清除二维和三维聚酸盐酸盐结构中的差异
Robin N Dürr1,2, Pierfrancesco Maltoni3, Shihui Feng4
1Department of Chemistry, Physical Chemistry, Ångström Laboratory, Uppsala University, Uppsala 751 20 ,Sweden.
Inorganic chemistry
|January 19, 2024
概括
酸纳米棒和纳米片是不同的化合物,不仅仅是不同的形态. 这项研究澄清了它们独特的结构和组成,这对于理解电催化剂性能至关重要.
科学领域:
- 材料科学 材料科学 材料科学
- 催化剂是一种催化剂.
- 纳米技术 纳米技术
背景情况:
- 形态修饰是提高电催化剂性能的关键.
- 聚酸水合物以前已经被研究过,尽管有形态变异,但通常假定其组成是均的.
研究的目的:
- 要区分聚酸盐水合物纳米棒 (3D) 和纳米片 (2D).
- 阐明它们独特的晶体结构,化学成分和稳定性.
- 为电催化学中的结构性质关系研究提供明确的基础.
主要方法:
- 在X射线光电子光谱学 (XPS) 中.
- 离子束分析 离子束分析
- 热重力测量分析 (TGA)
- 在X射线衍射 (XRD) 中.
- 电子衍射的电子衍射方式
- 光谱技术 (红外线,拉曼) 的使用
- 磁性测量 磁性测量 磁性测量
- 一开始的分子动力学 (AIMD) 和密度函数理论 (DFT) 计算.
主要成果:
- 基酸纳米棒 (3D) 是NiMoO4·0.6H2O (三临床). 它们可以在任何情况下使用.
- 基酸盐纳米板 (2D) 是Ni3MoO5-0.5(OH) ·(2.3 - 0.5x) H2O,具有混合的Ni/Mo价值和多层结构.
- 实验和计算方法证实了结构,组成和稳定性的显著差异.
结论:
- 酸纳米棒和纳米片代表着从根本上不同的化学化合物.
- 准确的表征对于理解它们作为电催化剂或前体的作用至关重要.
- 这项工作完善了对聚酸水合物结构及其对催化作用的影响的理解.
相关概念视频
02:42Ionic Crystal Structures
14.3K
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...
14.3K
02:46Crystal Field Theory - Tetrahedral and Square Planar Complexes
42.6K
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,...
42.6K
02:42Valence Bond Theory
8.6K
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...
8.6K
02:34Structural Isomerism
19.2K
Isomerism in Complexes
Isomers are different chemical species that have the same chemical formula. Structural isomerism of coordination compounds can be divided into two subcategories, the linkage isomers and coordination-sphere isomers.
Linkage isomers occur when the coordination compound contains a ligand that can bind to the transition metal center through two different atoms. For example, the CN− ligand can bind through the carbon atom or through the nitrogen atom. Similarly, SCN− can...
Isomers are different chemical species that have the same chemical formula. Structural isomerism of coordination compounds can be divided into two subcategories, the linkage isomers and coordination-sphere isomers.
Linkage isomers occur when the coordination compound contains a ligand that can bind to the transition metal center through two different atoms. For example, the CN− ligand can bind through the carbon atom or through the nitrogen atom. Similarly, SCN− can...
19.2K
02:06Newman Projections
16.8K
Different notations are used to represent the three-dimensional structure of molecules on two-dimensional surfaces. One of the most commonly used representations is the dash-wedge formula. The dashed wedges, solid wedges, and the plane lines indicate the groups situated behind the plane, coming out of the plane, and in the plane, respectively.
The organic molecules rotate across the single bonds leading to numerous temporary three-dimensional structures of varying energy known as...
The organic molecules rotate across the single bonds leading to numerous temporary three-dimensional structures of varying energy known as...
16.8K
02:37Metallic Solids
18.4K
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....
18.4K