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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 Spectrometers01:14

UV–Vis Spectrometers

2.0K
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 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.
One of the factors influencing λmax is the extent of conjugation in...
7.7K
UV–Vis Spectroscopy: Molecular Electronic Transitions01:16

UV–Vis Spectroscopy: Molecular Electronic Transitions

2.1K
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...
2.1K
UV–Vis Spectrum01:30

UV–Vis Spectrum

1.6K
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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Updated: Nov 2, 2025

Applying Cheminformatics to Develop a Structure Searchable Database of Analytical Methods
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UV/Vis+ photochemistry database: Structure, content and applications.

Andreas Noelle1, Ann Carine Vandaele2, Javier Martin-Torres3,4,5

  • 1science-softCon, Auf der Burg 4, 63477 Maintal, Germany.

Journal of Quantitative Spectroscopy & Radiative Transfer
|June 14, 2021
PubMed
Summary

The science-softCon UV/Vis+ Photochemistry Database offers extensive spectral and photochemical data from peer-reviewed literature. This resource aids understanding of molecular photochemistry across diverse scientific and applied fields.

Keywords:
DatabasePhotochemistryRadiative transferSpectroscopyUV/Vis

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Area of Science:

  • Photochemistry
  • Spectroscopy
  • Astrochemistry
  • Environmental Chemistry
  • Biochemistry
  • Catalysis

Background:

  • Comprehensive spectral and photochemical data are essential for molecular-level understanding.
  • Existing data are often scattered across peer-reviewed literature.
  • A centralized, curated database is needed for efficient research.

Purpose of the Study:

  • To outline the structure and content of the science-softCon UV/Vis+ Photochemistry Database.
  • To highlight the database's utility in various scientific disciplines.
  • To demonstrate practical applications of the database.

Main Methods:

  • Compilation of EUV-VUV-UV-Vis-NIR spectral data and photochemical information.
  • Inclusion of absorption, fluorescence, photoelectron, and dichroism spectra.
  • Inclusion of quantum yields and photolysis data from published sources.

Main Results:

  • The database provides accurate and reliable molecular-level photochemical information.
  • It covers a wide range of spectral data and related photochemical parameters.
  • Illustrative examples showcase the database's application in four distinct scientific fields.

Conclusions:

  • The UV/Vis+ Photochemistry Database is a fundamental resource for researchers.
  • It facilitates advancements in spectroscopy, astrochemistry, environmental science, and applied fields.
  • The database supports understanding of photon, electron, and ion-induced chemistry.