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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...
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.
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.
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...
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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Amide Coupling Reaction for the Synthesis of Bispyridine-based Ligands and Their Complexation to Platinum as Dinuclear Anticancer Agents
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Beyond classical coordination: silver-pi interactions in metal dipyrrin complexes.

Domingo Salazar-Mendoza1, Stéphane A Baudron, Mir Wais Hosseini

  • 1Laboratoire de Chimie de Coordination Organique (UMR 7140), Université Louis Pasteur, Institut Le Bel, 4 rue Blaise Pascal, 67000, Strasbourg, France.

Chemical Communications (Cambridge, England)
|May 31, 2007
PubMed
Summary

New silver complexes with zinc and copper dipyrrin ligands create unique Ag(I)-C=C double bond interactions in solid form. This discovery offers novel insights into metal-ligand bonding and crystal engineering.

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Structure and Coordination Determination of Peptide-metal Complexes Using 1D and 2D 1H NMR

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Area of Science:

  • Coordination Chemistry
  • Supramolecular Chemistry
  • Crystal Engineering

Background:

  • Dipyrrin ligands are versatile building blocks in coordination chemistry.
  • Metal complexes of zinc (Zn) and copper (Cu) with dipyrrin ligands have been extensively studied.
  • Understanding non-covalent interactions is crucial for designing advanced materials.

Purpose of the Study:

  • To investigate the formation of novel silver (Ag) complexes using homo- and hetero-leptic Zn and Cu dipyrrin complexes.
  • To explore the structural characteristics and bonding interactions within these new Ag(I) complexes.
  • To report the unprecedented formation of Ag(I)-C=C double bond interactions in the crystalline phase.

Main Methods:

  • Synthesis of homo- and hetero-leptic Zn and Cu dipyrrin complexes.
  • Complexation of these metal complexes with silver cations.
  • Single-crystal X-ray diffraction analysis to determine the solid-state structures.
  • Spectroscopic characterization (e.g., NMR, UV-Vis) to confirm complex formation.

Main Results:

  • Successful synthesis of novel Ag(I) complexes incorporating Zn and Cu dipyrrin units.
  • Observation of unprecedented Ag(I)-C=C double bond interactions in the crystalline state.
  • Detailed structural analysis revealing the coordination environment and intermolecular interactions.

Conclusions:

  • The combination of specific Zn and Cu dipyrrin complexes with silver cations leads to the formation of unique Ag(I)-C=C interactions.
  • These findings expand the known repertoire of metal-ligand interactions in the solid state.
  • This study provides a foundation for the rational design of new supramolecular architectures and functional materials.