相关实验视频
Updated: Apr 14, 2026
08:52
Characterizing Electron Transport through Living Biofilms
Published on: June 1, 2018
9.0K
通过在自组装子中插入的芳香分子堆来纠正电子传输特性
Shintaro Fujii1, Tomofumi Tada2, Yuki Komoto1
1†Department of Chemistry, Graduate School of Science and Engineering, Tokyo Institute of Technology, 2-12-1 W4-10 Ookayama, Meguro-ku, Tokyo 152-8511, Japan.
Journal of the American Chemical Society
|April 23, 2015
概括
在分子中自组装的芳香堆提供可调节的电子功能. 研究人员用相同对实现了高导电性,用不同的对进行了整正,为新型分子电子学铺平了道路.
科学领域:
- 分子电子学分子电子学
- 超分子化学 超分子化学
- 纳米技术 纳米技术
背景情况:
- 芳香堆是分子电子学中的关键组件.
- 自组装为工程分子结构提供了一条路线.
- 对于可调节的电子功能,模块化组件是可取的.
研究的目的:
- 为了研究单分子芳香堆的电子运输特性.
- 探索具有模块化芳香对的自组装的电子功能.
- 了解这些系统中电子纠正背后的机制.
主要方法:
- 扫描探针显微镜扫描探针显微镜
- 断路结合技术 断路结合技术
- 理论计算 (例如,DFT) 的理论计算.
- 电流-电压 (I-V) 特性
- 行为测量行为测量.
主要成果:
- 在子中,相同的芳香对具有高导电性 (10^-3 - 10^-2 G0).
- 不同的芳香配对显示电子整正特性.
- 观察到1.4-2和>10的纠正比率.
- 校正与堆叠顺序和局部化分子轨道有关.
结论:
- 自组装提供了一个平台,用于模块化控制电子属性.
- 可调节的导电性和整正可以通过不同的芳香对来实现.
- 这些发现推动了分子电子设备的设计.
相关概念视频
01:18Aromatic Hydrocarbon Cations: Structural Overview
4.4K
Cycloheptatriene is a neutral monocyclic unsaturated hydrocarbon that consists of an odd number of carbon atoms and an intervening sp3 carbon in the ring. The three double bonds in the ring correspond to 6 π electrons, which is a Huckel number, and therefore satisfies the criteria of 4n + 2 π electrons. However, the intervening sp3 carbon disrupts the continuous overlap of p orbitals. As a result, cycloheptatriene is not aromatic.
Removing one hydrogen from the intervening CH2 group...
Removing one hydrogen from the intervening CH2 group...
4.4K
01:26Photochemical Electrocyclic Reactions: Stereochemistry
2.4K
The absorption of UV–visible light by conjugated systems causes the promotion of an electron from the ground state to the excited state. Consequently, photochemical electrocyclic reactions proceed via the excited-state HOMO rather than the ground-state HOMO. Since the ground- and excited-state HOMOs have different symmetries, the stereochemical outcome of electrocyclic reactions depends on the mode of activation; i.e., thermal or photochemical.
Selection Rules: Photochemical Activation
Selection Rules: Photochemical Activation
2.4K
01:41The Supercomplexes in the Crista Membrane
3.3K
The mitochondrial cristae membrane is the primary site for the oxidative phosphorylation (OXPHOS) process of energy conversion mediated through respiratory complexes I to V. These complexes have been widely studied for decades, and it has been proven that they form supramolecular structures called respiratory supercomplexes (SC). These higher-order complexes may be crucial in maintaining the biochemical structure and improving the physiological activity of the individual complexes while...
3.3K
01:28Electron Transport Chains
118.1K
The final stage of cellular respiration is oxidative phosphorylation that consists of two steps: the electron transport chain and chemiosmosis. The electron transport chain is a set of proteins found in the inner mitochondrial membrane in eukaryotic cells. Its primary function is to establish a proton gradient that can be used during chemiosmosis to produce ATP and generate electron carriers, such as NAD+ and FAD, that are used in glycolysis and the citric acid cycle.
The ETC is comprised of...
The ETC is comprised of...
118.1K
01:17Thermal Electrocyclic Reactions: Stereochemistry
2.7K
The stereochemistry of electrocyclic reactions is strongly influenced by the orbital symmetry of the polyene HOMO. Under thermal conditions, the reaction proceeds via the ground-state HOMO.
Selection Rules: Thermal Activation
Conjugated systems containing an even number of π-electron pairs undergo a conrotatory ring closure. For example, thermal electrocyclization of (2E,4E)-2,4-hexadiene, a conjugated diene containing two π-electron pairs, gives trans-3,4-dimethylcyclobutene.
Selection Rules: Thermal Activation
Conjugated systems containing an even number of π-electron pairs undergo a conrotatory ring closure. For example, thermal electrocyclization of (2E,4E)-2,4-hexadiene, a conjugated diene containing two π-electron pairs, gives trans-3,4-dimethylcyclobutene.
2.7K
01:14π Electron Effects on Chemical Shift: Aromatic and Antiaromatic Compounds
2.1K
In aromatic compounds, such as benzene, the circulation of (4n + 2) π-electrons sets up a diamagnetic or diatropic ring current around the perimeter of the molecule. This current induces a magnetic field that opposes the external field inside the ring and reinforces it on the outside. The protons in benzene are deshielded and exhibit high chemical shifts in the range 6.5–8.5 ppm. The shielding effect at the center of the ring is evident in complex aromatic molecules, such as...
2.1K