相关实验视频

Updated: Aug 25, 2025

[DPEPhosbcpCu]PF6: A General and Broadly Applicable Copper-Based Photoredox Catalyst

[DPEPhosbcpCu]PF6: A General and Broadly Applicable Copper-Based Photoredox Catalyst

Published on: May 21, 2019

由SbF₆^-阳离子诱导的纳米集群转化,以促进光化学活动

Xiao Wei¹, Kenneth Chu², Jonathan Ralph Adsetts²

¹Department of Chemistry and Centre for Atomic Engineering of Advanced Materials, Key Laboratory of Structure and Functional Regulation of Hybrid Materials of Ministry of Education, Institutes of Physical Science and Information Technology and Anhui Province Key Laboratory of Chemistry for Inorganic/Organic Hybrid Functionalized Materials, Anhui University, Hefei, Anhui230601, China.

Journal of the American Chemical Society

|October 19, 2022

概括

控制六酸 (SbF₆^-) 离子的数量可以精确调整金属纳米集群结构和发光特性. 这项研究绘制了纳米集群的演变图,并揭示了SbF对光学特征的影响.

科学领域:

材料科学
纳米技术
物理化学

背景情况:

SbF₆-离子和金属纳米集群之间的相互作用对于定制纳米集群结构和特性至关重要.
在离子交换过程中对金属纳米集群的逐步定制进行监控仍然是一个重大挑战.

研究的目的:

研究SbF₆-对金属纳米集群的结构演变的影响.
探索改造的纳米集群的结构依赖光学特性,包括发光和电化学发光 (ECL).

主要方法:

对SbF₆-离子进行控制的引入,以诱导逐步的纳米集群转换.
对纳米集群演变的详细结构确定进行X射线晶体学.
分析光学吸收,光照和电化学发光 (ECL) 的光谱技术.

主要成果:

在SbF6结合后成功地绘制了Pt₁Ag_{28的序列结构演变,导致Pt₁Ag₃₀-SbF₆.}
与Pt₁Ag₃₀-SbF₆纳米集群相比,Pt₁-SbF₆具有超明亮的光 (85%的量子产量) 和更高的ECL效率.
这两种修改后的纳米集群在微分子度下表现出高绝对的ECL量子效率.

结论:

在原子层面重建和重新排列金属纳米集群中,SbF₆- counterions 起着至关重要的作用.
由SbF₆-引起的结构修改显著提高了发光特性,特别是ECL的效率.
这项工作为高级应用控制纳米集群结构和光学特性提供了基本的见解.

更多相关视频

Synthesis and Characterization of Supramolecular Colloids

Synthesis and Characterization of Supramolecular Colloids

Published on: April 22, 2016

Photogeneration of N-Heterocyclic Carbenes: Application in Photoinduced Ring-Opening Metathesis Polymerization

Photogeneration of N-Heterocyclic Carbenes: Application in Photoinduced Ring-Opening Metathesis Polymerization

Published on: November 29, 2018

相关概念视频

Cycloaddition Reactions: MO Requirements for Photochemical Activation

Cycloaddition Reactions: MO Requirements for Photochemical Activation

Some cycloaddition reactions are activated by heat, while others are initiated by light. For example, a [2 + 2] cycloaddition between two ethylene molecules occurs only in the presence of light. It is photochemically allowed but thermally forbidden.

Photochemical Electrocyclic Reactions: Stereochemistry

Photochemical Electrocyclic Reactions: Stereochemistry

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

Electrophilic Aromatic Substitution: Chlorination and Bromination of Benzene

Electrophilic Aromatic Substitution: Chlorination and Bromination of Benzene

Chlorination and bromination are important classes of electrophilic aromatic substitutions, where benzene reacts with chlorine or bromine in the presence of a Lewis acid catalyst to give halogenated substitution products. A Lewis acid such as aluminium chloride or ferric chloride catalyzes the chlorination, and ferric bromide catalyzes the bromination reactions. During the bromination of alkenes, bromine polarizes and becomes electrophilic. However, in the bromination of benzene, the bromine...

Electrophilic Aromatic Substitution: Sulfonation of Benzene

Electrophilic Aromatic Substitution: Sulfonation of Benzene

Sulfonation of benzene is a reaction wherein benzene is treated with fuming sulfuric acid at room temperature to produce benzenesulfonic acid. Fuming sulfuric acid is a mixture of sulfur trioxide and concentrated sulfuric acid.