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関連する概念動画

¹³C NMR: Distortionless Enhancement by Polarization Transfer (DEPT)01:20

¹³C NMR: Distortionless Enhancement by Polarization Transfer (DEPT)

When proton-coupled carbon-13 spectra are simplified by a broadband proton decoupling technique, structural information about the coupled protons is lost. Distortionless enhancement by polarization transfer (DEPT) is a technique that provides information on the number of hydrogens attached to each carbon in a molecule. While the DEPT experiment utilizes complex pulse sequences, the pulse delay and flip angle are specifically manipulated. The resulting signals have different phases depending on...
Thermal and Photochemical Electrocyclic Reactions: Overview01:26

Thermal and Photochemical Electrocyclic Reactions: Overview

Electrocyclic reactions are reversible reactions. They involve an intramolecular cyclization or ring-opening of a conjugated polyene. Shown below are two examples of electrocyclic reactions. In the first reaction, the formation of the cyclic product is favored. In contrast, in the second reaction, ring-opening is favored due to the high ring strain associated with cyclobutene formation.
Thermal Electrocyclic Reactions: Stereochemistry01:17

Thermal Electrocyclic Reactions: Stereochemistry

The stereochemistry of electrocyclic reactions is strongly influenced by the orbital symmetry of the polyene HOMO. Under thermal conditions, the reaction proceeds via the ground-state HOMO.
Selection Rules: Thermal Activation
Conjugated systems containing an even number of π-electron pairs undergo a conrotatory ring closure. For example, thermal electrocyclization of (2E,4E)-2,4-hexadiene, a conjugated diene containing two π-electron pairs, gives trans-3,4-dimethylcyclobutene.
Photochemical Electrocyclic Reactions: Stereochemistry01:26

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 Aldehydes and Ketones01:04

Structures of Aldehydes and Ketones

Vanillin—a flavoring agent in vanilla, cinnamaldehyde—a molecule responsible for the distinct smell of cinnamon, and acetone—a strong-smelling ingredient in nail polish removers, all belong to a class of carbonyl compounds called aldehydes and ketones (Figure 1). Although both aldehydes and ketones contain the characteristic carbonyl (C=O) bond, their chemical structures vary with respect to the groups directly attached to the carbonyl carbon.
In aldehydes (Figures 1a and 1b), the carbonyl...
The Electrical Double Layer01:30

The Electrical Double Layer

In the region where two bulk phases meet, an intricate electric charge distribution arises due to charge transfer, ion adsorption, molecular orientation, and charge distortion. This complex distribution is commonly referred to as the electrical double layer.When a solid electrode interfaces with ions in an electrolyte solution, the speed of electron transfer dictates the rates of oxidation and reduction. The electrode acquires a charge through the escape of atoms into the solution as cations or...

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関連する実験動画

Updated: Jul 21, 2026

Synthesis and Characterization of High c-axis ZnO Thin Film by Plasma Enhanced Chemical Vapor Deposition System and its UV Photodetector Application
08:18

Synthesis and Characterization of High c-axis ZnO Thin Film by Plasma Enhanced Chemical Vapor Deposition System and its UV Photodetector Application

Published on: October 3, 2015

歪んだ,Z形のペリレンビシミド.

Faysal Ilhan1, Daniel S Tyson, Daniel J Stasko

  • 1Polymers Branch, Materials and Structures Division, NASA Glenn Research Center, 21000 Brookpark Road, Cleveland, Ohio 44135, USA.

Journal of the American Chemical Society
|January 19, 2006
PubMed
まとめ

新しいZ形ペリレンビシミド染色体が合成され,特徴づけられました. この新しい分子は,エクシプレックス形成により強い光と固体状態の応用の可能性を示しています.

科学分野:

  • 有機化学 オーガニック・ケミストリー
  • マテリアルサイエンス 材料科学
  • フォトフィジックスの光学

背景:

  • ペリレンビシミドは,有機染料の重要なクラスである.
  • 適応特性を備えた新しい染色体の開発は,高度なアプリケーションにとって不可欠です.

研究 の 目的:

  • 新しいZ形ペリレンビシミド誘導体を合成するために.
  • その光物理学的および電気化学的性質を調査するために.
  • 固体状態のアプリケーションにおけるその可能性を探求する.

主な方法:

  • 光エノ化とダイエルス・アルダー反応による合成.
  • UV-Vis吸収と光スペクトロスコピーを用いて特徴づけました.
  • 電気化学分析とX線結晶学.

主要な成果:

  • N,N'-bis(オクチル) -3,9-bis(フェニル) ペリレン-1,2,7,8-テトラカルボキシルビシミド (1) の合成に成功しました.
  • ディクロロメタンのスペクトロスコピカルデータ:最大吸収度491 nm,最大光度517 nm,高量子収量 (0.70) と光寿命 (5.01 ns).
  • 固体赤色放射が観測され,エクシプレックス形成を示した;X線分析により,歪んだペリレン核が明らかになった.

さらに関連する動画

Effect of Bending on the Electrical Characteristics of Flexible Organic Single Crystal-based Field-effect Transistors
08:43

Effect of Bending on the Electrical Characteristics of Flexible Organic Single Crystal-based Field-effect Transistors

Published on: November 7, 2016

A Fabrication and Measurement Method for a Flexible Ferroelectric Element Based on Van Der Waals Heteroepitaxy
10:40

A Fabrication and Measurement Method for a Flexible Ferroelectric Element Based on Van Der Waals Heteroepitaxy

Published on: April 8, 2018

関連する実験動画

Last Updated: Jul 21, 2026

Synthesis and Characterization of High c-axis ZnO Thin Film by Plasma Enhanced Chemical Vapor Deposition System and its UV Photodetector Application
08:18

Synthesis and Characterization of High c-axis ZnO Thin Film by Plasma Enhanced Chemical Vapor Deposition System and its UV Photodetector Application

Published on: October 3, 2015

Effect of Bending on the Electrical Characteristics of Flexible Organic Single Crystal-based Field-effect Transistors
08:43

Effect of Bending on the Electrical Characteristics of Flexible Organic Single Crystal-based Field-effect Transistors

Published on: November 7, 2016

A Fabrication and Measurement Method for a Flexible Ferroelectric Element Based on Van Der Waals Heteroepitaxy
10:40

A Fabrication and Measurement Method for a Flexible Ferroelectric Element Based on Van Der Waals Heteroepitaxy

Published on: April 8, 2018

結論:

  • 新しいZ形ペリレンビシミドは,優れた光物理的性質を示しています.
  • 固体状態でのエクシプレックス形成は,光電子機器の可能性を示唆しています.
  • ねじれたコア構造は,観測された性質に影響します.