トリフェニレンディスク分子HAT6の動態は,柱状および同位流体相における動態である
Fokko M Mulder1, John Stride, Stephen J Picken
1Interfaculty Reactor Institute, Delft University of Technology, Mekelweg 15, The Netherlands.
Journal of the American Chemical Society
|March 27, 2003
まとめ
分子ダイナミクスは,ディスク分子運動が強く相関し,電子や太陽光発電の材料における電荷伝送に影響を及ぼすことを明らかにします. これらのダイナミクスは,液体相でも持続します.
科学分野:
- 材料科学 材料科学とは
- 凝縮物質物理学 凝縮物質物理学
- 超分子化学 超分子化学
背景:
- ディスコティック分子は自己組織化して柱状の構造を形成し,分子電子や太陽光発電の潜在的応用がある"分子線"を形成します.
- これらの材料におけるアニゾトロプ的電荷移転は,分子核間のパイ軌道重複に依存する.
研究 の 目的:
- ディスコティック分子,特にヘキサキス (n-ヘキシロキシ) トリフェニレン (HAT6) のダイナミクスを調査し,分子構造との相関を調査する.
- 分子ダイナミクスが導電性物質に関連する電荷伝送特性にどのように影響するかを理解する.
主な方法:
- 結合準弾性中性子散射 (QENS) 測定と分子動力学シミュレーション.
- HAT6分子の中核と周辺アルキル尾の両方の動態を分析した.
主要な成果:
- ディスコティック分子の中核と尾のダイナミクスは強く相関し,分離していません.
- 観測された平面内運動 (0.2 ps) と平面外運動 (7 ps) は,ヴァン・デル・ワールスの相互作用によって支配されている.
- これらのダイナミクスは,コラム状と同otropic 液体相の両方で類似しており,相関は液体相で持続しています.
結論:
- ディスコ質の材料における分子運動は内在的に関連しており,電荷移転と同様の時間スケールで発生し,伝導性に直接影響する.
- 尾と尾の相互作用は,平面内と平面外の両方の動きに大きな影響を与えます.
- 観測されたダイナミクスと持続的な相関は,液体相でも秩序ある構造と電荷輸送の可能性を示唆しています.
関連する概念動画
Mechanisms of Membrane-bending
The living membranes are flexible due to their fluid mosaic nature; however, their bending into different shapes is an active process regulated by specific lipids and proteins. The membrane bending can be transient as seen in vesicles or stable for a long time as in microvilli. Cells regulate the size, location, and duration of the membrane curvature.
Membrane bending can happen due to intrinsic changes in lipid composition or extrinsic association with different proteins. The proteins involved...
Membrane bending can happen due to intrinsic changes in lipid composition or extrinsic association with different proteins. The proteins involved...
ATP Driven Pumps I: An Overview
ATP-driven pumps, also known as transport ATPases, are integral membrane proteins. They have binding sites for ATP located on the membrane's cytosolic side and the ion-conducting domain in the transmembrane region. These pumps use the free energy released from ATP hydrolysis to move the solutes across cell membranes against an electrochemical gradient.
There are four main types of ATP-driven pumps - P-type, V-type, F-type, and ABC transporter. All these pumps are of varying complexities and are...
There are four main types of ATP-driven pumps - P-type, V-type, F-type, and ABC transporter. All these pumps are of varying complexities and are...
Energy to Drive Translocation
Mitochondrial protein import is powered by two distinct energy sources: ATP hydrolysis and electrochemical potential across the inner membrane. Newly synthesized precursors are bound by cytosolic chaperones of the Hsp70 family, which guide them to the import receptors on the mitochondrial surface. Utilizing the energy of ATP hydrolysis, Hsp70 chaperones transfer these precursors to the TOM receptors on the mitochondrial outer membrane.
Generally, polypeptides are unfolded by two distinct...
Generally, polypeptides are unfolded by two distinct...
ATP Driven Pumps II: P-type Pumps
The P-type pumps are a large family of integral membrane transporter ATPases. They are divided into five major types based on substrate specificity, from I to V.
A typical P-type pump has three cytosolic domains: nucleotide-binding (N), phosphorylation (P), and activator (A) domains. These domains are connected to the membrane-spanning helices by short amino acid segments. ATP hydrolysis and covalent phosphoenzyme intermediate formation are crucial parts of the catalytic cycle. At the highly...
A typical P-type pump has three cytosolic domains: nucleotide-binding (N), phosphorylation (P), and activator (A) domains. These domains are connected to the membrane-spanning helices by short amino acid segments. ATP hydrolysis and covalent phosphoenzyme intermediate formation are crucial parts of the catalytic cycle. At the highly...
ATP Driven Pumps III: V-type Pumps
V-type pumps are ATP-driven pumps found in the vacuolar membranes of plants, yeast, endosomal and lysosomal membranes of animal cells, plasma membranes of a few specialized eukaryotic cells, and some prokaryotes. They are also known as the V1Vo-ATPase, that couple ATP hydrolysis to transport protons against a concentration gradient.
The peripheral or cytosolic V1 domain with eight subunits is involved in ATP hydrolysis. The integral or transmembrane V0 domain containing at least five subunits...
The peripheral or cytosolic V1 domain with eight subunits is involved in ATP hydrolysis. The integral or transmembrane V0 domain containing at least five subunits...


