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相关概念视频

IR Spectrum01:19

IR Spectrum

3.3K
When infrared (IR) radiation passes through a molecule, the bonds stretch or bend by absorbing the radiation. This absorption creates the molecule's absorption spectrum, which is the plot of its percentage transmittance versus wavenumber.
Transmittance is defined as the ratio of the radiant power passing through a sample to that from the radiation's source. Multiplying the transmittance by 100 gives the percent transmittance (%T), which varies between 100% (no absorption) and 0%...
3.3K
IR Spectrum Peak Intensity: Amount of IR-Active Bonds00:55

IR Spectrum Peak Intensity: Amount of IR-Active Bonds

1.1K
When infrared radiation is passed through a molecule, absorption occurs if the molecule's vibration leads to a substantial change in its bond dipole moment. Transitions between vibrational energy levels, typically corresponding to infrared frequencies (4000–400 cm−1), allow absorption if the vibration significantly alters the dipole moment, making the molecule infrared active. The molecular bonds have different stretching and bending vibrations, resulting in various peaks with...
1.1K
IR and UV–Vis Spectroscopy of Aldehydes and Ketones01:29

IR and UV–Vis Spectroscopy of Aldehydes and Ketones

5.1K
Infrared spectroscopy, also known as vibrational spectroscopy, is mainly used to determine the types of bonds and functional groups in molecules. In aldehydes and ketones, the carbonyl (C=O) bond shows an absorption around 1710 cm-1. The C=O bond vibration of an aldehyde occurs at lower frequencies than that of a ketone. In addition to the C=O absorption in an aldehyde, the aldehydic C–H bond also gives two peaks in the 2700–2800 cm-1 range. This absorption, coupled with the...
5.1K
Spectroscopy of Carboxylic Acid Derivatives01:26

Spectroscopy of Carboxylic Acid Derivatives

2.2K
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...
2.2K
UV–Vis Spectroscopy of Conjugated Systems01:32

UV–Vis Spectroscopy of Conjugated Systems

5.9K
Organic compounds with conjugated double bonds show strong absorption features in the UV–visible region of the electromagnetic spectrum attributed to π → π* electronic excitations. Generally, a UV–vis absorption spectrum is recorded as a plot of absorbance vs wavelength. The wavelength of maximum absorbance, which manifests as a peak in the absorption spectrum, is denoted as λmax.
One of the factors influencing λmax is...
5.9K
IR Spectrum Peak Intensity: Dipole Moment01:20

IR Spectrum Peak Intensity: Dipole Moment

1.7K
The dipole moment of a bond is the product of the partial charge on either atom and the distance between them. Dipole moments influence the efficiency of IR absorption and the peak intensity. When a bond with a dipole moment is placed in an electric field, the direction of the field determines if the bond is compressed or stretched. Electromagnetic radiation consists of an electric field component that rapidly reverses direction. It follows that polar bonds are alternately stretched and...
1.7K

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Updated: May 2, 2026

Diffuse Reflectance Infrared Spectroscopic Identification of Dispersant/Particle Bonding Mechanisms in Functional Inks
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稳定在空气中的2,2'-阿佐比斯皮里丁激素-复合物及其近红外吸收特性.

Toshihiro Moriya1, Takuma Kuroda1, Kazuya Kubo1

  • 1Department of Material Science, Graduate School of Science, University of Hyogo, Ako-gun, Hyogo, Japan.

Chemistry (Weinheim an der Bergstrasse, Germany)
|January 20, 2026
PubMed
概括
此摘要是机器生成的。

研究人员使用复合物开发出稳定的以为中心的基因,实现近红外吸收. 这一突破为设计先进的基因基材料和NIR功能染料提供了新的途径.

关键词:
2,2′-阿佐比斯皮里丁是什么- 协调键 - 协调键接近红外的染料.稳定的基因是稳定的基因.

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科学领域:

  • 材料科学 材料科学 材料科学
  • 有机化学 有机化学
  • 频谱学是一种光谱学.

背景情况:

  • 空气稳定的以为中心的基因对于开发功能分子材料至关重要.
  • 2,2'-阿佐比斯皮里丁衍生物是基于基因的应用的潜在候选者.

研究的目的:

  • 为了合成和表征新型的2,2'-阿佐比斯皮里丁基-复合物.
  • 调查复合对基结稳定性和光学性能的影响.
  • 探索它们作为近红外 (NIR) 吸收材料的潜力.

主要方法:

  • 替代的2,2'-阿佐比斯皮里丁框架的合成.
  • 一个电子的氧化产生基质物种.
  • 使用电子自旋共振 (ESR) 光谱,密度函数理论 (DFT) 计算和单晶X射线衍射进行隔离和表征.
  • UV-Vis-NIR光谱法用于确定吸收特性.

主要成果:

  • 成功合成了稳定在空气和水中的B(C6F5) 2 - 置换的2,2'-阿佐比斯皮里丁基复合物.
  • 在ESR和DFT研究中,证实了未配对电子在2.2'-阿佐比斯皮里丁核上的脱离.
  • 激素复合体在800-1140纳米范围内表现出显著的NIR吸收,可通过替代剂调节.
  • 结构分析显示,N-N键在氧化时缩短.

结论:

  • 复合有效地稳定了2,2'-阿佐比斯皮里丁基.
  • 这种策略允许精确调整光学特性,特别是NIR吸收.
  • 开发的激素复合物代表了NIR功能染料和基于激素的先进材料的有希望的平台.