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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.
Stereoisomerism02:52

Stereoisomerism

Isomerism in Complexes
Isomers are different chemical species that have the same chemical formula.
Transition metal complexes often exist as geometric isomers, in which the same atoms are connected through the same types of bonds but with differences in their orientation in space. Coordination complexes with two different ligands in the cis and trans positions from a ligand of interest form isomers. For example, the octahedral [Co(NH3)4Cl2]+ ion has two isomers (Figure 1) In the cis...
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...
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...

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Related Experiment Video

Updated: Jul 8, 2026

Fabrication Procedures and Birefringence Measurements for Designing Magnetically Responsive Lanthanide Ion Chelating Phospholipid Assemblies
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Lanthanide-Dependent Switching between Magnetic and Optical Thermometry in Structurally Analogous Complexes.

Shraoshee Shome1, Arindam Gupta1, Naresh Chandra Maurya2

  • 1Molecular Magnetism Lab, Department of Chemistry, Indian Institute of Science Education and Research Bhopal, Bhopal Bypass Road, Bhauri, Madhya Pradesh 462066, India.

Inorganic Chemistry
|July 6, 2026
PubMed
Summary

This study shows how changing the metal ion in lanthanide complexes can switch temperature sensing from magnetic to luminescent. This metal-dependent approach enhances molecular thermometer applications.

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High-resolution Thermal Micro-imaging Using Europium Chelate Luminescent Coatings
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High-resolution Thermal Micro-imaging Using Europium Chelate Luminescent Coatings

Published on: April 16, 2017

Area of Science:

  • Coordination Chemistry
  • Materials Science
  • Molecular Magnetism

Background:

  • Accurate temperature sensing is vital for single-molecule magnets (SMMs).
  • Luminescence-based thermometers face challenges due to inefficient energy transfer in lanthanide SMMs.
  • Developing versatile molecular thermometers is an ongoing research area.

Purpose of the Study:

  • To investigate the thermometric behavior of structurally analogous dinuclear lanthanide complexes.
  • To explore a metal-dependent strategy for modulating thermometric function (magnetic vs. luminescent).
  • To expand the utility of lanthanide complexes in temperature sensing applications.

Main Methods:

  • Synthesis and characterization of two dinuclear lanthanide complexes: Dy3+ and Eu3+ analogues.
  • Magnetic susceptibility measurements for the Dy3+ complex as a magnetic thermometer.
  • Luminescence spectroscopy for the Eu3+ complex as a luminescent thermometer.

Main Results:

  • The Dy3+ complex demonstrated single-molecule magnet behavior and functioned as a magnetic thermometer (15-100 K) with a maximum relative thermal sensitivity (Smax) of 6.65% K-1.
  • The Eu3+ complex operated as a luminescent thermometer with an Smax of 2.15% K-1 at 350 K.
  • Divergent thermometric responses were attributed to differences in ligand-metal energy-level alignment.

Conclusions:

  • The choice of metal ion dictates the thermometric mechanism (magnetic or luminescent) in these lanthanide complexes.
  • A metal-dependent approach offers a new strategy for tuning molecular thermometer functionality.
  • This work broadens the scope of lanthanide complexes for advanced temperature sensing beyond luminescence.