单元对称性破坏和分层线性排序,使优越的短波紫外线双断晶体成为可能.
Xin Wen1, Dequan Kong2, Jingyao Lu2
1State Key Laboratory of Crystal Materials and Institute of Crystal Materials, Shandong University, Jinan, 250100, China.
Angewandte Chemie (International ed. in English)
|January 14, 2026
概括
使用一种新的设计策略,合成了具有较大的双折度的新晶体. 这些材料为短波紫外线应用提供增强的极化调制.
科学领域:
- 材料科学 材料科学 材料科学
- 晶体学 晶体学是指结晶学.
- 光学是什么?光学是什么?光学是什么?
背景情况:
- 短波紫外线 (200-280 nm) 晶体中较大的双折度对于极化调制至关重要,但仍然很少.
- 晶体光学异构性受到微观功能单元的空间布局的严重影响.
研究的目的:
- 提出一个设计概念,通过构建二维和线性晶体结构来实现大双折.
- 为光学应用合成具有增强双断度的新型晶体.
主要方法:
- 采用了破坏对称性的策略,将三角 π 结合组扩展到具有较大的异性极化功能的组,包括酸盐 [NO2]-,碳酸盐 [COOH]-,甲基瓜尼迪尼 [C2N3H8]+和氨酸 [C2N4H7O]+.
- 两个晶体,[C2N3H8]NO2和[C2N4H7O]COOH,通过键合成,以实现理想的线性排序.
主要成果:
- 合成的晶体[C2N3H8]NO2和[C2N4H7O]COOH,在546nm时分别呈现出0.331和0.413的显著增强的双折度值.
- [C2N4H7O]COOH在短波紫外线区域展示了宽带间隙和优异的双折射的罕见组合.
- 成功地获得了合成材料的厘米大小的单晶.
结论:
- 构建线性排列结构的拟议设计概念有效地增强了晶体中的双断.
- 合成的[C2N3H8]NO2和[C2N4H7O]COOH晶体是短波紫外线范围内极化状态调节的有希望的候选材料.
- 这项研究为设计高双断晶体提供了新的策略.
更多相关视频
06:24High-Contrast and Fast Photorheological Switching of a Twist-Bend Nematic Liquid Crystal
Published on: October 31, 2019
6.8K
10:35Using Microwave and Macroscopic Samples of Dielectric Solids to Study the Photonic Properties of Disordered Photonic Bandgap Materials
Published on: September 26, 2014
12.7K
相关概念视频
Ionic Crystal Structures
16.8K
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...
16.8K
Structures of Solids
17.4K
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...
17.4K
Metallic Solids
20.5K
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....
20.5K
X-ray Crystallography
25.7K
The size of the unit cell and the arrangement of atoms in a crystal may be determined from measurements of the diffraction of X-rays by the crystal, termed X-ray crystallography.
Diffraction
Diffraction is the change in the direction of travel experienced by an electromagnetic wave when it encounters a physical barrier whose dimensions are comparable to those of the wavelength of the light. X-rays are electromagnetic radiation with wavelengths about as long as the distance between neighboring...
Diffraction
Diffraction is the change in the direction of travel experienced by an electromagnetic wave when it encounters a physical barrier whose dimensions are comparable to those of the wavelength of the light. X-rays are electromagnetic radiation with wavelengths about as long as the distance between neighboring...
25.7K
Lattice Centering and Coordination Number
11.4K
The structure of a crystalline solid, whether a metal or not, is best described by considering its simplest repeating unit, which is referred to as its unit cell. The unit cell consists of lattice points that represent the locations of atoms or ions. The entire structure then consists of this unit cell repeating in three dimensions. The three different types of unit cells present in the cubic lattice are illustrated in Figure 1.
Types of Unit Cells
Imagine taking a large number of identical...
Types of Unit Cells
Imagine taking a large number of identical...
11.4K
Crystal Field Theory - Tetrahedral and Square Planar Complexes
48.1K
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,...
48.1K
