循环金属化发光 (((II) 不对称的2.2':4',2''-二和其自组合的二次体的复合体,呈现Pt-Ag的性键
Lorien Benda1, Louise Miton1, Nihal Hadj Seyd1
1Sorbonne Université, UMR CNRS 8232, Institut Parisien de Chimie Moléculaire, 4 place Jussieu, 75005, Paris, France. guillaume.vives@sorbonne-universite.fr.
Dalton transactions (Cambridge, England : 2003)
|June 19, 2024
概括
(II) 复合物与特皮里丁连接物自组合成由白银 (I) 和-白银相互作用稳定的状二元体. 这些复合体表现出强烈的发光,其排放特性由其固态结构来解释.
科学领域:
- 协调化学 协调化学
- 超分子化学 超分子化学
- 光物理学的光学物理学
背景情况:
- 循环金属 ((II) 复合物与特皮里丁配体以其独特的结构和光物理性质而闻名.
- 在 terpyridine 连接体中加入一个非协调原子,为新的协调模式和自我组装提供了机会.
研究的目的:
- 为了合成和表征新型的循环金属 ((II) 复合物,其中包括特皮里丁配体.
- 调查这些复合体在存在银(I) 离子时的自我组装行为.
- 探索发光性质及其与分子结构的关系.
主要方法:
- 合成循环金属 ((II) 复合物.
- 为了固态结构的确定,使用X射线晶体学.
- 光谱技术 (UV-Vis吸收,辐射光谱) 用于研究光物理性质.
- 核磁共振光谱用于溶液状态的表征.
主要成果:
- 成功合成了带有 Pt-C 键和含有非协调原子的 terpyridine 连接体的 (II) 复合体.
- 观察自组装的状二元体,由一个 bis ((isonitrile) Pt ((II) 复合物在 Ag ((I)) 存在下形成.
- 通过Ag(I) 协调和金属性Pt-Ag相互作用稳定二聚体,在固体和溶液状态下保持稳定.
- 所有合成的复合体都显示出强烈的发光,具有多个发射状态.
结论:
- 该研究表明,由银稳定复杂的自组合状二元体的形成.
- 观察到的发光和多重发射状态与特定的协调环境和固态结构直接相关.
- 这些发现为设计基于自组装复合物的先进发光材料开辟了道路.
相关概念视频
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
02:51Metal-Ligand Bonds
20.7K
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...
20.7K
02:57Coordination Number and Geometry
15.7K
For transition metal complexes, the coordination number determines the geometry around the central metal ion. Table 1 compares coordination numbers to molecular geometry. The most common structures of the complexes in coordination compounds are octahedral, tetrahedral, and square planar.
15.7K
00:43Complexometric Titration: Ligands
944
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...
944
01:19Complexation Equilibria: The Chelate Effect
498
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...
498
02:46Crystal Field Theory - Tetrahedral and Square Planar Complexes
42.0K
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,...
42.0K