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相关概念视频

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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相关实验视频

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Quasi-light Storage for Optical Data Packets
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Published on: February 6, 2014

对于全光信号处理而言,具有较大的第三阶非线性 bisdioxaborine 聚合甲基.

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
概括

新的聚甲染料为全光信号处理提供了重大进步. 这些有机材料表现出大,超快的第三阶非线性和近红外线的低损失,这对光子设备至关重要.

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Qualitative Identification of Carboxylic Acids, Boronic Acids, and Amines Using Cruciform Fluorophores
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科学领域:

  • 有机非线性光学是有机非线性光学.
  • 材料科学用于光子学.
  • 完全光学信号处理器

背景情况:

  • 具有较大的第三阶非线性有机材料对于全光信号处理至关重要.
  • 近红外光谱系统对于光子设备的开发至关重要.

研究的目的:

  • 开发具有增强第三阶非线性光学性能的新型聚甲材料.
  • 为了研究近红外应用 bisdioxaborine终结的聚甲染料.

主要方法:

  • 扩展 bisdioxaborine 聚甲离子的合成和表征.
  • 在1.3微米处测量第三阶微观非线性 () 度.
  • 评估整洁膜的线性和非线性光学特性,包括三级宏观非线性 (chi) 和时间响应.

主要成果:

  • 一个扩展 bisdioxaborine 聚合甲离子在1.3μm时显示出一个很大的第三阶微观非线性 (RawgammaRawgammaRawgammaRawgammaRawgammaRawgammaRawgammaRawgammaRawgammaRawgammaRawgammaRawgammaRawgammaRawgammaRawgammaRawgammaRawgammaRawgammaRawgammaRawgammaRawgammaRawgammaRawgammaRawgammaRawgammaRawgammaRawgammaRawgammaRawgammaRawgammaRawgammaRawgammaRawgammaRawgammaRawgammaRawgammaRawgammaRawgammaRawgammaRawgammaRawgammaRawgammaRawgammaRawgammaRawgammaRawgammaRawgammaRawgammaRawgammaRawgammaRawgammaRawgammaRawgammaRawg).
  • 清洁片表现出较低的线性损失和显著的第三级宏观非线性 (dakchi(3) dakchi = 3.6 x 10^-10 esu),响应时间小于8秒.
  • 奇数 (3) 的实部分比虚构部分大得多.

结论:

  • 开发的二氧化聚甲染料在全光信号处理方面具有出色的优点.
  • 这些材料适用于整个电信频段的应用.
  • 该研究强调了这些有机材料在先进的光子设备中的潜力.