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相关概念视频

Infrared (IR) Spectroscopy: Overview01:09

Infrared (IR) Spectroscopy: Overview

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When electromagnetic radiation passes through a material, atoms or molecules transition from a lower to a higher energy state by absorbing radiation corresponding to the energy difference between the two states. The absorption of infrared (IR) radiation causes transitions between vibrational energy levels in a molecule. Therefore, IR spectroscopy is a useful analytical tool for determining the molecular structure of molecules.
Different compounds display unique properties due to their...
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IR Spectroscopy: Hooke's Law Approximation of Molecular Vibration01:16

IR Spectroscopy: Hooke's Law Approximation of Molecular Vibration

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A covalently bonded heteronuclear diatomic molecule can be modeled as two vibrating masses connected by a spring. The vibrational frequency of the bond can be expressed using an equation derived from Hooke's law, which describes how the force applied to stretch or compress a spring is proportional to the displacement of the spring. In this case, the atoms behave like masses, and the bond acts like a spring.
According to Hooke's law, the vibrational frequency is directly proportional to...
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IR Spectrum01:19

IR Spectrum

1.3K
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%...
1.3K
IR Frequency Region: Fingerprint Region01:03

IR Frequency Region: Fingerprint Region

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IR spectra are divided into two main regions: the diagnostic region and the fingerprint region. The diagnostic region of the spectrum lies above 1500 cm−1. The absorptions resulting from single-bond vibrations of the N–H, C–H, and O–H stretch at higher wavenumbers and appear on the left side of the spectrum. The stretching absorptions of the C≡C and C≡N occur between 2100–2300 cm−1. In contrast, those arising from stretching absorptions of the...
1.1K
IR Spectrum Peak Intensity: Amount of IR-Active Bonds00:55

IR Spectrum Peak Intensity: Amount of IR-Active Bonds

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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...
713
IR Spectroscopy: Molecular Vibration Overview01:24

IR Spectroscopy: Molecular Vibration Overview

2.9K
When Infrared (IR) radiation passes through a covalently bonded molecule, the bonds transition from lower to higher vibrational levels. The fundamental vibrational motions that result in infrared absorption can be classified as stretching or bending vibrations.
Stretching vibrations are vibrational motions that occur along the bond line, changing the bond length or distance between two bonded atoms. They are further distinguished as symmetric or asymmetric. In symmetric stretching, the...
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Updated: Sep 16, 2025

In situ FTIR Spectroscopy as a Tool for Investigation of Gas/Solid Interaction: Water-Enhanced CO2 Adsorption in UiO-66 Metal-Organic Framework
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在红外吸收光谱学上的溶剂排除效应

Young Jong Lee1, Seong-Min Kim1, Sang Hak Lee1,2

  • 1Biosystems and Biomaterials Division, National Institute of Standards and Technology, Gaithersburg, Maryland 20899, United States.

Analytical chemistry
|July 9, 2025
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概括
此摘要是机器生成的。

精确的吸收光谱需要纠正溶剂排除效应,即溶剂分子被溶液分子所取代. 这项研究引入了一种简单的体积法,使用部分特异体积 (PSV) 来获取精确的仅溶解物光谱,这对于分子分析至关重要.

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科学领域:

  • 频谱学是一种光谱学.
  • 分析化学 分析化学
  • 生物物理学的生物物理.

背景情况:

  • 吸收光谱学依赖于溶剂传输作为参考,假设没有溶剂的光吸收.
  • 溶剂排除 (SE) 效应降低了吸收率,导致错误,特别是在水的强烈吸收峰值时.
  • 目前用于SE校正的方法受到光谱宽度和激光源能力的限制.

研究的目的:

  • 开发一种简单的体积测量方法来纠正吸收光谱中的溶剂排除效应.
  • 为了准确地检索仅溶解物的吸收光谱,特别是水溶液中的蛋白质.
  • 为了验证该方法对球状和小分子溶液的有效性.

主要方法:

  • 开发了一种使用部分特异体积 (PSV) 的体积溶剂排除 (SE) 校正方法.
  • 用溶剂吸收补偿 (SAC) 的量子级联激光 (QCL) 光谱系统获得了 Spectra.
  • 该方法在水溶液中的球状蛋白和小分子溶液上进行了测试.

主要成果:

  • 基于PSV的SE校正方法成功地获得了准确的仅溶解物吸收光谱.
  • 该方法在球状蛋白和小分子溶液方面表现出有效性.
  • 通过QCL-SAC系统和SE校正,获得了高分子灵敏度.

结论:

  • 基于PSV的简化SE校正是吸收光谱学中准确量化的一种可靠方法.
  • 这种技术克服了现有方法的局限性,特别是在强溶剂吸收带附近.
  • 该方法提高了对溶液中的多种溶液的光谱分析的可靠性.