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相关概念视频

Stereoisomerism02:52

Stereoisomerism

11.8K
Isomerism in Complexes
Isomers are different chemical species that have the same chemical formula.
Transition metal complexes often exist as geometric isomers, in which the same atoms are connected through the same types of bonds but with differences in their orientation in space. Coordination complexes with two different ligands in the cis and trans positions from a ligand of interest form isomers. For example, the octahedral [Co(NH3)4Cl2]+ ion has two isomers (Figure 1) In the cis...
11.8K
Properties of Enantiomers and Optical Activity02:24

Properties of Enantiomers and Optical Activity

16.8K
It is essential to understand the difference between chiral and achiral interactions and the implications thereof in optical activity and their applications. Just as our feet, which are chiral, interact uniquely with chiral objects, such as a pair of shoes, but identically with achiral socks, enantiomers of a molecule exhibit different properties only when they interact with other chiral media. An example of a significant implication from this facet is the phenomenon known as optical activity,...
16.8K
Photochemical Electrocyclic Reactions: Stereochemistry01:26

Photochemical Electrocyclic Reactions: Stereochemistry

1.8K
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
1.8K
Thermal Sigmatropic Reactions: Overview01:16

Thermal Sigmatropic Reactions: Overview

2.1K
Sigmatropic rearrangements are a class of pericyclic reactions in which a σ bond migrates from one part of a π system to another. These are intramolecular rearrangements where the total number of σ and π bonds remain unchanged.
Sigmatropic shifts are classified based on an order term [i, j ], where i and j indicate the number of atoms across which each end of the σ bond migrates. Below are examples of a [3,3] sigmatropic shift in...
2.1K
Colors and Magnetism03:02

Colors and Magnetism

11.6K
Color in Coordination Complexes
When atoms or molecules absorb light at the proper frequency, their electrons are excited to higher-energy orbitals. For many main group atoms and molecules, the absorbed photons are in the ultraviolet range of the electromagnetic spectrum, which cannot be detected by the human eye. For coordination compounds, the energy difference between the d orbitals often allows photons in the visible range to be absorbed and emitted, which is seen as colors by the human...
11.6K
Aryldiazonium Salts to Azo Dyes: Diazo Coupling01:11

Aryldiazonium Salts to Azo Dyes: Diazo Coupling

2.9K
The reaction of weakly electrophilic aryldiazonium (also called arenediazonium) salts with highly activated aromatic compounds leads to the formation of products with an —N=N— link, called an azo linkage. This reaction, presented in Figure 1, is known as diazo coupling and occurs without the loss of the nitrogen atoms of the aryldiazonium salt. Highly activated aromatic compounds such as phenols or arylamines favor the diazo coupling reaction. The coupling generally occurs at the...
2.9K

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相关实验视频

Updated: Jun 11, 2025

Determination of the Photoisomerization Quantum Yield of a Hydrazone Photoswitch
09:33

Determination of the Photoisomerization Quantum Yield of a Hydrazone Photoswitch

Published on: February 7, 2022

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Ag2和Ag6集群之间的可逆互转及其响应光学特性

Huixin Xiang1,2, Yanze Wang2, Xinqi Xu3

  • 1Strait Laboratory of Flexible Electronics, Fujian Key Laboratory of Flexible Electronics, Strait Institute of Flexible Electronics, Fujian Normal University, Fuzhou 350117, China.

Journal of the American Chemical Society
|October 7, 2024
PubMed
概括
此摘要是机器生成的。

研究人员开发了新的白银集群 (Ag2和Ag6),可以通过溶剂可逆地改变结构. Ag2集群显示出卓越的X射线成像,可用于高级应用的敏感检测.

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Excitonic Hamiltonians for Calculating Optical Absorption Spectra and Optoelectronic Properties of Molecular Aggregates and Solids
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High-Contrast and Fast Photorheological Switching of a Twist-Bend Nematic Liquid Crystal
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相关实验视频

Last Updated: Jun 11, 2025

Determination of the Photoisomerization Quantum Yield of a Hydrazone Photoswitch
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Excitonic Hamiltonians for Calculating Optical Absorption Spectra and Optoelectronic Properties of Molecular Aggregates and Solids
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High-Contrast and Fast Photorheological Switching of a Twist-Bend Nematic Liquid Crystal
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科学领域:

  • 材料科学
  • 纳米技术
  • 化学学

背景情况:

  • 金属集群对于理解结构属性关系至关重要.
  • 外部刺激可以触发集群中的结构性相互转换.
  • 开发先进应用的新型集群是一个活跃的研究领域.

研究的目的:

  • 合成和描述新的银 (Ag2和Ag6).
  • 研究这些集群的依赖溶剂的可逆结构变化.
  • 评估它们在X射线成像应用中的潜力.

主要方法:

  • 银集群的合成 (Ag2和Ag6).
  • 使用质谱学,单晶X射线衍射,光发光和射线发光光谱学进行表征.
  • 柔性闪光灯膜的制造和测试

主要成果:

  • 由于溶剂的变化,Ag2和Ag6集群呈现可逆的结构变化.
  • 两个星团都表现出极好的光发光;Ag2具有优越的X射线光发光.
  • 基于Ag2的闪膜具有高空间分辨率 (15.0 lp/mm) 和低X射线检测极限 (0.58 μGy s-1).

结论:

  • 开发了一种新的方法,用于设计具有溶剂依赖性相互转换的无白银集群.
  • 这些发现为先进的X射线成像提供了新的洞察力.
  • Ag2星团显示出高性能X射线检测系统的巨大潜力.