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Related Concept Videos

Colors and Magnetism03:02

Colors and Magnetism

Color in Coordination Complexes
When atoms or molecules absorb light at the proper frequency, their electrons are excited to higher-energy orbitals. For many main group atoms and molecules, the absorbed photons are in the ultraviolet range of the electromagnetic spectrum, which cannot be detected by the human eye. For coordination compounds, the energy difference between the d orbitals often allows photons in the visible range to be absorbed and emitted, which is seen as colors by the human eye.
Crystal Field Theory - Octahedral Complexes02:58

Crystal Field Theory - Octahedral Complexes

Crystal Field Theory
To explain the observed behavior of transition metal complexes (such as colors), a model involving electrostatic interactions between the electrons from the ligands and the electrons in the unhybridized d orbitals of the central metal atom has been developed. This electrostatic model is crystal field theory (CFT). It helps to understand, interpret, and predict the colors, magnetic behavior, and some structures of coordination compounds of transition metals.
CFT focuses on...
Valence Bond Theory02:42

Valence Bond Theory

Coordination compounds and complexes exhibit different colors, geometries, and magnetic behavior, depending on the metal atom/ion and ligands from which they are composed. In an attempt to explain the bonding and structure of coordination complexes, Linus Pauling proposed the valence bond theory, or VBT, using the concepts of hybridization and the overlapping of the atomic orbitals. According to VBT, the central metal atom or ion (Lewis acid) hybridizes to provide empty orbitals of suitable...
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...
Lewis Structures of Molecular Compounds and Polyatomic Ions02:54

Lewis Structures of Molecular Compounds and Polyatomic Ions

To draw Lewis structures for complicated molecules and molecular ions, it is helpful to follow a step-by-step procedure as outlined:
Electron Configurations02:46

Electron Configurations

Electron configurations and orbital diagrams can be determined by applying the Aufbau principle (each added electron occupies the subshell of lowest energy available), Pauli exclusion principle (no two electrons can have the same set of four quantum numbers), and Hund’s rule of maximum multiplicity (whenever possible, electrons retain unpaired spins in degenerate orbitals).
The relative energies of the subshells determine the order in which atomic orbitals are filled (1s, 2s, 2p, 3s, 3p, 4s,...

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Related Experiment Video

Updated: May 14, 2026

TD-DFT Guided Advanced E-Eye Sensing Technique for On-site Quantification of Fe, Cr, F, and As in the Environmental, Biological, and Food Samples
09:51

TD-DFT Guided Advanced E-Eye Sensing Technique for On-site Quantification of Fe, Cr, F, and As in the Environmental, Biological, and Food Samples

Published on: September 19, 2025

Electronic structure of Fe- vs. Ru-based dye molecules.

Phillip S Johnson1, Peter L Cook, Ioannis Zegkinoglou

  • 1Department of Physics, University of Wisconsin-Madison, 1150 University Ave., Madison, Wisconsin 53706, USA.

The Journal of Chemical Physics
|February 8, 2013
PubMed
Summary

Iron (Fe) can potentially replace ruthenium (Ru) in dye-sensitized solar cells. Replacing Ru with Fe in octahedral dyes shifts electronic transitions, offering insights for cheaper, efficient solar energy.

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Area of Science:

  • Materials Science
  • Physical Chemistry
  • Computational Chemistry

Background:

  • Ruthenium (Ru)-based dyes are crucial in dye-sensitized solar cells (DSSCs).
  • Exploring cost-effective alternatives like iron (Fe) is vital for commercial viability.
  • Understanding electronic structure differences is key to designing efficient Fe-based dyes.

Purpose of the Study:

  • To investigate the electronic structure differences between Fe- and Ru-based dyes.
  • To determine if Fe can effectively substitute Ru in dye molecules for solar cell applications.
  • To elucidate the impact of metal substitution on electronic transitions in DSSC dyes.

Main Methods:

  • X-ray absorption spectroscopy (XAS) was employed to probe electronic structures.
  • First-principles calculations were utilized for theoretical analysis.
  • Comparison of N 1s and C 1s core-level transitions in different molecular structures.

Main Results:

  • Octahedral Fe-dyes show a downward shift in N 1s-to-π* transitions compared to Ru-dyes, attributed to increased charge transfer to N ligands.
  • C 1s-to-π* transitions exhibit an opposite trend, increasing in energy for Fe-dyes.
  • Porphyrin-based dyes display complex behavior due to competing factors like crystal field, axial ligands, and oxidation states (Fe 2+ vs. Fe 3+).

Conclusions:

  • Fe can be a viable, inexpensive alternative to Ru in certain dye structures for solar cells.
  • Electronic structure modifications upon Fe substitution provide a basis for tuning dye performance.
  • Further research is needed to optimize Fe-based dyes, especially porphyrin derivatives, for enhanced solar cell efficiency.