相关实验视频

Updated: Jun 29, 2025

Synthesis of pH Dependent Pyrazole, Imidazole, and Isoindolone Dipyrrinone Fluorophores using a Claisen-Schmidt Condensation Approach

Synthesis of pH Dependent Pyrazole, Imidazole, and Isoindolone Dipyrrinone Fluorophores using a Claisen-Schmidt Condensation Approach

Published on: June 10, 2021

2-Aryl-3H-1,3-Benzazaphosphole氧化物:合成,光学特性,以及激发状态的分子内质子转移

Hiroaki Nakagomi¹, Nina Murayama¹, Rika Takegami²

¹Department of Fundamental Sciences, Graduate School of Science and Technology, Niigata University, Nishi-ku, Niigata, 950-2181, Japan.

Chemistry (Weinheim an der Bergstrasse, Germany)

|April 9, 2024

概括

将引入氧化物中调节了光学特性. 这项研究详细介绍了它们的合成,并展示了的结合如何导致红移排放,从而提高了它们在光学应用中的潜力.

科学领域:

有机化学有机化学
材料科学材料科学材料科学
光物理学的光学物理学

背景情况:

孔衍生物在光电子应用中至关重要.
异质原子的结合提供了一条调整它们光物理性质的途径.
扎氧化物代表了一类含的新型异环环.

研究的目的:

为了合成新型的2-aryl-3H-1,3-benzazaphosphole氧化物.
为了研究异原子包含对它们的光学性能的影响.
探索光物理行为,包括激发状态的分子内质子转移 (ESIPT).

主要方法:

连续的C-P交叉合反应.
脱水 [3+2] 循环添加用于环形成.
氧化反应形成扎氧化物.
紫外线-Vis吸收和光谱学.

主要成果:

一系列2-aryl-3H-1,3-benzazaphosphole氧化物的高效合成.
的加入导致了吸收和排放最大值的红色转移.
观察到的最低无人分子轨道 (LUMO) 水平的稳定.
一个衍生品表现出由于ESIPT从N-H tautomer的弱光.

结论:

原子在相框架中的战略性包含有效调节光学特性.
这些发现凸显了扎氧化物作为光学应用的可调节材料的潜力.
在一个特定的衍生品中观察到ESIPT现象,增加了对其光物理学的理解.

关键词:

亚扎孔是一种孔.染料/颜料的使用情况激发状态的分子内质子转移.光是一种光效应.

更多相关视频

Cercosporin-Photocatalyzed [4+1]- and [4+2]-Annulations of Azoalkenes Under Mild Conditions

Cercosporin-Photocatalyzed [4+1]- and [4+2]-Annulations of Azoalkenes Under Mild Conditions

Published on: July 17, 2020

[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

相关概念视频

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...

ortho–para-Directing Activators: –CH3, –OH, –&NoBreak;NH2, –OCH3

ortho–para-Directing Activators: –CH₃, –OH, –⁠NH₂, –OCH₃

All ortho–para directors, excluding halogens, are activating groups. These groups donate electrons to the ring, making the ring carbons electron-rich. Consequently, the reactivity of the aromatic ring towards electrophilic substitution increases. For instance, the nitration of anisole is about 10,000 times faster than the nitration of benzene. The electron-donating effect of the methoxy group in anisole activates the ortho and para positions on the ring and stabilizes the corresponding...

Electrophilic Aromatic Substitution: Fluorination and Iodination of Benzene

Electrophilic Aromatic Substitution: Fluorination and Iodination of Benzene

Bromination and chlorination of aromatic rings by electrophilic aromatic substitution reactions are easily achieved, but fluorination and iodination are difficult to achieve. Fluorine is so reactive that its reaction with benzene is difficult to control, resulting in poor yields of monofluoroaromatic products. To address this, Selectfluor reagent is used as a fluorine source in which a fluorine atom is bonded to a positively charged nitrogen.

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

Photoluminescence: Applications

Photoluminescence: Applications

Photoluminescence offers a wide range of applications due to its inherent sensitivity and selectivity. This technique allows for both direct and indirect analyses of the analyte. Direct quantitative analysis is possible when the analyte exhibits a favorable quantum yield for fluorescence or phosphorescence. However, an indirect analysis may be feasible if the analyte is not fluorescent or phosphorescent, or if the quantum yield is unfavorable. Indirect methods include reacting the analyte with...