化学機能を利用した単一分子のストキャスティックスイッチングを媒介する.
Penelope A Lewis1, Christina E Inman, Yuxing Yao
1Department of Chemistry, The Pennsylvania State University, University Park, Pennsylvania 16802-6300, USA.
Journal of the American Chemical Society
|September 30, 2004
まとめ
アミドを含むモノレイヤーに挿入されたオリゴ (((フェニレン・エチニレン) 分子は,安定したオン/オフスイッチングを示します. この分子スイッチングは,マトリックス硬度に影響される水素結合のような環境要因によって制御されます.
科学分野:
- 分子電子 (モレキュラー・エレクトロニクス)
- 表面科学とは,地表科学である.
- 有機化学 オーガニック・ケミストリー
背景:
- 自己組み立てモノレイヤー (SAM) は,分子電子工学にとって極めて重要です.
- オリゴフェニレン-エチニレン (OPEs) は有望な分子スイッチです.
- アミドを含むアルカネチオールは,ユニークなマトリックス特性を有しています.
研究 の 目的:
- アミドを含むアルカネチオールSAMにおけるOPEスイッチングを調査する.
- 分子スイッチングに対する環境制御を実証する.
- スイッチング行動におけるマトリックス剛性の役割を理解する.
主な方法:
- OPEを挿入したアルカンエチオールSAMの製造.
- 導電性測定のためのスキャニングトンネル顕微鏡 (STM).
- バイアス依存のスイッチングと環境効果の分析.
主要な成果:
- OPEは安定したONとOFFのコンダクタンス状態を示した.
- バイアス依存のスイッチングが観察され,それは水素結合によって引き起こされた.
- マトリックス硬化に起因する,以前の研究と比較して,スイッチングイベントが少なかった.
結論:
- アミドを含むアルカネチオールSAMは,OPE分子スイッチのための安定したプラットフォームを提供します.
- 水素結合とマトリックス硬さは,分子スイッチングに大きな影響を与える.
- この研究は,反応性のある分子電子機器の設計を進める.
関連する概念動画
03:06Reaction Mechanisms
Chemical reactions often occur in a stepwise fashion, involving two or more distinct reactions taking place in a sequence. A balanced equation indicates the reacting species and the product species, but it reveals no details about how the reaction occurs at the molecular level. The reaction mechanism (or reaction path) provides details regarding the precise, step-by-step process by which a reaction occurs.
For instance, the decomposition of ozone appears to follow a mechanism with two steps:
For instance, the decomposition of ozone appears to follow a mechanism with two steps:
02:31Multi-Step Reactions
Chemical reactions often occur in a stepwise fashion involving two or more distinct reactions taking place in a sequence. A balanced equation indicates the reacting species and the product species, but it reveals no details about how the reaction occurs at the molecular level. The reaction mechanism (or reaction path) provides details regarding the precise, step-by-step process by which a reaction occurs. Each of the steps in a reaction mechanism is called an elementary reaction. These...
01:11Radical Reactivity: Overview
Radicals, the highly reactive species, gain stability by undergoing three different reactions. The first reaction involves a radical-radical coupling, in which a radical combines with another radical, forming a spin‐paired molecule. The second reaction is between a radical and a spin‐paired molecule, generating a new radical and a new spin‐paired molecule. The third reaction is radical decomposition in a unimolecular reaction, forming a new radical and a spin‐paired molecule. These three...
01:08Types of Chemical Reactions: Exchange and Reversible
An exchange reaction is a chemical reaction in which both synthesis and decomposition occur, chemical bonds are both formed and broken, and chemical energy is absorbed, stored, and released.
A special kind of exchange reaction is the oxidation-reduction reaction, or the redox reaction. These reactions involve the transfer of electrons from one compound to another. The electrons in these reactions commonly come from hydrogen atoms, which consist of an electron and a proton. A molecule gives up a...
A special kind of exchange reaction is the oxidation-reduction reaction, or the redox reaction. These reactions involve the transfer of electrons from one compound to another. The electrons in these reactions commonly come from hydrogen atoms, which consist of an electron and a proton. A molecule gives up a...
01:17Chemical Shift: Internal References and Solvent Effects
In an NMR sample, precise measurement of the absolute absorption frequencies of nuclei is difficult. A standard internal reference compound is added, and the frequency difference between the reference signal and sample signals is measured.
The internal reference compound generally used in NMR spectroscopy is tetramethylsilane (TMS). TMS is preferred because it is chemically inert, soluble in NMR solvents, and easily removable. Also, the highly shielded methyl protons in TMS yield an intense...
The internal reference compound generally used in NMR spectroscopy is tetramethylsilane (TMS). TMS is preferred because it is chemically inert, soluble in NMR solvents, and easily removable. Also, the highly shielded methyl protons in TMS yield an intense...
01:24A Single-Component System
In the field of chemistry, the terms "component" and "phase" hold significant importance. A component refers to a chemically distinct substance in a system that has specific properties. It is chemically homogeneous, meaning it has the same properties throughout. For example, in a mixture of salt and water, both salt and water are considered separate components because they have different chemical properties.On the other hand, a phase is a form of matter that has a consistent chemical...