グラフェンのノンコヴァレンント機能化のための多価結合モチーフ
Jason A Mann1, Joaquín Rodríguez-López, Héctor D Abruña
1Department of Chemistry and Chemical Biology, Cornell University, Baker Laboratory, Ithaca, New York 14853-1301, United States.
Journal of the American Chemical Society
|October 13, 2011
まとめ
研究者は,強力なグラフェン結合のための新しい三足の分子を開発しました. この新しい材料は,安定したモノレイヤーを形成し,グラフェン表面から機能性を投影することで,電気化学アプリケーションを強化します.
科学分野:
- マテリアルサイエンス 材料科学
- 電気化学 電気化学について
- 表面化学について
背景:
- グラフェンは,電気活性化合物との接点に理想的な導電性材料です.
- 芳香基は通常,ヴァン・デル・ワールス力によってグラフェンと相互作用し,分子に平らな状態をもたらします.
- 既存の方法では,グラフェン表面から機能群の方向と投影を制御できない.
研究 の 目的:
- グラフェンに強固かつ指向的に結合するための三足の分子を設計し,特徴づけること.
- 電気化学的方法を用いて,この分子の結合熱力学と運動学を調査する.
- グラフェン改変された表面の安定性と電子伝送特性を評価する.
主な方法:
- ピレン部分とリドックス活性コバルト複合体の三足分子の合成.
- 単層グラフェンへの結合パラメータ (熱力学と運動学) の電気化学的調査.
- 分子フットプリントと単層の安定性を決定するための表面特性.
- 単一の芳香結合群を持つモデル化合物との比較.
主要な成果:
- 三脚の分子はグラフェンと強い結合を示している (ΔGads = -38.8 ± 0.2 kJ mol−1).
- 2.3nm2の分子足跡を持つ安定した単層が形成されました.
- モノレイヤーは高い安定性 (>12時間) と,モデル化合物と比較して著しく遅い脱吸収率を示した.
- 電子移転速度は,再酸化活性成分がグラフェン表面から遠ざかっていることを示唆しています.
結論:
- 三脚のモチーフは,機能的な分子がグラフェンに強く,指向的に吸収することを可能にします.
- このアプローチは,電気化学アプリケーションの強化された安定性と制御された表面機能を提供します.
- 設計された分子は,高度なグラフェンベースのインターフェースの開発のための多用途のプラットフォームを提供します.
関連する概念動画
Noncovalent Attractions in Biomolecules
Noncovalent attractions are associations within and between molecules that influence the shape and structural stability of complexes. These interactions differ from covalent bonding in that they do not involve sharing of electrons.
Four types of noncovalent interactions are hydrogen bonds, van der Waals forces, ionic bonds, and hydrophobic interactions.
Hydrogen bonding results from the electrostatic attraction of a hydrogen atom covalently bonded to a strong-electronegative atom like oxygen,...
Four types of noncovalent interactions are hydrogen bonds, van der Waals forces, ionic bonds, and hydrophobic interactions.
Hydrogen bonding results from the electrostatic attraction of a hydrogen atom covalently bonded to a strong-electronegative atom like oxygen,...
Noncovalent Attractions in Biomolecules
Noncovalent attractions are associations within and between molecules that influence the shape and structural stability of complexes. These interactions differ from covalent bonding in that they do not involve sharing of electrons.
Four types of noncovalent interactions are hydrogen bonds, van der Waals forces, ionic bonds, and hydrophobic interactions.
Hydrogen bonding results from the electrostatic attraction of a hydrogen atom covalently bonded to a strong-electronegative atom like oxygen,...
Four types of noncovalent interactions are hydrogen bonds, van der Waals forces, ionic bonds, and hydrophobic interactions.
Hydrogen bonding results from the electrostatic attraction of a hydrogen atom covalently bonded to a strong-electronegative atom like oxygen,...
Ligand Binding and Linkage
Allosteric proteins have more than one ligand binding site; the binding of a ligand to any of these sites influences the binding of ligands to the other sites. When a protein is allosteric, its binding sites are called coupled or linked. In the case of enzymes, the site that binds to the substrate is known as the active site and the other site is known as the regulatory site. When a ligand binds to the regulatory site, this leads to conformational changes in the protein that can influence the...
Metal-Ligand Bonds
The hemoglobin in the blood, the chlorophyll in green plants, vitamin B-12, and the catalyst used in the manufacture of polyethylene all contain coordination compounds. Ions of the metals, especially the transition metals, are likely to form complexes.
In these complexes, transition metals form coordinate covalent bonds, a kind of Lewis acid-base interaction in which both of the electrons in the bond are contributed by a donor (Lewis base) to an electron acceptor (Lewis acid). The Lewis acid in...
In these complexes, transition metals form coordinate covalent bonds, a kind of Lewis acid-base interaction in which both of the electrons in the bond are contributed by a donor (Lewis base) to an electron acceptor (Lewis acid). The Lewis acid in...
Valence Bond Theory
Coordination compounds and complexes exhibit different colors, geometries, and magnetic behavior, depending on the metal atom/ion and ligands from which they are composed. In an attempt to explain the bonding and structure of coordination complexes, Linus Pauling proposed the valence bond theory, or VBT, using the concepts of hybridization and the overlapping of the atomic orbitals. According to VBT, the central metal atom or ion (Lewis acid) hybridizes to provide empty orbitals of suitable...
Cooperative Binding of Transcription Regulators
Transcriptional regulators bind to specific cis-regulatory sequences in the DNA to regulate gene transcription. These cis-regulatory sequences are very short, usually less than ten nucleotide pairs in length. The short length means that there is a high probability of the exact same sequence randomly occurring throughout the genome. Since regulators can also bind to groups of similar sequences, this further increases the chances of random binding. Transcriptional regulators form dimers that...


