相关实验视频
Updated: May 29, 2026

10:37
Spatial Separation of Molecular Conformers and Clusters
Published on: January 9, 2014
集体诱导的量子受限的斯塔克效应在由两极重复单元组成的单层分子中
Ferdinand Rissner1, David A Egger, Amir Natan
1Institute of Solid State Physics, Graz University of Technology, 8010 Graz, Austria.
Journal of the American Chemical Society
|September 30, 2011
概括
在形成自组装单层 (SAM) 时,terpyrimidineethiol分子的电子结构发生显著变化. 带间隙缩小,电子状态极化,模仿半导体量子井中的量子受限斯塔克效应.
科学领域:
- * 材料科学 材料科学
- * 计算化学 计算机化学
- * 表面科学 表面科学
背景情况:
- * 对于设计新型电子材料来说,研究特皮里米丁乙醇的电子特性至关重要.
- * 了解从分子到单层电子行为的过渡是控制材料功能的关键.
研究的目的:
- *研究特皮里米丁乙醇在分离分子和自组装单层 (SAM) 中的电子结构.
- * 分析分子到SAM过渡期间电子性质的变化,例如带隙和状态局部化.
- * 探索分子二极体和计算方法对电子结构的影响.
主要方法:
- *使用密度函数理论 (DFT) 的计算.
- *对分离的特皮里米丁乙醇分子及其自组装单层进行了模拟.
- *使用混合函数来减轻计算中的自我交互错误.
主要成果:
- *在从分子过渡到SAM时,观察到带隙的大幅减少.
- * 边境电子状态位于SAM的相反侧面,呈现极化效应.
- * 由于分子二极体,在寡聚胺SAM中发现了与强电场相当的内在能量梯度.
结论:
- *可通过利用集体电子效应来调整terpyrimidineethiol SAMs的电子结构,而不仅仅是分子修改.
- *在SAM中观察到的两极化现象可以通过对半导体量子井中的量子受限斯塔克效应进行类比来理解.
- * 精心选择计算方法,如混合函数,对于准确描述这些系统的电子结构至关重要.
相关概念视频
π Electron Effects on Chemical Shift: Overview
An applied magnetic field causes loosely bound π-electrons in organic molecules to circulate, producing a local or induced diamagnetic field over a large spatial volume. As the molecules tumble in solution, the field generated by π-electrons in spherical substituents results in a zero net field. However, the net field generated by π-electrons in non-spherical substituents is not zero. The effect of this induced field depends on the orientation of the molecule with respect to B0, resulting in...
The Pauli Exclusion Principle
The arrangement of electrons in the orbitals of an atom is called its electron configuration. We describe an electron configuration with a symbol that contains three pieces of information:
Van der Waals Interactions
Atoms and molecules interact with each other through intermolecular forces. These electrostatic forces arise from attractive or repulsive interactions between particles with permanent, partial, or temporary charges. The intermolecular forces between neutral atoms and molecules are ion–dipole, dipole–dipole, and dispersion forces, collectively known as van der Waals forces.
VSEPR Theory and the Effect of Lone Pairs
Effect of Lone Pairs of Electrons on Molecule Geometry
Potential Due to a Polarized Object
A neutral atom consists of a positively charged nucleus surrounded by a negatively charged electron cloud. When placed in an external electric field, the external electric force pulls the electrons and nucleus apart, opposite to the intrinsic attraction between the nucleus and the electrons. The opposing forces balance each other with a slight shift between the center of masses of the nucleus and the electron cloud, resulting in a polarized atom. On the other hand, a few molecules, like water,...
Atomic Nuclei: Nuclear Spin State Overview
NMR-active nuclei have energy levels called 'spin states' that are associated with the orientations of their nuclear magnetic moments. In the absence of a magnetic field, the nuclear magnetic moments are randomly oriented, and the spin states are degenerate. When an external magnetic field is applied, the spin states have only 2 + 1 orientations available to them. A proton with = ½ has two available orientations. Similarly, for a quadrupolar nucleus with a nuclear spin value of one, the...

