在一个协调聚合物的家族中,通过分子聚合调整三重体激发途径
Rui Feng1, Zi-Ying Li1, Shi-Shuang Huang1
1School of Materials Science and Engineering & State Key Laboratory of Elemento-Organic Chemistry, Nankai University, Tianjin 300350, China.
Nano letters
|October 3, 2025
概括
研究人员开发了三种具有独特分子聚合结构的协调聚合物 (CP). 这些CP表现出可调节的光学特性,包括室温光 (RTP) 和光色学,通过分子堆叠控制激子通路.
科学领域:
- 材料科学 材料科学 材料科学
- 超分子化学 超分子化学
- 摄影化学的使用
背景情况:
- 分子聚合显著影响室温光 (RTP) 材料中的三重激子通路.
- 在RTP材料中控制各种聚合形式及其协同效应是一个持续的挑战.
研究的目的:
- 合成和表征具有受控聚合结构的协调聚合物 (CPs).
- 调查分子聚合,三重激子通路和光学特性 (光,光,光色) 之间的关系.
主要方法:
- 三种不同的协调聚合物 (CP) 的合成,具有不同的聚合模式:H-聚合,H-J聚合和H-X聚合.
- 单晶X射线衍射用于结构分析.
- 时间分辨率的辐射光谱学和理论计算,以研究激子的动态和电子性质.
主要成果:
- 三个CP,[Zn(3,4-PyDC) ((TPT) ]·TPT (1),[Zn(IPA) ((TPT) 2) ·H2O (2),和[Zn3(3,5-PyC) 2 ((TPT) 3 ((H2O) 2) ] (3),分别通过H,H-J和H-X聚合进行合成.
- 由于H-J聚合,CP 2表现出增强的电荷迁移,导致电荷分离的光色学.
- CP 3显示了来自H-X聚合的差异化轨道能量,使得波长响应的室温光.
结论:
- 分子聚合是调整三重激子通路和CP的光学特性的一个关键因素.
- 对聚合模式的控制操作为设计具有特定光物理行为的混合CP提供了可行的策略.
- 这项工作为设计具有指定的激子通路和定制光学反应的材料提供了一条途径.
更多相关视频
08:04Excitonic Hamiltonians for Calculating Optical Absorption Spectra and Optoelectronic Properties of Molecular Aggregates and Solids
Published on: May 27, 2020
8.9K
11:26Integrating a Triplet-triplet Annihilation Up-conversion System to Enhance Dye-sensitized Solar Cell Response to Sub-bandgap Light
Published on: September 12, 2014
13.1K
相关概念视频
02:42Valence Bond Theory
11.2K
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...
11.2K
01:58Cooperative Allosteric Transitions
8.6K
Cooperative allosteric transitions can occur in multimeric proteins, where each subunit of the protein has its own ligand-binding site. When a ligand binds to any of these subunits, it triggers a conformational change that affects the binding sites in the other subunits; this can change the affinity of the other sites for their respective ligands. The ability of the protein to change the shape of its binding site is attributed to the presence of a mix of flexible and stable segments in the...
8.6K
03:02Colors and Magnetism
13.9K
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...
13.9K
02:46Crystal Field Theory - Tetrahedral and Square Planar Complexes
48.1K
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,...
48.1K
01:26Photochemical Electrocyclic Reactions: Stereochemistry
2.2K
The absorption of UV–visible light by conjugated systems causes the promotion of an electron from the ground state to the excited state. Consequently, photochemical electrocyclic reactions proceed via the excited-state HOMO rather than the ground-state HOMO. Since the ground- and excited-state HOMOs have different symmetries, the stereochemical outcome of electrocyclic reactions depends on the mode of activation; i.e., thermal or photochemical.
Selection Rules: Photochemical Activation
Selection Rules: Photochemical Activation
2.2K
01:26Thermal and Photochemical Electrocyclic Reactions: Overview
2.9K
Electrocyclic reactions are reversible reactions. They involve an intramolecular cyclization or ring-opening of a conjugated polyene. Shown below are two examples of electrocyclic reactions. In the first reaction, the formation of the cyclic product is favored. In contrast, in the second reaction, ring-opening is favored due to the high ring strain associated with cyclobutene formation.
2.9K