具有sql网络结构的2D板状Zn金属有机框架的光和催化性能
Chaewon Shin1, Jongseo Kim1, Seong Huh1
1Department of Chemistry and Protein Research Center for Bio-Industry, Hankuk University of Foreign Studies, Yongin 17035, Republic of Korea.
Molecules (Basel, Switzerland)
|September 9, 2023
概括
一个新的2D金属有机框架 (Zn-MOF) 被合成和表征. 这种无孔材料表现出易斯酸性位点,使 Ester 转化反应的催化成为可能.
科学领域:
- 材料化学 材料化学
- 协调化学 协调化学
- 催化剂是一种催化剂.
背景情况:
- 金属有机框架 (MOF) 为各种应用提供可调节的结构.
- 光链接器可以为MOF赋予独特的光物理性质.
- 了解结构属性关系对于MOF设计至关重要.
研究的目的:
- 通过光和二碳酸连接剂合成和表征一种新的2D片状Zn-MOF.
- 研究由此产生的Zn-MOF的结构,光物理和催化性能.
- 探索Zn-MOF在催化应用中的潜力.
主要方法:
- Zn-MOF的溶热合成.
- 单晶X射线衍射用于结构确定.
- 粉末X射线衍射用于相位纯度.
- 稳态光谱学. 稳态光谱学.
- 对转化反应的催化试验.
主要成果:
- 一个2D层状Zn-MOF,[Zn(μ-3-DPPy)(μ-BDC) ]n,具有sql拓的成功合成.
- 在Zn-MOF表现出扭曲的四面体协调几何围绕Zn (II) 离子.
- 该材料是无孔的,具有平行定向的烯部分.
- 光测量显示,与自由链接器相比,排放的蓝色移动.
- -MOF在的转化中表现出催化活性,这归因于表面的易斯酸性和缺陷部位.
结论:
- 合成的Zn-MOF具有独特的层状结构,具有有趣的光物理特性.
- 尽管它是无孔的,但材料表面的易斯酸性位点能够促进催化活性.
- 这项研究突出了具有特定结构特征的MOF在催化应用中的潜力.
相关概念视频
02:42Ionic Crystal Structures
14.4K
Ionic crystals consist of two or more different kinds of ions that usually have different sizes. The packing of these ions into a crystal structure is more complex than the packing of metal atoms that are the same size.
Most monatomic ions behave as charged spheres, and their attraction for ions of opposite charge is the same in every direction. Consequently, stable structures for ionic compounds result (1) when ions of one charge are surrounded by as many ions as possible of the opposite...
Most monatomic ions behave as charged spheres, and their attraction for ions of opposite charge is the same in every direction. Consequently, stable structures for ionic compounds result (1) when ions of one charge are surrounded by as many ions as possible of the opposite...
14.4K
02:58Crystal Field Theory - Octahedral Complexes
26.7K
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...
26.7K
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
02:37Metallic Solids
18.5K
Metallic solids such as crystals of copper, aluminum, and iron are formed by metal atoms. The structure of metallic crystals is often described as a uniform distribution of atomic nuclei within a “sea” of delocalized electrons. The atoms within such a metallic solid are held together by a unique force known as metallic bonding that gives rise to many useful and varied bulk properties.
All metallic solids exhibit high thermal and electrical conductivity, metallic luster, and malleability....
All metallic solids exhibit high thermal and electrical conductivity, metallic luster, and malleability....
18.5K
02:57Coordination Number and Geometry
15.9K
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.
15.9K
02:46Crystal Field Theory - Tetrahedral and Square Planar Complexes
42.8K
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,...
42.8K