从体构建块构建晶体共价有机框架
Hai-Sen Xu1, San-Yuan Ding1, Wan-Kai An1
1State Key Laboratory of Applied Organic Chemistry, College of Chemistry and Chemical Engineering, Lanzhou University , Lanzhou, Gansu 730000, China.
Journal of the American Chemical Society
|September 2, 2016
概括
研究人员开发了一种简单的方法来创建性功能化共价有机框架 (COF). 这些新型多孔材料,LZU-72和LZU-76,表现出强度和高活性作为异质有机催化剂.
科学领域:
- 材料科学
- 有机化学
- 催化剂
背景情况:
- 共价有机框架 (COF) 是由有机单元构建的晶体多孔材料.
- 合成具有结晶性且具有理想性质的功能性COF仍然具有挑战性.
- 在非对称催化过程中,性COF特别有趣,但它们的结构很复杂.
研究的目的:
- 开发一种用于构建合功能化COF的简单策略.
- 使用特定的刚性支架合成和表征新型性COF.
- 评估合成的性COF作为异质器官催化剂的催化活性.
主要方法:
- 一个刚性脚手架的设计和合成,4,4'-(1H-[d]imidazole-4,7-diyl) dianiline (2).
- 合成一种性构成块, (S) -4,4'-(2-(pyrrolidin-2-yl) -1-H-benzo[d]imidazole-4,7-diyl) dianiline (3),其中包含一个性部分.
- 通过共价组合,利用性构建块构建两个性COF,LZU-72和LZU-76.
主要成果:
- 刚性脚手架和嵌入性pyrrolidine的建筑块的成功合成.
- 直接构建两个新奇的性COF,LZU-72和LZU-76,证明了结晶性和多孔性.
- 合成的性COF作为异质有机催化剂的结构强度和高催化活性的实验验证.
结论:
- 已经建立了一个直接构建合功能化COF的简单策略.
- 合成的性COF (LZU-72和LZU-76) 在结构上强大.
- 这些新性COF具有作为各种化学转换的高度活性异构器官催化剂的显著潜力.
相关概念视频
Crystal Field Theory - Tetrahedral and Square Planar Complexes
49.4K
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,...
49.4K
Prochirality
5.3K
The concept of prochirality leads to the nomenclature of the individual faces of a molecule and plays a crucial role in the enantioselective reaction. It is a concept where two or more achiral molecules react to produce chiral products. A typical process is the reaction of an achiral ketone to generate a chiral alcohol. Here, the achiral reactant reacts with an achiral reducing agent, sodium borohydride, to generate an equimolar mixture of the chiral enantiomers of the product. For example, an...
5.3K
Crystal Field Theory - Octahedral Complexes
31.5K
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...
31.5K
Molecules with Multiple Chiral Centers
16.2K
Molecules that possess multiple chiral centers can afford a large number of stereoisomers. For instance, while some molecules like 2-butanol have one chiral center, defined as a tetrahedral carbon atom with four different substituents attached, several molecules like butane-2,3-diol have multiple chiral centers. A simple formula to predict the number of stereoisomers possible for a molecule with n chiral centers is 2n. However, there can be a lower number where some of the stereoisomers are...
16.2K
Chirality
31.7K
Chirality is a term that describes the lack of mirror symmetry in an object. In other words, chiral objects cannot be superposed on their mirror images. For example, our feet are chiral, as the mirror image of the left foot, the right foot, cannot be superposed on the left foot.
Chiral objects exhibit a sense of handedness when they interact with another chiral object. For example, our left foot can only fit in the left shoe and not in the right shoe. Achiral objects — objects that have...
Chiral objects exhibit a sense of handedness when they interact with another chiral object. For example, our left foot can only fit in the left shoe and not in the right shoe. Achiral objects — objects that have...
31.7K
Polymer Classification: Crystallinity
4.2K
Unlike ionic or small covalent molecules, polymers do not form crystalline solids due to the diffusion limitations of their long-chain structures. However, polymers contain microscopic crystalline domains separated by amorphous domains.
Crystalline domains are the regions where polymer chains are aligned in an orderly manner and held together in proximity by intermolecular forces. For example, chains in the crystalline domains of polyethylene and nylon are bound together by van der Waals...
Crystalline domains are the regions where polymer chains are aligned in an orderly manner and held together in proximity by intermolecular forces. For example, chains in the crystalline domains of polyethylene and nylon are bound together by van der Waals...
4.2K


