探索铁电螺纹和状液晶中连接结构的影响
Hiroyuki Matsukizono1, Yusuke Sakamoto2, Yasushi Okumura1
1Kyushu University, Institute for Materials Chemistry and Engineering, 6-1 Kasuga-Koen, Kasuga, Fukuoka 816-8580, Japan.
The journal of physical chemistry letters
|April 10, 2024
概括
研究人员通过将二氧化单位替换为 Ester 来合成新的液晶类似物 (EST). 这些EST类型显示铁电相,为设计先进的液晶材料提供了新的途径.
科学领域:
- 材料科学 材料科学 材料科学
- 有机化学 有机化学
- 凝聚物质物理学 凝聚物质物理学
背景情况:
- 液晶分子3 - - 4 - 3 - 4 - 4 - 5 - 三 - - - - 2 - 二 - 4 - 5 - - 5 - n - - 1 - 3 - 二 - 2 - - 酸 (DIO) 以其铁电性阴性相和高介电常数而闻名.
- 扩展DIO系列对开发具有定制性质的新液晶材料具有兴趣.
研究的目的:
- 通过将1,3-二氧化单位替换为单位 (EST类似物) 来合成DIO的新型类似物.
- 描述这些EST类型的物理性质.
- 研究这些新材料中控制铁电相形成的结构性质关系.
主要方法:
- 合成新型含埃斯特的液晶类似物 (EST类似物).
- 物理性质的表征,包括相位行为和介电性质.
- 分析分子结构和二极点的分析,以了解铁电相出现.
主要成果:
- 通过成功合成EST类似物,并表现出与DIO类似物可比的铁电相.
- 一个特定的EST模拟器与脱的酸单元显示了铁电质A相,尽管纵向二极极矩较小.
- EST类似物在合成中提供了优势,避免了不必要的几何异构体,这对实际应用是有益的.
结论:
- 该研究表明,铁电相可以在液晶中出现,即使具有较小的纵向双极时刻,这也挑战了传统的理解.
- 没有几何异构体的EST类型的简单合成为其实际应用提供了显著的优势.
- 这些发现为合理设计具有铁电性质的新型液晶材料提供了宝贵的见解.
相关概念视频
02:22Structures of Solids
14.1K
Solids in which the atoms, ions, or molecules are arranged in a definite repeating pattern are known as crystalline solids. Metals and ionic compounds typically form ordered, crystalline solids. A crystalline solid has a precise melting temperature because each atom or molecule of the same type is held in place with the same forces or energy. Amorphous solids or non-crystalline solids (or, sometimes, glasses) which lack an ordered internal structure and are randomly arranged. Substances that...
14.1K
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
02:42Ionic 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
02:58Crystal Field Theory - Octahedral Complexes
26.4K
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...
26.4K
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
00:49Ligand Binding and Linkage
4.8K
Allosteric proteins have more than one ligand binding site; the binding of a ligand to any of these sites influences the binding of ligands to the other sites. When a protein is allosteric, its binding sites are called coupled or linked. In the case of enzymes, the site that binds to the substrate is known as the active site and the other site is known as the regulatory site. When a ligand binds to the regulatory site, this leads to conformational changes in the protein that can influence...
4.8K