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Related Concept Videos

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

Ultraviolet and Visible (UV–Vis) Spectroscopy: Overview

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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...
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UV–Vis Spectroscopy: Molecular Electronic Transitions01:16

UV–Vis Spectroscopy: Molecular Electronic Transitions

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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...
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UV–Vis Spectrometers01:14

UV–Vis Spectrometers

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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.
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UV–Vis Spectroscopy: Woodward–Fieser Rules01:29

UV–Vis Spectroscopy: Woodward–Fieser Rules

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UV–Visible absorption spectra of conjugated dienes arise from the lowest energy π → π* transitions. The light-absorbing part of the molecule is called the chromophore, and the substituents directly attached to the chromophore are called auxochromes. A strong correlation exists between the absorption maxima, λmax, and the structure of a conjugated π system. The Woodward–Fieser rules predict the value of λmax for a given structure by adding the...
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UV–Vis Spectrum01:30

UV–Vis Spectrum

3.3K
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...
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UV–Vis Spectroscopy of Conjugated Systems01:32

UV–Vis Spectroscopy of Conjugated Systems

9.2K
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.
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Two-Dimensional Electronic Spectroscopy in the Ultraviolet Wavelength Range.

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  • 1†Department of Physics and Astronomy and ‡Department of Chemistry, University of North Carolina at Chapel Hill, Chapel Hill, North Carolina 27599, United States.

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Ultraviolet two-dimensional (2DUV) spectroscopy offers new insights into biological systems and chemical reactions. Overcoming challenges in laser bandwidth and phase stability enables advanced 2DUV applications.

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Area of Science:

  • Physical Chemistry
  • Spectroscopy
  • Biophysics

Background:

  • Coherent two-dimensional (2D) spectroscopy is crucial for understanding condensed phase processes.
  • Extending 2D spectroscopy to the ultraviolet (UV) range presents significant technical challenges.
  • Biological systems and chemical dynamics often involve electronic resonances in the UV spectral region.

Purpose of the Study:

  • To discuss the methodology and recent advancements in ultraviolet two-dimensional (2DUV) spectroscopy.
  • To highlight the application of 2DUV spectroscopy in studying biological systems and chemical reactions.
  • To explore the future potential and challenges of 2DUV spectroscopy.

Main Methods:

  • Development of techniques to achieve adequate laser bandwidth for 2DUV spectroscopy.
  • Implementation of methods for interferometric phase stability in the UV spectral range.
  • Strategies for suppressing nonlinearities in the sample medium during 2DUV measurements.

Main Results:

  • Substantial progress has been made in both the implementation and application of 2DUV spectroscopy.
  • 2DUV spectroscopy enables the study of biological systems with UV electronic resonances.
  • New insights into elementary chemical reaction dynamics, such as electrocyclic ring opening, are achievable.

Conclusions:

  • Ultraviolet two-dimensional (2DUV) spectroscopy is a powerful emerging technique.
  • Overcoming technical hurdles has paved the way for broader applications of 2DUV spectroscopy.
  • Future developments promise deeper understanding of complex molecular processes.