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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...
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...
Photoluminescence: Applications01:14

Photoluminescence: Applications

Photoluminescence offers a wide range of applications due to its inherent sensitivity and selectivity. This technique allows for both direct and indirect analyses of the analyte. Direct quantitative analysis is possible when the analyte exhibits a favorable quantum yield for fluorescence or phosphorescence. However, an indirect analysis may be feasible if the analyte is not fluorescent or phosphorescent, or if the quantum yield is unfavorable. Indirect methods include reacting the analyte with...
Coordination Compounds and Nomenclature02:54

Coordination Compounds and Nomenclature

In most main group element compounds, the valence electrons of the isolated atoms combine to form chemical bonds that satisfy the octet rule. For instance, the four valence electrons of carbon overlap with electrons from four hydrogen atoms to form CH4. The one valence electron leaves sodium and adds to the seven valence electrons of chlorine to form the ionic formula unit NaCl (Figure 1a). Transition metals do not normally bond in this fashion. They primarily form coordinate covalent bonds, a...
Coordination Number and Geometry02:57

Coordination Number and Geometry

For transition metal complexes, the coordination number determines the geometry around the central metal ion. Table 1 compares coordination numbers to molecular geometry. The most common structures of the complexes in coordination compounds are octahedral, tetrahedral, and square planar.

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Facet-to-facet Linking of Shape-anisotropic Colloidal Cadmium Chalcogenide Nanostructures
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Published on: August 10, 2017

Luminescent coordination polymers based on self-assembled cadmium dipyrrin complexes.

Antoine Béziau1, Stéphane A Baudron, Aurélie Guenet

  • 1Laboratoire de Chimie de Coordination Organique, UMR UdS-CNRS 7140, Institut Le Bel, Université de Strasbourg, 4 rue Blaise Pascal, CS 90032, 67081 Strasbourg cedex, France.

Chemistry (Weinheim an Der Bergstrasse, Germany)
|January 18, 2013
PubMed
Summary

Novel cadmium(II) complexes with dipyrrin ligands were synthesized. These complexes form coordination polymers and exhibit luminescence, offering new materials for photophysical applications.

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A Novel Technique for Generating and Observing Chemiluminescence in a Biological Setting
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Facet-to-facet Linking of Shape-anisotropic Colloidal Cadmium Chalcogenide Nanostructures
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A Novel Technique for Generating and Observing Chemiluminescence in a Biological Setting
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A Novel Technique for Generating and Observing Chemiluminescence in a Biological Setting

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Area of Science:

  • Coordination Chemistry
  • Materials Science
  • Photophysics

Background:

  • Dipyrrin ligands are versatile building blocks in coordination chemistry.
  • Cadmium(II) complexes with dipyrrin ligands have been explored for their structural and photophysical properties.
  • Understanding the self-assembly behavior of metal complexes is crucial for designing functional materials.

Purpose of the Study:

  • To synthesize and characterize novel cadmium(II) complexes using α,β-unsubstituted dipyrrin (dpm) ligands.
  • To investigate the influence of appended pyridyl or imidazolyl groups on the coordination behavior of Cd(II).
  • To explore the formation of coordination polymers and their luminescent properties.

Main Methods:

  • Synthesis of Cd(II) complexes with dpm ligands.
  • Characterization using solution and solid-state techniques.
  • X-ray diffraction analysis for structural determination.
  • Photophysical measurements (luminescence spectroscopy).

Main Results:

  • Formation of discrete [Cd(dpm)2] complexes.
  • Observation of six-coordinate, octahedral Cd(II) complexes when using pyridyl- or imidazolyl-appended dpm ligands.
  • Self-assembly leading to 1D, 2D, and 3D coordination polymers.
  • Demonstration of luminescence in both discrete complexes and coordination polymers in the solid state.

Conclusions:

  • Novel Cd(II) dipyrrin complexes exhibit diverse coordination behaviors.
  • Functionalized dipyrrin ligands promote the formation of extended coordination networks.
  • These cadmium(II) coordination compounds are promising luminescent materials.