縮小可能なフレームワークを備えた多孔な調整ポリマーのゲスト形状に反応するフィッティング
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
まとめ
毛細なコーディネーションポリマーは,ベンゼン吸収時に"形状に反応するフィッティング"変換を示し,最適の毛穴構造を作成するために収縮します. この発見は,柔軟なフレームワーク材料のための新しい設計原理を提供します.
科学分野:
- マテリアルサイエンス 材料科学
- クリスタログラフィーです.
- 超分子化学 超分子化学
背景:
- 毛細な調整ポリマー (PCP) は,調整可能な構造と毛穴の大きさを持つ結晶性材料です.
- PCP内のゲスト分子の相互作用を理解することは,選択的吸収材料の設計に不可欠です.
- ゲスト分子に対するPCPの柔軟性と構造的反応は,引き続き研究の対象となっている.
研究 の 目的:
- ゲスト分子の吸附時に毛細な調整ポリマーの構造変化を調査する.
- ベンゼンの吸収によって誘発される結晶変容のメカニズムを特徴づけるために,[Cu(2)(pzdc)(2)(bpy) ]G].
- 形状に反応する多孔質の材料を作成するための設計原理を確立する.
主な方法:
- 構造的変化を監視するために,インシット・シンクロトロンX線粉末 difraktion が採用されました.
- リートヴェルド分析は,アポホストとベンゼンに負荷された相の結晶構造を決定するために使用されました.
- ベンゼンのPCPフレームワークとの相互作用を研究するために,吸収実験が行われました.
主要な成果:
- ベンゼンの [[Cu(2)(pzdc)(2)(bpy) ]G]への吸収は,結晶構造の著しい収縮を誘導した (b軸: 6.8%,体積: 4.9%).
- ベンゼンによるチャネル占有にもかかわらず,フレームワークは新しい孔構造に変換されました.
- この現象は,孔がゲスト分子に適応する"形状反応性フィッティング"と呼ばれた.
結論:
- 毛細な調整ポリマーは,ゲスト分子に反応して,重要な構造変化を経験することができます.
- "形状に反応するフィッティング"メカニズムは,これらの材料のダイナミックな性質を強調します.
- 柔軟で硬いモチーフからなるフレームワークは,適切に結合され,適応性のある毛穴構造につながる可能性があります.
関連する概念動画
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,...