聚合诱导的合性Zn (II) 复合体的增强光发射,由希夫基类型双甲基连接物协调
Daiki Tauchi1, Katsuya Kanno1, Masashi Hasegawa2
1Graduate School of Science and Engineering, Ibaraki University, 2-1-1 Bunkyo, Mito, Ibaraki 310-8512, Japan. hiroyuki.nishikawa.sci@vc.ibaraki.ac.jp.
Dalton transactions (Cambridge, England : 2003)
|April 30, 2024
概括
新型性 (II) 复合物R-/S-Zn,由于其刚性3D网络结构,表现出聚合诱导增强排放 (AIEE). 这些复合体还表现出循环二极化和循环极化发光,显示出在合材料科学中的潜力.
科学领域:
- 协调化学 协调化学
- 材料科学 材料科学 材料科学
- 奇拉化学 奇拉化学
背景情况:
- 从BINOL (1,1'-bi-2-naphthol) 衍生出的希夫基联体在构建金属复合物中具有价值.
- 奇拉金属复合物对于不对称催化和光电子学中的应用至关重要.
研究的目的:
- 通过使用BINOL衍生的希夫基联结物合成和表征新型性 ((II) 复合物.
- 研究合成复合物的固态结构,光物理性质和手术行为.
主要方法:
- 新型性Zn(II) 复合物的合成 (R-/S-Zn).
- 用于结构阐明的X射线晶体学.
- 光发光光谱学以确定光和聚合诱导增强辐射 (AIEE) 特性.
- 循环二极化 (CD) 和循环极化发光 (CPL) 谱学用于手术分析.
主要成果:
- 确定了两个不同的晶体结构:一个扭曲的三角形-双形和一个扭曲的四面体几何.
- 复合物在溶液和粉末中呈现光,粉末样本显示增强的排放 (AIEE).
- AIEE被归因于由CHπ和CHO相互作用形成的3D网络中的受限制分子运动.
- 观察到显著的CD和CPL信号,与10−310−4范围内的不对称系数.
结论:
- 合成的性Zn(II) 复合物具有独特的结构特征,并表现出AIEE特性.
- 在观察到的AIEE现象中,3D网络结构起着关键作用.
- 这些复合体由于其手术活性,显示出在合光电子设备中的应用潜力.
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
01:19Complexation Equilibria: The Chelate Effect
509
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...
509
03:02Colors and Magnetism
11.6K
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...
11.6K
02:52Stereoisomerism
11.9K
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...
11.9K
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
02:46Crystal 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