, the octahedral [Co(NH3)4Cl2]+ ion has two isomers (Figure 1) In the cis...
14.1K
02:58Crystal Field Theory - Octahedral Complexes
31.1K
Crystal Field Theory
To explain the observed behavior of transition metal complexes (such as colors), a model involving electrostatic interactions between the electrons from the ligands and the electrons in the unhybridized d orbitals of the central metal atom has been developed. This electrostatic model is crystal field theory (CFT). It helps to understand, interpret, and predict the colors, magnetic behavior, and some structures of coordination compounds of transition metals.
CFT focuses on...
To explain the observed behavior of transition metal complexes (such as colors), a model involving electrostatic interactions between the electrons from the ligands and the electrons in the unhybridized d orbitals of the central metal atom has been developed. This electrostatic model is crystal field theory (CFT). It helps to understand, interpret, and predict the colors, magnetic behavior, and some structures of coordination compounds of transition metals.
CFT focuses on...
31.1K
01:09Complexation Equilibria: Factors Influencing Stability of Complexes
878
In complexation reactions, metal cations are the electron pair acceptors, and the ligands are the electron pair donors. The stability of the metal complexes depends primarily on the complexing ability of the central metal ion and the nature of the ligands. Generally, the complexing ability of the metal ion depends on the size and charge of the ion. As the metal ion size increases, the stability of the metal complexes decreases, provided that the valency of the metal ion and the ligands remain...
878