巨大的晶体分子转子在固态中运行
Rempei Ando1, Ayana Sato-Tomita2, Hajime Ito3,1
1Division of Applied Chemistry, Graduate School of Engineering, and Frontier Chemistry Center (FCC), Department of Engineering, Hokkaido University, Sapporo, Hokkaido, 060-8628, Japan.
Angewandte Chemie (International ed. in English)
|August 31, 2023
概括
巨大的分子三和五呈现出固态旋转运动,打破了分子旋转器以前的尺寸记录. 这一发现扩大了在晶体环境中的分子动力学的可能性.
科学领域:
- 固态化学 固态化学
- 超分子化学 超分子化学
- 材料科学是一种材料科学.
背景情况:
- 固体中的分子运动通常由于密集包装而受到限制.
- 之前的研究集中在较小的分子作为固态旋转器.
- 三素是最大的已知分子,表现出固态旋转.
研究的目的:
- 为了证明和描述异常大分子的固态旋转运动:三烯和五烯.
- 为了研究分子大小对固态动力学的影响.
- 探索大型N-异环碳化合物 (NHC) Au(I) 复合物的潜力,作为分子旋转器的晶体介质.
主要方法:
- 合成和单晶X射线衍射与NHC Au (I) 复合体封装的三烯和五烯.
- 可变温度固态 (2H) 旋回回声核磁共振 (NMR) 光谱检测分子运动.
- 分析晶体结构以评估旋转子分子周围的自由体积.
主要成果:
- 带有13.0 Å的旋转直径的Pentiptycene超越了Triptycene (9.5 Å) 作为最大的报告的固态分子旋转器.
- 单晶X射线衍射证实了在晶体介质内足够的自由体积用于分子旋转.
- 固态2HNMR研究验证了三烯和五烯的旋转运动.
- 三烯显示出三倍旋转,而五烯显示出其旋转角度的温度依赖变化.
结论:
- 巨大的分子,如三烯和五烯可以经历显著的旋转运动在固体状态.
- 使用NHC Au(I) 复合体的封装策略提供了一种可行的方法,用于在大分子中实现固态分子旋转.
- 这项工作扩大了固态分子旋转器的尺寸限制,并为设计动态分子材料开辟了新的途径.
相关概念视频
Molecular and Ionic Solids
17.2K
Crystalline solids are divided into four types: molecular, ionic, metallic, and covalent network based on the type of constituent units and their interparticle interactions.
Molecular Solids
Molecular crystalline solids, such as ice, sucrose (table sugar), and iodine, are solids that are composed of neutral molecules as their constituent units. These molecules are held together by weak intermolecular forces such as London dispersion forces, dipole-dipole interactions, or hydrogen bonds, which...
Molecular Solids
Molecular crystalline solids, such as ice, sucrose (table sugar), and iodine, are solids that are composed of neutral molecules as their constituent units. These molecules are held together by weak intermolecular forces such as London dispersion forces, dipole-dipole interactions, or hydrogen bonds, which...
17.2K
Recrystallization: Solid–Solution Equilibria
1.1K
Recrystallization is a purification technique used to separate impurities from solid compounds. In this technique, no chemical reactions occur. Instead, it exploits physical properties only, specifically, the solubility differences between the desired compound and impurities, either at a single temperature or at different temperatures, and under other selected conditions. The solid-solution equilibrium (solubility equilibrium) of each component in the solution represents a binary phase...
1.1K
Structures of Solids
14.3K
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...
14.3K
Crystal Growth: Principles of Crystallization
2.1K
Crystallization is a phase transformation process in which crystals are precipitated from a supersaturated solution or formed from other sources. During crystallization, atoms or molecules arrange themselves into a well-defined, rigid crystal lattice to minimize energy.
Initiating crystallization involves manipulating the concentration of the solute and the temperature of the solution. Since crystal growth occurs when the ratio of concentration and solubility of the solute in the solvent...
Initiating crystallization involves manipulating the concentration of the solute and the temperature of the solution. Since crystal growth occurs when the ratio of concentration and solubility of the solute in the solvent...
2.1K


