客户适应多孔协调聚合物的客户形状,具有可缩小的框架
Ryotaro Matsuda1, Ryo Kitaura, Susumu Kitagawa
1Department of Synthetic Chemistry and Biological Chemistry, Kyoto University, Katsura, Nishikyo-ku, Kyoto 615-8510, Japan.
Journal of the American Chemical Society
|October 28, 2004
概括
多孔协调聚合物在吸附时表现出"形状响应适合"的转变,收缩以创建最佳孔隙结构. 这一发现为柔性框架材料提供了新的设计原则.
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.
- 超分子化学 超分子化学
背景情况:
- 多孔协调聚合物 (PCP) 是具有可调节结构和孔径的大小的晶体材料.
- 了解PCP内的客分子相互作用对于设计选择性吸附材料至关重要.
- PCP对客分子的灵活性和结构反应仍然是活跃的研究领域.
研究的目的:
- 为了研究客分子吸附后多孔协调聚合物的结构变化.
- 描述由在[Cu{2}{pzdc}{2}{bpy}}]G[中吸附诱导的晶体转化机制.
- 建立设计原则,以创建形状响应的多孔材料.
主要方法:
- 在现场同步射线X射线粉末衍射被用来监测结构变化.
- 瑞特维尔德分析被用来确定apohost和加载相的晶体结构.
- 进行了吸附实验,以研究与PCP框架的相互作用.
主要成果:
- 在[Cu(2)(pzdc)(2)(bpy) ]G]中的吸附引起了晶体结构的显著收缩 (b轴:6.8%,体积:4.9%).
- 尽管烯占据了通道,但框架经历了转变,变成了一个新的孔状结构.
- 这种现象被称为"形状响应适配",其中孔隙适应客分子.
结论:
- 多孔协调聚合物可以在响应客分子时经历显著的结构转变.
- "形状响应适配"机制突出了这些材料的动态性质.
- 由适当连接的柔性和刚性图案组成的框架可以导致适应性孔隙结构.
相关概念视频
02:34Polymers
The word polymer is derived from the Greek words “poly” which means “many” and “mer” which means “parts”. Polymers are long chains of molecules composed of repeating units of smaller molecules, known as monomers. They either occur naturally, such as DNA and proteins, or can be constructed synthetically, like plastics. They have varied structural characteristics, such as linear chains, branched chains, or complex networks, that contribute to the properties that they exhibit. Additionally,...
02:34Polymers
The word polymer is derived from the Greek words “poly” which means “many” and “mer” which means “parts”. Polymers are long chains of molecules composed of repeating units of smaller molecules, known as monomers. They either occur naturally, such as DNA and proteins, or can be constructed synthetically, like plastics. They have varied structural characteristics, such as linear chains, branched chains, or complex networks, that contribute to the properties that they exhibit. Additionally,...
01:21Polymer Classification: Crystallinity
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...
01:03Step-Growth Polymerization: Overview
Step-growth or condensation polymerization is a stepwise reaction of bi or multifunctional monomers to form long-chain polymers. As all the monomers are reactive, most of the monomers are consumed at the early stages of the reaction to form small chains of reactive oligomers, which then combine to form long polymer chains in the late stages. Hence, the reaction has to proceed for a long time to achieve high molecular weight polymers.
Many natural and synthetic polymers are produced by...
Many natural and synthetic polymers are produced by...
01:08Molecular Weight of Step-Growth Polymers
Step growth polymerization involves bi or multifunctional monomers. Bifunctional monomers react to form linear step growth polymers, whereas multifunctional monomers react to form non-linear or branched polymers.
As the step-growth polymerization involves step-wise condensation of monomers, the molecular weight also builds up eventually. Consequently, high molecular weight polymers are obtained at the late stages of the polymerization, where 99% of monomers have been consumed.
The extent of the...
As the step-growth polymerization involves step-wise condensation of monomers, the molecular weight also builds up eventually. Consequently, high molecular weight polymers are obtained at the late stages of the polymerization, where 99% of monomers have been consumed.
The extent of the...
02:34Polymers
The word polymer is derived from the Greek words “poly” which means “many” and “mer” which means “parts”. Polymers are long chains of molecules composed of repeating units of smaller molecules, known as monomers. They either occur naturally, such as DNA and proteins, or can be constructed synthetically, like plastics. They have varied structural characteristics, such as linear chains, branched chains, or complex networks, that contribute to the properties that they exhibit. Additionally,...