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Related Concept Videos

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...
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 Spectrometers01:14

UV–Vis Spectrometers

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. Samples for...
UV–Vis Spectrum01:30

UV–Vis Spectrum

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 absorptivity (ε) or log ε on the y-axis (ordinate)...
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...
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,...

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ExTTF-based dyes absorbing over the whole visible spectrum.

Pierre-Antoine Bouit1, Carmen Villegas, Juan Luis Delgado

  • 1IMDEA-Nanociencia, Facultad de Ciencias, Módulo C-IX, 3a planta, Ciudad Universitaria de Cantoblanco, 28049 Madrid, Spain.

Organic Letters
|January 11, 2011
PubMed
Summary

New push-pull dyes with π-extended tetrathiafulvalene (exTTF) donors and tricyanofuran (TCF) acceptors were synthesized. These dyes exhibit broad visible-to-near-infrared absorption, making them promising for photovoltaic applications.

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Area of Science:

  • Materials Science
  • Organic Chemistry
  • Photovoltaics

Background:

  • Development of novel organic dyes is crucial for advancing solar energy conversion technologies.
  • Push-pull dyes with strong donor-acceptor interactions are essential for efficient light harvesting.

Purpose of the Study:

  • Synthesize and characterize new push-pull dyes incorporating π-extended tetrathiafulvalene (exTTF) as the donor and tricyanofuran (TCF) as the acceptor.
  • Investigate the photophysical and electronic properties of these novel dyes.
  • Evaluate their potential as light harvesters in photovoltaic devices.

Main Methods:

  • Organic synthesis of novel exTTF-TCF dyes.
  • Spectroscopic characterization (UV-Vis absorption).
  • Electrochemical analysis (cyclic voltammetry).
  • Theoretical calculations (DFT).

Main Results:

  • Successful synthesis and characterization of new exTTF-TCF push-pull dyes.
  • Broad absorption spectra spanning the visible and near-infrared regions.
  • Unique electronic properties elucidated through electrochemistry and theoretical studies.

Conclusions:

  • The synthesized exTTF-TCF dyes possess broad absorption and favorable electronic properties.
  • These novel dyes are promising candidates for light harvesters in next-generation photovoltaic devices.