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Related Concept Videos

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.
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 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...
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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Preparation of SNS Cobalt(II) Pincer Model Complexes of Liver Alcohol Dehydrogenase
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A unique three-dimensional coordination cluster based on a silver carbene complex.

Agnes Mrutu1, Diane A Dickie, Karen I Goldberg

  • 1Department of Chemistry and Chemical Biology, University of New Mexico, Albuquerque, New Mexico 87131, USA.

Inorganic Chemistry
|March 4, 2011
PubMed
Summary
This summary is machine-generated.

Researchers unexpectedly synthesized a novel 3D silver-7 cluster with a unique twisted-bowtie core. This discovery involved an unprecedented carbene transfer from nickel to silver, highlighting unusual ligand bonding and structural features.

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Construction and Systematical Symmetric Studies of a Series of Supramolecular Clusters with Binary or Ternary Ammonium Triphenylacetates

Published on: February 15, 2016

Area of Science:

  • Organometallic Chemistry
  • Coordination Chemistry
  • Materials Science

Background:

  • Pincer-carbene ligands are known for their stability and versatile coordination modes.
  • Nickel complexes are widely studied for their catalytic and synthetic applications.
  • Anion-exchange reactions are fundamental transformations in inorganic synthesis.

Purpose of the Study:

  • To investigate the reactivity of a pincer-carbene-ligated nickel complex in anion-exchange reactions.
  • To characterize the unexpected products formed during the reaction with silver nitrate.

Main Methods:

  • Attempted anion-exchange reaction using a pincer-carbene-ligated nickel complex and silver nitrate.
  • Structural characterization of the resulting silver cluster using X-ray crystallography.

Main Results:

  • Formation of an unprecedented three-dimensional (3D) silver-7 cluster featuring a [Ag(6)] core with a twisted-bowtie geometry.
  • Observation of a reverse-transmetalation reaction, transferring the carbene ligand from nickel to silver, a rarely observed phenomenon.
  • The CNC pincer-carbene ligands displayed unusual bridging modes involving all three donor atoms.
  • The final 3D structure resulted from the connection of 2D layers of the [Ag(6)] core by a seventh silver ion.

Conclusions:

  • The reaction conditions led to an unexpected silver cluster formation instead of the intended anion exchange.
  • The study reveals novel coordination behavior of pincer-carbene ligands and unprecedented silver cluster assembly.
  • This finding opens new avenues for the synthesis of complex metal clusters and understanding metal-ligand interactions.