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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...
NMR Spectroscopy of Benzene Derivatives01:37

NMR Spectroscopy of Benzene Derivatives

Simple unsubstituted benzene has six aromatic protons, all chemically equivalent. Therefore, benzene exhibits only a singlet peak at δ 7.3 ppm in the 1H NMR spectrum. The observed shift is far downfield because the aromatic ring current strongly deshields the protons. Any substitution on the benzene ring makes the aromatic protons nonequivalent, and the protons split each other. The peak is, therefore, no longer a singlet and the splitting pattern and their associated coupling constants depend...
¹H NMR Signal Integration: Overview00:58

¹H NMR Signal Integration: Overview

The intensity of a signal, which can be represented by the area under the peak, depends on the number of protons contributing to that signal. The area under each peak is shown as a vertical line called an integral, with the integral value listed under it, as seen in the proton NMR spectrum of benzyl acetate. Each integral value is divided by the smallest integral value to obtain the ratio of the number of protons producing each signal. The ratio reveals the relative number of protons and not...
Spin–Spin Coupling Constant: Overview01:08

Spin–Spin Coupling Constant: Overview

In bromoethane, the three methyl protons are coupled to the two methylene protons that are three bonds away. In accordance with the n+1 rule, the signal from the methyl protons is split into three peaks with 1:2:1 relative intensities. The methylene protons appear as a quartet, with the relative intensities of 1:3:3:1.
Qualitatively, any spin plus-half nucleus polarizes the spins of its electrons to the minus-half state. Consequently, the paired electron in the hydrogen–carbon bond must have a...
¹³C NMR: ¹H–¹³C Decoupling01:04

¹³C NMR: ¹H–¹³C Decoupling

The probability of having two carbon-13 atoms next to each other is negligible because of the low natural abundance of carbon-13. Consequently, peak splitting due to carbon-carbon spin-spin coupling is not observed in spectra. However, protons up to three sigma bonds away split the carbon signal according to the n+1 rule, resulting in complicated spectra.
A broadband decoupling technique is used to simplify these complex, sometimes overlapping, signals. Broadband decoupling relies on a...
Double Resonance Techniques: Overview01:12

Double Resonance Techniques: Overview

Double resonance techniques in Nuclear Magnetic Resonance (NMR) spectroscopy involve the simultaneous application of two different frequencies or radiofrequency pulses to manipulate and observe two distinct nuclear spins. One important application of double resonance is spin decoupling, which selectively suppresses coupling with one type of nucleus while observing the NMR signal from another nucleus, simplifying the spectrum and enhancing resolution.
Spin decoupling is usually achieved by...

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関連する実験動画

Updated: Jul 12, 2026

Quasi-light Storage for Optical Data Packets
07:45

Quasi-light Storage for Optical Data Packets

Published on: February 6, 2014

完全光学信号処理用の3次元の非線形性が大きいビスダイオキサボリンポリメチンは,全光学信号処理用の3次元の非線形性が大きい.

Joel M Hales1, Shijun Zheng, Stephen Barlow

  • 1School of Chemistry and Biochemistry and Center for Organic Photonics and Electronics, Georgia Institute of Technology, Atlanta, Georgia 30332-0400, USA.

Journal of the American Chemical Society
|August 31, 2006
PubMed
まとめ

新しいポリメチンの染料は,全光学信号処理の重要な進歩を提供します. これらの有機物質は,巨大で超高速な3次元の非線形性と,光子装置にとって極めて重要な近赤外線の低損失を示します.

さらに関連する動画

Qualitative Identification of Carboxylic Acids, Boronic Acids, and Amines Using Cruciform Fluorophores
09:46

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

Published on: August 19, 2013

Synthesis of Triazole and Tetrazole-Functionalized Zr-Based Metal-Organic Frameworks Through Post-Synthetic Ligand Exchange
04:51

Synthesis of Triazole and Tetrazole-Functionalized Zr-Based Metal-Organic Frameworks Through Post-Synthetic Ligand Exchange

Published on: June 23, 2023

関連する実験動画

Last Updated: Jul 12, 2026

Quasi-light Storage for Optical Data Packets
07:45

Quasi-light Storage for Optical Data Packets

Published on: February 6, 2014

Qualitative Identification of Carboxylic Acids, Boronic Acids, and Amines Using Cruciform Fluorophores
09:46

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

Published on: August 19, 2013

Synthesis of Triazole and Tetrazole-Functionalized Zr-Based Metal-Organic Frameworks Through Post-Synthetic Ligand Exchange
04:51

Synthesis of Triazole and Tetrazole-Functionalized Zr-Based Metal-Organic Frameworks Through Post-Synthetic Ligand Exchange

Published on: June 23, 2023

科学分野:

  • 有機的な非線形光学です.
  • フォトニクスのための材料科学
  • 全光学信号処理装置です.

背景:

  • 大量の第三次非線形性を有する有機物質は,全光学信号処理に不可欠である.
  • 近赤外線スペクトルレジムは,光子装置の開発に極めて重要です.

研究 の 目的:

  • 強化された第3位の非線形光学特性を有する新しいポリメチン材料を開発する.
  • 近赤外線アプリケーションのためのビスディオキシサボリン末端ポリメチンの染料を調査する.

主な方法:

  • 拡張されたビスダイオキサボリンポリメチンアニオンの合成と特徴付け.
  • 1.3μmの三次微小非線形性 (ガンマ) の測定
  • 整ったフィルムの線形および非線形光学特性の評価,第三次マクロスコピック非線形性 (chi ((3)) と時間応答を含む.

主要な成果:

  • 拡張されたビスオキシサボリンポリメチンアニオンは,対称性の破損なしに1.3μmで大きな3次元の顕微鏡の非線形性を示した (ささガマダバ = 5.7 x 10^-32 esu).
  • 清潔なフィルムは,低い線形損失と重要な3次元のマクロスコーピカル非線形性を示した (laychi (((3) laychi = 3.6 x 10^-10 esu) で,応答時間は<8 ps.
  • chi ((3) の実際の部分は,想像上の構成要素よりもかなり大きかった.

結論:

  • 開発されたビスディオキサボリンポリメチンの染料は,全光信号処理の優れた実績を持っています.
  • これらの材料は,通信帯域全体のアプリケーションに適しています.
  • この研究は,これらの有機材料が先進的な光子装置に持つ可能性を強調しています.