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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.
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...
Complexometric Titration: Ligands00:43

Complexometric Titration: Ligands

Different monodentate and polydentate ligands are used as complexing agents in complexometric titration reactions. The formation of complexes by mono- and bidentate ligands involves two or more intermediate steps, limiting their use as complexing agents. In comparison, polydentate ligands can form complexes with metal ions in a single-step process, facilitating sharper end points. This means polydentate ligands, such as amino carboxylic acid derivatives, are most commonly employed in...
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...

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Related Experiment Video

Updated: Jun 9, 2026

Hyperspectral Imaging as a Tool to Study Optical Anisotropy in Lanthanide-Based Molecular Single Crystals
07:24

Hyperspectral Imaging as a Tool to Study Optical Anisotropy in Lanthanide-Based Molecular Single Crystals

Published on: April 14, 2020

New homotrinuclear lanthanide complexes: synthesis, characterization and spectroscopic study.

Wagner E Silva1, Mônica Freire Belian, Ricardo O Freire

  • 1Departamento de Química Fundamental, UFPE, 50670-901 Recife, Pernambuco, Brazil. wagner.silva@ufpe.br

The Journal of Physical Chemistry. A
|August 27, 2010
PubMed
Summary

New homotrinuclear lanthanide complexes were synthesized for photonics. These systems, featuring europium (Eu(III)) and terbium (Tb(III)) ions, exhibit promising luminescence properties and high quantum yields, paving the way for advanced optical applications.

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Area of Science:

  • Inorganic Chemistry
  • Materials Science
  • Photonic Applications

Background:

  • Lanthanide complexes are crucial for photonics due to their unique luminescence properties.
  • Homotrinuclear systems offer potential for enhanced energy transfer and tailored optical characteristics.
  • Understanding the photophysical processes in these complexes is key to optimizing their performance.

Purpose of the Study:

  • To synthesize and characterize novel homotrinuclear lanthanide complexes.
  • To investigate the luminescence spectroscopy of europium (Eu(III)) and terbium (Tb(III)) ions within these systems.
  • To explore the potential of these complexes for advanced photonics applications.

Main Methods:

  • Synthesis of homotrinuclear (TRI) lanthanide complexes.
  • Luminescence and phosphorescence spectroscopy for studying electronic transitions and triplet states.
  • Computational modeling using the Sparkle/AM1 method for coordination geometries and energy transfer calculations.
  • Analysis using Jablonski diagrams to elucidate luminescent processes.

Main Results:

  • Characteristic luminescence transitions of Eu(III) and Tb(III) ions were observed.
  • Triplet states for Gd(III) complexes were determined.
  • Theoretical quantum yields were calculated for europium systems, correlating with experimental observations.
  • Synthesized complexes demonstrated high quantum yields in ethanol: 50% for EuTRIDipy, 26% for EuTRITerpy, and 56% for EuTRIPhen.

Conclusions:

  • The study successfully synthesized and characterized novel homotrinuclear lanthanide complexes for photonics.
  • Computational and spectroscopic analyses provided insights into energy transfer mechanisms and luminescence behavior.
  • The synthesized complexes exhibit significant potential for applications in photonics, particularly due to their high quantum yields.