相关实验视频

Updated: Jun 22, 2025

Qualitative Identification of Carboxylic Acids, Boronic Acids, and Amines Using Cruciform Fluorophores

Qualitative Identification of Carboxylic Acids, Boronic Acids, and Amines Using Cruciform Fluorophores

Published on: August 19, 2013

在亚[n]烯和[n]烯中,碳烯介导的光

Michal Šámal¹, Ludmilla Sturm², Marzena Banasiewicz³

¹Institute of Organic Chemistry and Biochemistry of the Czech Academy of Sciences 166 10 Prague 6 Czech Republic samal@uochb.cas.cz.

Chemical science

|June 28, 2024

概括

引入基基组到基因增强了它们的光学特性. 这种修改将吸收转移到可见光谱中,并增强光,克服了传统多环芳的局限性.

科学领域:

有机化学有机化学
光物理学的光学物理学
材料科学材料科学材料科学

背景情况:

烯是具有显著的手术性质的奇拉多环芳化合物.
传统的主要在紫外线区域吸收,并表现出微弱的发光.
这限制了它们在基于可见光的技术中的应用.

研究的目的:

为了研究外围的-碳基组装饰对烯光物理性质的影响.
为了增强可见光谱的吸收,并提高光量子产量.
探索新型乙[n]和[n]中的结构-性质关系.

主要方法:

亚[n]和[n]的合成和光谱化学表征.
使用时间依赖密度功能理论 (TD-DFT) 计算来进行电子结构分析.
评估吸收,发射和手术特性的变化.

主要成果:

周围的阿里尔碳烯装饰将烯的吸收转移到可见区域.
与母螺旋体相比,光量子产量得到了显著的改善.
在aceno[n]helicenones中增加螺旋长度会增加吸收开始和手术参数 (g_abs,g_lum).
在[n]中扩展芳香外围会导致吸收和排放的蓝色转移.

结论:

碳基可以有益地调节基的光学和光物理性质.
合成的烯和烯表明了需要可见光吸收和发射的应用的潜力.
定制基结构为调整它们的光电子特性提供了一个可行的策略.

更多相关视频

Microwave-assisted Intramolecular Dehydrogenative Diels-Alder Reactions for the Synthesis of Functionalized Naphthalenes/Solvatochromic Dyes

Microwave-assisted Intramolecular Dehydrogenative Diels-Alder Reactions for the Synthesis of Functionalized Naphthalenes/Solvatochromic Dyes

Published on: April 1, 2013

Preparation of a Corannulene-functionalized Hexahelicene by CopperI-catalyzed Alkyne-azide Cycloaddition of Nonplanar Polyaromatic Units

Preparation of a Corannulene-functionalized Hexahelicene by CopperI-catalyzed Alkyne-azide Cycloaddition of Nonplanar Polyaromatic Units

Published on: September 18, 2016

相关概念视频

IR and UV–Vis Spectroscopy of Carboxylic Acids

IR and UV–Vis Spectroscopy of Carboxylic Acids

In IR spectroscopy of carboxylic acids, the C=O bond shows a characteristic band between 1710 and 1760 cm⁻¹, and the O–H bond exhibits a broad band between 2500 and 3300 cm⁻¹.
However, the stretching absorptions for the C=O bond vary depending on the structure of carboxylic acids. The C=O bond of the free carboxylic acids shows a higher stretching frequency, 1760 cm−1, while H-bonded carboxylic acids (dimers) exhibit stretching absorptions at a lower frequency,...

Spectroscopy of Carboxylic Acid Derivatives

Spectroscopy of Carboxylic Acid Derivatives

Infrared spectroscopy is primarily used to determine the types of bonds and functional groups. In carboxylic acid derivatives, a typical carbonyl bond absorption is observed around 1650–1850 cm−1. For esters, the absorption is recorded at around 1740 cm−1, while acid halides show the absorption at about 1800 cm−1. Another acid derivative, the acid anhydrides, exhibit two carbonyl absorption around 1760 cm−1 and 1820 cm−1, arising from the symmetrical and...

Variables Affecting Phosphorescence and Fluorescence

Variables Affecting Phosphorescence and Fluorescence

Fluorescence and phosphorescence are essential phenomena in fields like analytical chemistry, biological imaging, and materials science, where they detect molecular properties and visualize cellular structures. Understanding the variables that influence these luminescent behaviors is crucial for maximizing accuracy and efficiency in their applications. These variables can broadly be grouped into chemical structure, solvent properties, and external conditions, each playing a distinct role in...

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

Structures of Carboxylic Acid Derivatives

Structures of Carboxylic Acid Derivatives

Structure of Carboxylic Acid Derivatives
Carboxylic acid derivatives contain an acyl group attached to a heteroatom such as chlorine, oxygen, or nitrogen. The carbonyl carbon and oxygen are both sp2-hybridized with an unhybridized p orbital.
The three sp2 orbitals of the carbonyl carbon form three σ bonds, one each with the carbonyl oxygen, the α carbon, and the heteroatom, whereas the other two sp2 orbitals of the carbonyl oxygen are occupied by the lone pairs. Further, the...

Aldehydes and Ketones with HCN: Cyanohydrin Formation Mechanism

Aldehydes and Ketones with HCN: Cyanohydrin Formation Mechanism

Cyanohydrins are formed when cyanide nucleophiles and carbonyl compounds like aldehydes and ketones react. A strong base, the cyanide ion, catalyzes cyanohydrin formation. The ions are generated from HCN under aqueous conditions. Once the cyanide ions are generated, the first step involves the nucleophilic attack of the cyanide ions on the electrophilic carbonyl carbon. This attack shifts the π electrons from the C=O to the oxygen atom forming the alkoxide ion intermediate. The alkoxide anion...