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Related Concept Videos

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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Coordination Number and Geometry02:57

Coordination Number and Geometry

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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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Structural Isomerism02:34

Structural Isomerism

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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...
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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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Metallic Solids02:37

Metallic Solids

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Metallic solids such as crystals of copper, aluminum, and iron are formed by metal atoms. The structure of metallic crystals is often described as a uniform distribution of atomic nuclei within a “sea” of delocalized electrons. The atoms within such a metallic solid are held together by a unique force known as metallic bonding that gives rise to many useful and varied bulk properties.
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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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Updated: Jun 17, 2025

Accessing Valuable Ligand Supports for Transition Metals: A Modified, Intermediate Scale Preparation of 1,2,3,4,5-Pentamethylcyclopentadiene
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Accessing Valuable Ligand Supports for Transition Metals: A Modified, Intermediate Scale Preparation of 1,2,3,4,5-Pentamethylcyclopentadiene

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Pyrazine-bridged polymetallic copper-iridium clusters.

Ben J Tickner1, Richard Gammons2, Adrian C Whitwood2

  • 1Centre for Hyperpolarisation in Magnetic Resonance, University of York, Heslington, United Kingdom, YO10 5NY.

Acta Crystallographica. Section E, Crystallographic Communications
|August 7, 2024
PubMed
Summary
This summary is machine-generated.

Researchers synthesized a novel heterometallic cluster containing copper and iridium, featuring a unique molecular structure. This discovery advances the understanding of complex polymetallic compounds and their arrangements.

Keywords:
CuIrclusterscrystal structureheterometallicpolymetallicpyrazine

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Ion Mobility-Mass Spectrometry Techniques for Determining the Structure and Mechanisms of Metal Ion Recognition and Redox Activity of Metal Binding Oligopeptides
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Area of Science:

  • Inorganic Chemistry
  • Materials Science
  • Crystallography

Background:

  • Heterometallic clusters are of interest for their unique electronic and structural properties.
  • The synthesis and structural characterization of novel polymetallic compounds are crucial for advancing coordination chemistry.

Purpose of the Study:

  • To prepare and characterize a novel heterometallic cluster compound containing copper and iridium.
  • To elucidate the unique molecular and crystal structure of the synthesized compound using single-crystal X-ray diffraction.

Main Methods:

  • Single crystal X-ray diffraction was employed to determine the precise atomic arrangement.
  • Synthesis of the {Cu20Ir6Cl8(C21H24N2)6(C4H4N2)3}·3.18CH3OH compound.
  • Analysis of the molecular symmetry, core structure, and ligand coordination.

Main Results:

  • A unique centrosymmetric heterometallic cluster with two {Cu10Ir3} cores bridged by a pyrazine ligand was successfully synthesized.
  • The polymetallic cluster features 13 vertices, 22 faces, and 32 sides, with atoms arranged in four distinct planes.
  • The copper-iridium core exhibits an unusual arrangement with iridium atoms positioned in alternate planes.

Conclusions:

  • The study reports the successful synthesis and detailed structural analysis of a novel, complex heterometallic cluster.
  • The findings provide new insights into the structural diversity and coordination possibilities of polymetallic systems.
  • The unusual Cu-Ir core geometry opens avenues for further investigation into the properties and applications of such compounds.