毛細な分子導体: 線形協調ポリマー間の空間経路の電気化学的製造
Liyuan Qu1, Hiroaki Iguchi1, Shinya Takaishi1
1Department of Chemistry, Graduate School of Science , Tohoku University , 6-3 Aza-Aoba, Aramaki , Sendai 980-8578 , Japan.
Journal of the American Chemical Society
|April 19, 2019
まとめ
研究者らは電晶化を用いた 最初の多孔分子導体 (PMC) を開発した. この新しい材料は,溶媒を除去すると電気伝導性が向上し,反応性のある電子アプリケーションに希望を示しています.
科学分野:
- 材料科学
- 化学について
- 固体物理学
背景:
- 毛細な分子導体 (PMC) は,電子機器における潜在的な応用を持つ材料のクラスです.
- 調節可能な性質を持つ新しい PMC の開発は,分子電子学の進歩に不可欠です.
研究 の 目的:
- 最初の多孔分子導体を 合成し特徴づけること
- 新型PMCの電気伝導性と反応性を調査する.
主な方法:
- Cd2+とN,N'-di(4-ピリジル) -1,4,5,8-ナフタレンテトラカルボキシミド (NDI-py) の電気結晶化
- 一次元 (1D) 線形協調ポリマーの π-π スタッキングによる組立.
- NDIコアの部分的還元が,ラジカルアニオンになる.
主要な成果:
- 新しい PMC, [Cd(NDI-py) ((OH2) 4)) ((NO3) 1.3±0.1·nDMA (PMC-1) の合成が成功しました.
- 室温の電気伝導性は (1.0−3.3) × 10−3 S cm-1 となっています.
- 溶媒の分子を除去すると,電気伝導性が著しく向上することが示されました.
結論:
- PMC-1は,多孔性,空間間伝導性,そして豊富な電荷媒質を示す最初の材料です.
- PMCの電気伝導性は,溶媒の除去によって調節され,分子反応性を示します.
- PMCは次世代の分子反応性伝導材料の有望な候補です
関連する概念動画
01:01Polymers: Defining Molecular Weight
3.8K
Unlike small molecules with definite molecular weights, polymers are a mixture of individual polymer chains of varying lengths, each with a unique molecular weight. So, the molecular weight of a polymer is expressed as an average value based on the average size of the polymer chains. The two most common forms of averages used for polymers are the number average molecular weight and weight average molecular weight.
The number average molecular weight (Mn) is the summation of the number...
The number average molecular weight (Mn) is the summation of the number...
3.8K
01:10Polymers: Molecular Weight Distribution
4.7K
For any given polymer, the weight average molecular weight (Mw) is higher than, if not equal to, the number average molecular weight (Mn). The only situation in which the weight average molecular weight and the number average molecular weight are equal is when a polymer consists only of chains with equal molecular weight. However, this never happens in a synthetic polymer, since it is difficult to control the polymerization process up to a molecular level with accuracy to a hundred percent.
4.7K
02:57Coordination Number and Geometry
19.0K
For transition metal complexes, the coordination number determines the geometry around the central metal ion. Table 1 compares coordination numbers to molecular geometry. The most common structures of the complexes in coordination compounds are octahedral, tetrahedral, and square planar.
19.0K
02:34Polymers
40.6K
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...
40.6K
01:08Molecular Weight of Step-Growth Polymers
2.7K
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...
2.7K
01:26What is an Electrochemical Gradient?
127.5K
Adenosine triphosphate, or ATP, is considered the primary energy source in cells. However, energy can also be stored in the electrochemical gradient of an ion across the plasma membrane, which is determined by two factors: its chemical and electrical gradients.
The chemical gradient relies on differences in the abundance of a substance on the outside versus the inside of a cell and flows from areas of high to low ion concentration. In contrast, the electrical gradient revolves around an...
The chemical gradient relies on differences in the abundance of a substance on the outside versus the inside of a cell and flows from areas of high to low ion concentration. In contrast, the electrical gradient revolves around an...
127.5K