可逆和大规模的结构转化在可融的化物桥接协调聚合物晶体中
Yuudai Iwai1, Saaya Kimura1, Manabu Nakaya2
1Department of Chemistry, Faculty of Science, Kyushu University, 744 Motooka, Nishi-ku, Fukuoka, 819-0395, Japan.
Chemistry (Weinheim an der Bergstrasse, Germany)
|October 25, 2025
概括
研究人员合成了一种由3D和2D化物桥接协调聚合物 (CPs) 的新型化复合物. 这种突破性的材料具有低点,为动态固态材料提供了新的可能性.
科学领域:
- 材料科学 材料科学 材料科学
- 固态化学 固态化学
- 协调化学 协调化学
背景情况:
- 化物桥接协调聚合物 (CPs) 是功能性材料,但合成密集的3D金属化物框架,在分解之前化,是具有挑战性的.
- 聚合物的高点归因于强烈的金属化物相互作用,形成刚性结构.
研究的目的:
- 合成一种由3D和2D化物桥接协调聚合物组成的新型化复合物,没有体积大的有机组.
- 研究合成复合材料的结构性,热性和响应性.
主要方法:
- 脱水一个水合的前体K2Cd (H2O) Cu4 (CN) 8·1.5H2O形成一个复合物3D KCd (Cu) 2和2D K2Cu3 (CN) 5.
- 3D电子衍射 (MicroED) 用于共同存在的纳米领域的晶体结构确定.
- 差分扫描热度计 (DSC) 用于确定点.
主要成果:
- 成功合成了3D KCd[Cu(CN) 2) 3和2D K2Cu3 ((CN) 5) 的复合物.
- 这两种化合物的纳米域在单个粒子内被观察到,其结构由MicroED确定.
- 这两种化合物都呈现出559K左右的点,其中KCd[Cu(CN) 2 3显示出异常低的点,对于密集的3D框架来说.
- 在暴露于水蒸气时,证明了脱水复合物和水化前体之间的可逆转化.
结论:
- 合成的复合材料提供了一个稀有的化的3D/2D化物桥接协调聚合物的例子.
- 3D框架的低点归因于表面效应和动态Cu中心.
- 该材料表现出动态和响应性行为,突出了新型固态应用的潜力.
相关概念视频
01:21Polymer Classification: Crystallinity
3.7K
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...
3.7K
02:34Structural Isomerism
21.5K
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...
21.5K
02:37Metallic 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
00:57Cationic Chain-Growth Polymerization: Mechanism
2.8K
The cationic polymerization mechanism consists of three steps: initiation, propagation, and termination. In the initiation step of the polymerization process, the π bond of a monomer gets protonated by the Lewis acid catalyst, which is formed from boron trifluoride and water. The protonation of the π bond generates a carbocation stabilized by the electron‐donating group. In the propagation step, the π bond of the second monomer acts as a nucleophile and attacks the...
2.8K
02:52Stereoisomerism
13.9K
Isomerism in Complexes
Isomers are different chemical species that have the same chemical formula.
Transition metal complexes often exist as geometric isomers, in which the same atoms are connected through the same types of bonds but with differences in their orientation in space. Coordination complexes with two different ligands in the cis and trans positions from a ligand of interest form isomers. For example, the octahedral [Co(NH3)4Cl2]+ ion has two isomers (Figure 1) In the cis...
Isomers are different chemical species that have the same chemical formula.
Transition metal complexes often exist as geometric isomers, in which the same atoms are connected through the same types of bonds but with differences in their orientation in space. Coordination complexes with two different ligands in the cis and trans positions from a ligand of interest form isomers. For example, the octahedral [Co(NH3)4Cl2]+ ion has two isomers (Figure 1) In the cis...
13.9K
01:20Anionic Chain-Growth Polymerization: Overview
2.5K
The polymerization process that involves carbanion as an intermediate is called anionic polymerization. It is also a type of addition or chain-growth polymerization. Anionic polymerization gets initiated by a strong nucleophile such as an organolithium or a Grignard reagent. The most commonly used initiator for anionic polymerization is butyl lithium. Monomers involved in anionic polymerization must possess a vinyl group bonded to one or two electron-withdrawing groups. For instance,...
2.5K