在S-Heteroaryl Tetradentate Pt(S^C^N^O) 复合体中启用Pt-S键的温度依赖光
Feng Zhan1, Guo-Liang Lin1, Teng-Shuo Zhang1
1College of Chemical Engineering, State Key Laboratory Breeding Base of Green-Chemical Synthesis Technology, Zhejiang University of Technology, Hangzhou, Zhejiang 310014, PR China.
Inorganic chemistry
|May 2, 2024
概括
这项研究引入了具有硫键的新复合物,揭示了温度依赖的发光. 这些独特的 (II) 复合体表现出由于激发状态的改变而产生的双重发射和光谱变化.
科学领域:
- 协调化学 协调化学
- 材料科学 材料科学 材料科学
- 光物理学的光学物理学
背景情况:
- 四 ((II) 复合物正在探索发光应用.
- 特定的金属-联体键的作用,如-硫 (Pt-S),在决定光物理性质方面具有显著的兴趣.
研究的目的:
- 为了合成和表征罕见的S-heteroaryl tetradentate platinum(II) 含有Pt-S键的发光复合物.
- 为了研究这些新型复合物的温度依赖的光发射行为.
- 阐明底层的光物理机制,包括双排放现象和兴奋状态动态.
主要方法:
- (II) 复合物的合成,特别是PtSZ和PtSZtBu.
- 实验性表征包括温度依赖的发光光谱学.
- 计算研究 (例如,潜在能量表面分析,轨道组成分析) 以了解激发状态行为.
主要成果:
- 成功合成了具有 Pt-S 键的 PtSZ 和 PtSZtBu 复合体.
- 在Pt(S^C^N^O) 复合体中观察温度依赖的光辐射.
- PtSZtBu在250K以上呈现双排放和双指数衰变,这归因于T1状态潜在能量表面的两个最小值.
- 实验和计算数据显示,温度诱导的轨道组成变化 (Pt(dxy) -S(px) 和Ptyz-Sz) 影响了兴奋状态衰变路径.
结论:
- 四牙Pt(II) 复合体中的Pt-S键对于独特的温度依赖的排放性质至关重要.
- 双排放和改变激发状态的动态与潜在能量表面上多个能量最小值的形成有关.
- 这项研究为设计新的基于 Pt-S 键的发光材料和理解它们的光物理提供了洞察力.
更多相关视频
相关概念视频
01:26Variables Affecting Phosphorescence and Fluorescence
498
Fluorescence and phosphorescence are essential phenomena in fields like analytical chemistry, biological imaging, and materials science, where they detect molecular properties and visualize cellular structures. Understanding the variables that influence these luminescent behaviors is crucial for maximizing accuracy and efficiency in their applications. These variables can broadly be grouped into chemical structure, solvent properties, and external conditions, each playing a distinct role in...
498
02:46Crystal Field Theory - Tetrahedral and Square Planar Complexes
42.4K
Tetrahedral Complexes
Crystal field theory (CFT) is applicable to molecules in geometries other than octahedral. In octahedral complexes, the lobes of the dx2−y2 and dz2 orbitals point directly at the ligands. For tetrahedral complexes, the d orbitals remain in place, but with only four ligands located between the axes. None of the orbitals points directly at the tetrahedral ligands. However, the dx2−y2 and dz2 orbitals (along the Cartesian axes) overlap with the ligands less than the dxy,...
Crystal field theory (CFT) is applicable to molecules in geometries other than octahedral. In octahedral complexes, the lobes of the dx2−y2 and dz2 orbitals point directly at the ligands. For tetrahedral complexes, the d orbitals remain in place, but with only four ligands located between the axes. None of the orbitals points directly at the tetrahedral ligands. However, the dx2−y2 and dz2 orbitals (along the Cartesian axes) overlap with the ligands less than the dxy,...
42.4K
01:14Photoluminescence: Applications
389
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...
389
02:42Valence Bond Theory
8.5K
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...
8.5K
02:58Crystal Field Theory - Octahedral Complexes
26.4K
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...
26.4K
01:18Aromatic Hydrocarbon Cations: Structural Overview
2.8K
Cycloheptatriene is a neutral monocyclic unsaturated hydrocarbon that consists of an odd number of carbon atoms and an intervening sp3 carbon in the ring. The three double bonds in the ring correspond to 6 π electrons, which is a Huckel number, and therefore satisfies the criteria of 4n + 2 π electrons. However, the intervening sp3 carbon disrupts the continuous overlap of p orbitals. As a result, cycloheptatriene is not aromatic.
Removing one hydrogen from the intervening CH2 group...
Removing one hydrogen from the intervening CH2 group...
2.8K