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UV–Vis Spectroscopy of Conjugated Systems01:32

UV–Vis Spectroscopy of Conjugated Systems

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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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The absorption of UV–visible light by conjugated systems causes the promotion of an electron from the ground state to the excited state. Consequently, photochemical electrocyclic reactions proceed via the excited-state HOMO rather than the ground-state HOMO. Since the ground- and excited-state HOMOs have different symmetries, the stereochemical outcome of electrocyclic reactions depends on the mode of activation; i.e., thermal or photochemical.
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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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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 Spectrum01:30

UV–Vis Spectrum

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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.     
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UV-absorption--the primary process in photocatalysis and some practical consequences.

Terry A Egerton1

  • 1School of Chemical Engineering and Advanced Materials, University of Newcastle, Newcastle NE1 7RU, UK. Terry.Egerton@ncl.ac.uk.

Molecules (Basel, Switzerland)
|November 11, 2014
PubMed
Summary

This review highlights UV absorption in titanium dioxide (TiO2) photocatalysis, emphasizing particle size effects on light interaction and photochemical outcomes. Understanding TiO2

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Area of Science:

  • Photochemistry
  • Materials Science
  • Environmental Science

Background:

  • Titanium dioxide (TiO2) photocatalysis research typically focuses on charge-carrier reactions and recombination.
  • This review shifts focus to UV absorption, the initial photochemical step in TiO2 photocatalysis.

Purpose of the Study:

  • To review the influence of particle size on UV absorption and light scattering by TiO2 particles.
  • To examine the consequences of UV absorption in TiO2 applications, including material protection and organic degradation.

Main Methods:

  • Summarizing existing literature on TiO2 particle size effects on light absorption and scattering.
  • Analyzing the impact of UV absorption on TiO2's protective capabilities in pigmented systems.
  • Investigating UV absorption's role in TiO2-mediated degradation of organic compounds in aqueous solutions.

Main Results:

  • Particle size significantly influences TiO2's UV absorption and light scattering properties.
  • TiO2 effectively protects pigmented polymer films and paints from photochemical degradation via UV absorption.
  • UV absorption by TiO2 affects hydroxyl radical generation from H2O2 and influences the photocatalytic degradation rates of propan-2-ol and salicylic acid.

Conclusions:

  • The effective particle size in application, not just BET or X-ray size, is crucial for understanding TiO2 photochemistry.
  • UV absorption is a critical, often overlooked, factor influencing TiO2 performance in various applications.
  • Further research should consider UV absorption effects when evaluating TiO2-based photocatalytic systems.