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Related Concept Videos

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...
Metal-Ligand Bonds02:51

Metal-Ligand Bonds

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...
Structural Isomerism02:34

Structural Isomerism

Isomerism in Complexes
Isomers are different chemical species that have the same chemical formula. Structural isomerism of coordination compounds can be divided into two subcategories, the linkage isomers and coordination-sphere isomers.
Linkage isomers occur when the coordination compound contains a ligand that can bind to the transition metal center through two different atoms. For example, the CN− ligand can bind through the carbon atom or through the nitrogen atom. Similarly, SCN− can be...
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...
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...

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Related Experiment Video

Updated: Jun 24, 2026

Fabrication Procedures and Birefringence Measurements for Designing Magnetically Responsive Lanthanide Ion Chelating Phospholipid Assemblies
09:38

Fabrication Procedures and Birefringence Measurements for Designing Magnetically Responsive Lanthanide Ion Chelating Phospholipid Assemblies

Published on: January 3, 2018

Lanthanide-based coordination polymers assembled by a flexible multidentate linker: design, structure, photophysical

Claire Marchal1, Yaroslav Filinchuk, Xiao-Yan Chen

  • 1Laboratoire de Reconnaissance Ionique et Chimie de Coordination, Service de Chimie Inorganique et Biologique (UMR-E 3 CEA-UJF), CEA/DSM/INAC, CEA-Grenoble, 38054 Grenoble, Cedex 09, France.

Chemistry (Weinheim an Der Bergstrasse, Germany)
|April 2, 2009
PubMed
Summary

This study developed a flexible linker (H(4)tpabn) to create lanthanide coordination polymers. The linker

More Related Videos

Line Shape Analysis of Dynamic NMR Spectra for Characterizing Coordination Sphere Rearrangements at a Chiral Rhenium Polyhydride Complex
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Line Shape Analysis of Dynamic NMR Spectra for Characterizing Coordination Sphere Rearrangements at a Chiral Rhenium Polyhydride Complex

Published on: July 27, 2022

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Last Updated: Jun 24, 2026

Fabrication Procedures and Birefringence Measurements for Designing Magnetically Responsive Lanthanide Ion Chelating Phospholipid Assemblies
09:38

Fabrication Procedures and Birefringence Measurements for Designing Magnetically Responsive Lanthanide Ion Chelating Phospholipid Assemblies

Published on: January 3, 2018

Line Shape Analysis of Dynamic NMR Spectra for Characterizing Coordination Sphere Rearrangements at a Chiral Rhenium Polyhydride Complex
10:52

Line Shape Analysis of Dynamic NMR Spectra for Characterizing Coordination Sphere Rearrangements at a Chiral Rhenium Polyhydride Complex

Published on: July 27, 2022

Area of Science:

  • Coordination Chemistry
  • Materials Science
  • Lanthanide Chemistry

Background:

  • Lanthanide-based coordination polymers are of interest for their unique properties.
  • Designing multidentate linkers is crucial for controlling the assembly of these materials.

Purpose of the Study:

  • To synthesize and characterize novel lanthanide-based 1D coordination polymers using a flexible multidentate linker.
  • To investigate the role of the linker's deprotonation state in directing the final assembly's geometry.
  • To explore the luminescent properties of the resulting coordination polymers.

Main Methods:

  • Synthesis of the multidentate linker N,N',N'-tetrakis[(6-carboxypyridin-2-yl)methyl]butylenediamine (H(4)tpabn).
  • Crystallization of lanthanide ions (Nd, Tb, Er, Eu) with the linker under varying conditions.
  • Single-crystal X-ray diffraction for structural determination.
  • Luminescence spectroscopy to evaluate photophysical properties.

Main Results:

  • The linker successfully directed the formation of 1D coordination polymers with Nd(III) ions.
  • Different deprotonation states of the linker (Htpabn(3-) and tpabn(4-)) led to distinct structural outcomes (1D chains, 2D networks).
  • Tb(III) ions formed 1D zigzag chains and supramolecular isomers (1D/2D).
  • Eu(III) ions formed a 2D network.
  • Polymers exhibited solvent-induced reversible structural transitions.
  • High luminescence quantum yields were observed for Tb(III) and Eu(III) polymers.
  • Near-IR emission was detected for Er(III) and Nd(III) polymers upon water removal.

Conclusions:

  • The flexible linker H(4)tpabn is effective in constructing diverse lanthanide coordination polymer architectures.
  • The linker's deprotonation state significantly influences the self-assembly process and resulting dimensionality.
  • The synthesized coordination polymers display promising luminescent properties, with potential applications in sensing or lighting.