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Related Concept Videos

Colors and Magnetism03:02

Colors and Magnetism

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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...
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Valence Bond Theory02:42

Valence Bond Theory

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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...
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Metal-Ligand Bonds02:51

Metal-Ligand Bonds

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The hemoglobin in the blood, the chlorophyll in green plants, vitamin B-12, and the catalyst used in the manufacture of polyethylene all contain coordination compounds. Ions of the metals, especially the transition metals, are likely to form complexes.
In these complexes, transition metals form coordinate covalent bonds, a kind of Lewis acid-base interaction in which both of the electrons in the bond are contributed by a donor (Lewis base) to an electron acceptor (Lewis acid). The Lewis acid in...
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Complexometric Titration: Ligands00:43

Complexometric Titration: Ligands

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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...
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Complexation Equilibria: Factors Influencing Stability of Complexes01:09

Complexation Equilibria: Factors Influencing Stability of Complexes

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In complexation reactions, metal cations are the electron pair acceptors, and the ligands are the electron pair donors. The stability of the metal complexes depends primarily on the complexing ability of the central metal ion and the nature of the ligands. Generally, the complexing ability of the metal ion depends on the size and charge of the ion. As the metal ion size increases, the stability of the metal complexes decreases, provided that the valency of the metal ion and the ligands remain...
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Crystal Field Theory - Octahedral Complexes02:58

Crystal Field Theory - Octahedral Complexes

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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: Apr 30, 2026

Preparation, Purification, and Characterization of Lanthanide Complexes for Use as Contrast Agents for Magnetic Resonance Imaging
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Preparation, Purification, and Characterization of Lanthanide Complexes for Use as Contrast Agents for Magnetic Resonance Imaging

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Molecular magnets based on homometallic hexanuclear lanthanide(III) complexes.

Sourav Das1, Sakiat Hossain, Atanu Dey

  • 1Department of Chemistry, Indian Institute of Technology Kanpur , Kanpur-208016, India.

Inorganic Chemistry
|April 29, 2014
PubMed
Summary
This summary is machine-generated.

New hexanuclear lanthanide complexes were synthesized and characterized. Compound 2 exhibits single-molecule magnetic behavior, showing potential for advanced magnetic materials.

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

  • Coordination Chemistry
  • Inorganic Chemistry
  • Materials Science

Background:

  • Lanthanide complexes are of interest for their unique magnetic and optical properties.
  • Developing novel molecular magnetic materials requires precise control over metal-ion coordination and structure.

Purpose of the Study:

  • To synthesize and characterize novel hexanuclear lanthanide complexes.
  • To investigate the structural and magnetic properties of these complexes.
  • To explore the potential for single-molecule magnetic behavior in lanthanide clusters.

Main Methods:

  • Reaction of lanthanide(III) chloride salts with a hetero donor chelating ligand (LH3) in the presence of triethylamine.
  • X-ray diffraction studies for structural elucidation.
  • Static (dc) and dynamic (ac) magnetic property measurements.

Main Results:

  • Four hexanuclear lanthanide complexes (Ln = Gd, Dy, Tb, Ho) were successfully synthesized.
  • X-ray diffraction revealed a hexanuclear [Ln6(OH)4](14+) core structure.
  • Single-molecule magnetic behavior was observed in the dysprosium(III) complex (compound 2) with specific energy barrier and relaxation time parameters.

Conclusions:

  • The study successfully synthesized and structurally characterized novel hexanuclear lanthanide complexes.
  • The dysprosium(III) complex demonstrates promising single-molecule magnet properties.
  • These findings contribute to the development of advanced molecular magnetic materials.