发光双金属双坐标黄金 (I) 复合物使用Janus Carbenes
Jie Ma1, Jonas Schaab2, Sritoma Paul3
1Mork Family Department of Chemical Engineering and Materials Science, University of Southern California, Los Angeles, California 90089, United States.
Journal of the American Chemical Society
|August 29, 2023
概括
新的双金属碳金属胺 (cMa) 复合物为高效发光材料提供了设计. 这些复合体具有高光发光效率和快速辐射率,适用于有机发光器件 (OLED).
科学领域:
- 材料科学
- 摄影化学
- 无机化学
背景情况:
- 对于发光材料,正在探索碳金属胺 (cMa) 复合物.
- 设计具有较大的振荡器强度和小单元-三元能量差异 (ΔEST) 的材料对于高效的光发射至关重要.
研究的目的:
- 用桥接双碳联体合成和表征新型双金属cMa复合物.
- 研究它们的光物理性质,以便在发光材料和有机发光器件 (OLED) 中应用.
主要方法:
- 合成具有一般结构的双金属复合物 (R2N) Au(:碳─碳:) Au(NR2).
- 对依赖于溶解的吸收和排放光谱进行详细分析.
- 测量发射寿命,光发光效率和辐射速率.
- 温度依赖的发光研究,以确定单片状态的寿命和 ΔEST.
- 使用复合物作为补充剂的溶液加工OLED的制造和测试.
主要成果:
- 双金属cMa复合体具有依赖于溶解的光学特性.
- 摩尔吸收率与能量屏障对金属-连接体旋转相关.
- 观察到高光发效率 (ΦPL> > 95%) 和短的发射寿命 (200-300 ns).
- 辐射速度比单金属类型快3到4倍.
- 确定了小 ΔEST (40-50 meV) 和接近 12 ns 的单体状态寿命 (τS).
- 在高亮度下,OLED显示出高效率和低滚动.
结论:
- 呈现的双金属cMa复合体为具有优化 ΔEST和高辐射率的发光材料提供了一般的设计策略.
- 这些复合体是高性能解决方案加工OLED的有希望的候选者.
相关概念视频
03:02Colors and Magnetism
11.8K
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...
11.8K
02:42Valence Bond Theory
8.7K
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...
8.7K
02:51Metal-Ligand Bonds
20.9K
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...
20.9K
00:43Complexometric Titration: Ligands
989
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...
989
03:45Formation of Complex Ions
23.7K
A type of Lewis acid-base chemistry involves the formation of a complex ion (or a coordination complex) comprising a central atom, typically a transition metal cation, surrounded by ions or molecules called ligands. These ligands can be neutral molecules like H2O or NH3, or ions such as CN− or OH−. Often, the ligands act as Lewis bases, donating a pair of electrons to the central atom. These types of Lewis acid-base reactions are examples of a broad subdiscipline called coordination...
23.7K
01:19Complexation Equilibria: The Chelate Effect
549
In complexation reactions, metal atoms or cations interact with ligands to form donor-acceptor adducts called metal complexes. Ligands that bind through one donor site are monodentate, ligands with two donor sites are bidentate, and those with more than two donor sites are polydentate ligands. For example, ethylene diamine is a bidentate ligand that binds through two nitrogen donor atoms, forming a five-membered ring. EDTA is a polydentate ligand that binds through four oxygen and two nitrogen...
549