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Related Concept Videos

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

Ultraviolet and Visible (UV–Vis) Spectroscopy: Overview

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 electronic transitions. As a result...
UV–Vis Spectroscopy of Conjugated Systems01:32

UV–Vis Spectroscopy of Conjugated Systems

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 the...
Molecular Spectroscopy: Absorption and Emission01:14

Molecular Spectroscopy: Absorption and Emission

Molecules possess discrete energy levels called quantum states. Unlike atoms, which have simpler energy levels, molecules possess additional rotational and vibrational energy levels. Each energy level is separated by an energy gap, with the gaps between adjacent electronic, vibrational, and rotational levels varying significantly. The three types of energy levels in a diatomic molecule are shown in Figure 1.
UV–Vis Spectroscopy: Molecular Electronic Transitions01:16

UV–Vis Spectroscopy: Molecular Electronic Transitions

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

UV–Vis Spectroscopy: Woodward–Fieser Rules

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

IR Spectroscopy: Molecular Vibration Overview

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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Related Experiment Video

Updated: Jul 14, 2026

Raman and IR Spectroelectrochemical Methods as Tools to Analyze Conjugated Organic Compounds
09:11

Raman and IR Spectroelectrochemical Methods as Tools to Analyze Conjugated Organic Compounds

Published on: October 12, 2018

Bidimensional spectroelectrochemistry.

J López-Palacios1, A Colina, A Heras

  • 1Area de Química Analítica, Universidad de Burgos, Pza Misael Bañuelos, Spain. jlopal@ubu.es

Analytical Chemistry
|July 27, 2001
PubMed
Summary

This study introduces a novel bidimensional spectroelectrochemistry method. Combining normal and parallel UV-vis absorbance signals provides a comprehensive understanding of electrode reaction mechanisms.

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Raman and IR Spectroelectrochemical Methods as Tools to Analyze Conjugated Organic Compounds
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Raman and IR Spectroelectrochemical Methods as Tools to Analyze Conjugated Organic Compounds

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Using Cyclic Voltammetry, UV-Vis-NIR, and EPR Spectroelectrochemistry to Analyze Organic Compounds
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Using Cyclic Voltammetry, UV-Vis-NIR, and EPR Spectroelectrochemistry to Analyze Organic Compounds

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Multimodal Nonlinear Hyperspectral Chemical Imaging Using Line-Scanning Vibrational Sum-Frequency Generation Microscopy
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Multimodal Nonlinear Hyperspectral Chemical Imaging Using Line-Scanning Vibrational Sum-Frequency Generation Microscopy

Published on: December 1, 2023

Area of Science:

  • Electrochemistry
  • Spectroscopy
  • Analytical Chemistry

Background:

  • Traditional spectroelectrochemistry often uses a single signal acquisition mode.
  • Understanding electrode surface reactions requires analyzing spatial and electronic properties.
  • Limitations exist in characterizing complex electrochemical processes with conventional methods.

Purpose of the Study:

  • To present a new methodology for simultaneous acquisition of two distinct spectroscopic signals in one spectroelectrochemical experiment.
  • To demonstrate the utility of bidimensional spectroelectrochemistry for analyzing electrode reactions.
  • To highlight the complementary nature of normal-beam and parallel-beam UV-vis absorbance signals.

Main Methods:

  • Development of a novel spectroelectrochemical setup enabling simultaneous data collection.
  • Utilizing normal-beam and parallel-beam UV-vis absorbance spectroscopy with the electrode surface as a spatial reference.
  • Analysis of two distinct chemical systems: a simple diffusive process and an adsorptive electrode reaction.

Main Results:

  • The methodology allows for simultaneous acquisition of normal-beam and parallel-beam UV-vis absorbance signals.
  • Significant experimental differences were observed between the two signal types.
  • Bidimensional spectroelectrochemistry effectively characterized both diffusive and adsorptive electrode reactions.
  • The study revealed distinct information obtained from each spectroscopic beam orientation.

Conclusions:

  • The combined analysis of normal and parallel spectroscopic signals is crucial for a complete understanding of electrode reaction mechanisms.
  • Bidimensional spectroelectrochemistry offers enhanced insights compared to single-signal approaches.
  • This technique provides a powerful tool for studying interfacial electrochemical processes.