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Related Concept Videos

Ultraviolet and Visible (UV–Vis) Spectroscopy: Overview01:02

Ultraviolet and Visible (UV–Vis) Spectroscopy: Overview

2.6K
Ultraviolet–visible (UV–visible or UV–Vis) spectroscopy is an analytical technique that investigates the interaction between matter and UV–Vis light within the electromagnetic spectrum. This method is widely used for its versatility, simplicity, and relatively quick data acquisition, making it valuable for both qualitative and quantitative analysis. When UV–Vis radiation passes through a material,  molecules absorb light depending on the energy required for...
2.6K
UV–Vis Spectrometers01:14

UV–Vis Spectrometers

1.3K
The absorbance of UV and visible (UV–visible) radiations is measured using a UV–visible spectrophotometer. Deuterium lamps, which emit UV radiation, and tungsten lamps, which produce radiation in the visible region, are used as light sources in UV–visible spectrophotometers. A monochromator or prism is used for diffraction grating, i.e., to split the incoming radiation into different wavelengths. A system of slits is used to focus the desired wavelength on the sample cell.
1.3K
IR and UV–Vis Spectroscopy of Aldehydes and Ketones01:29

IR and UV–Vis Spectroscopy of Aldehydes and Ketones

5.7K
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...
5.7K
UV–Vis Spectroscopy of Conjugated Systems01:32

UV–Vis Spectroscopy of Conjugated Systems

7.0K
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 the extent...
7.0K
UV–Vis Spectroscopy: Molecular Electronic Transitions01:16

UV–Vis Spectroscopy: Molecular Electronic Transitions

1.5K
In Ultraviolet–Visible (UV–Vis) spectroscopy, the absorption of electromagnetic radiation is used to probe the electronic structure of molecules. This technique provides insights into molecular electronic transitions, particularly the movement of electrons between different molecular orbitals. Radiation is absorbed if the energy of the electromagnetic radiation passing through the molecule is precisely equal to the energy difference between the excited and ground states. During this...
1.5K
UV–Vis Spectrum01:30

UV–Vis Spectrum

1.1K
When light passes through a substance, a portion of the light is absorbed while the remaining light is reflected or transmitted. If the molecule absorbs light between the wavelengths of 180–400 nm range, the UV spectrum is obtained, and if it absorbs light in the 400–780 nm wavelength range, the visible spectrum is obtained.     
The UV–Vis spectrum of a molecule is the plot of its absorbance versus wavelength. The plot is drawn by taking molar...
1.1K

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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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In Situ UV-Vis-NIR Absorption Spectroscopy and Catalysis.

Max L Bols1, Jing Ma2, Fatima Rammal2

  • 1Laboratory for Chemical Technology (LCT), University of Ghent, Technologiepark Zwijnaarde 125, 9052 Ghent, Belgium.

Chemical Reviews
|February 26, 2024
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Summary

In situ UV-vis-NIR absorption spectroscopy is a powerful tool for understanding catalysis, enabling detailed mechanistic and kinetic studies across various catalyst types and reaction systems.

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Area of Science:

  • Catalysis
  • Spectroscopy
  • Materials Science

Background:

  • In situ UV-vis-NIR absorption spectroscopy is crucial for characterizing catalytic processes.
  • Understanding reaction mechanisms, kinetics, and structural properties requires advanced spectroscopic techniques.

Purpose of the Study:

  • To review the application of in situ UV-vis-NIR absorption spectroscopy in catalysis.
  • To highlight experimental techniques for mechanistic and kinetic studies.
  • To demonstrate its utility in structural characterization of catalysts.

Main Methods:

  • Utilizing stopped flow techniques, laser pulses, and experimental perturbations for in situ studies.
  • Employing femto- and nanosecond resolved transient absorption measurements for photocatalysis.
  • Combining UV-vis-NIR absorption with techniques like magnetic circular dichroism and resonance Raman spectroscopy.

Main Results:

  • Spectroscopy tracks oxidation states, adsorptions, reactions, and support interactions in transition metal catalysts.
  • In situ studies reveal insights into enzymatic, homogeneous, heterogeneous, and photocatalysis.
  • Advanced analysis techniques overcome challenges like broad absorption bands for tracking complex reactions.

Conclusions:

  • In situ UV-vis-NIR absorption spectroscopy provides valuable insights into catalyst characterization and mechanistic investigations.
  • Its application can be expanded across diverse catalytic systems.
  • Combining multiple spectroscopic methods enhances understanding of catalytic phenomena.