基于多个动态联系的晶体多孔有机框架.
Bo Liu1, Panyue Guo1, Xinyu Guan2,3
1College of Chemistry & Pharmacy, Northwest A&F University, Xian Yang Shi, Yangling, 712100, P. R. China.
Angewandte Chemie (International ed. in English)
|April 24, 2024
概括
研究人员使用动态链接开发了新的晶体多孔有机框架 (CPOF). 这些材料具有出色的可加工性和高氨容量,为气体吸附应用提供了有前途的解决方案.
科学领域:
- 材料科学 材料科学 材料科学
- 超分子化学 超分子化学
- 纳米技术 纳米技术
背景情况:
- 酸是用于创建复杂分子架构的多功能构建模块.
- 动态共价化学为刺激反应和自我愈合的材料提供了途径.
- 多孔有机框架 (POF) 由于其可调节的结构,对气体储存和分离具有吸引力.
研究的目的:
- 开发一种新型的晶体多孔有机框架 (CPOF),利用多层次的动态链接.
- 研究合成CPOF的结构完整性和解决方案可加工性.
- 为了评估CPOF的氨 (NH3) 吸附能力.
主要方法:
- 通过酸的现场凝结合成CPOF,形成由原始B←N键连接的B3O3单元.
- 超结构通过键和π-π相互作用的相互连接.
- 使用评估其结构,多孔性和化学性质的技术,对CPOF进行表征.
主要成果:
- 通过共价B-O,原始B←N和键,成功合成了新的CPOF.
- CPOFs表现出异常的解决方案可加工性,在溶解和再结晶后保持其结构.
- 通过使用具有成本效益的单体,实现了格拉姆尺度合成.
- 由于丰富的酸性位点,CPOF表现出高的NH3吸附能力,性能优于现有的多孔材料.
结论:
- 开发的CPOF代表了一类具有独特动态联系的功能性多孔材料.
- 它们的坚固而又可加工的性质使得它们适合各种应用.
- 高的NH3吸附能力凸显了它们在气体捕获和储存技术中的潜力.
相关概念视频
01:21Polymer Classification: Crystallinity
2.8K
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...
2.8K
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
01:10Radical Chain-Growth Polymerization: Overview
2.4K
Chain-growth or addition polymerization is successive addition reactions of monomers with a polymer chain. In radical chain-growth polymerization, the reaction proceeds via a free-radical intermediate. The free radical is formed from radical initiators, which spontaneously generate free radicals by homolytic fission. Organic peroxides (such as dibenzoyl peroxide, as shown in Figure 1) or azo compounds are popular radical initiators. A low concentration ratio of radical initiator to monomer is...
2.4K
02:18Network Covalent Solids
13.4K
Network covalent solids contain a three-dimensional network of covalently bonded atoms as found in the crystal structures of nonmetals like diamond, graphite, silicon, and some covalent compounds, such as silicon dioxide (sand) and silicon carbide (carborundum, the abrasive on sandpaper). Many minerals have networks of covalent bonds.
To break or to melt a covalent network solid, covalent bonds must be broken. Because covalent bonds are relatively strong, covalent network solids are typically...
To break or to melt a covalent network solid, covalent bonds must be broken. Because covalent bonds are relatively strong, covalent network solids are typically...
13.4K
01:09Radical Chain-Growth Polymerization: Mechanism
2.5K
The radical chain-growth polymerization mechanism consists of three steps: initiation, propagation, and termination of polymerization. The polymerization initiates when a free radical generated from the radical initiator adds to the unsaturated bond in the monomer. The unpaired electron of the free radical and one π electron in the unsaturated bond creates a σ bond between the free radical and the monomer. As a result, the other π electron in the unsaturated bond converts this...
2.5K