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Related Concept Videos

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.
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...
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...
Valence Bond Theory02:45

Valence Bond Theory

Overview of Valence Bond Theory
Chemical Bonds02:40

Chemical Bonds


Atoms participate in a chemical bond formation to acquire a completed valence-shell electron configuration similar to that of the noble gas nearest to it in atomic number. Ionic, covalent, and metallic bonds are some of the important types of chemical bonds. Bond energy and bond length determine the strength of a chemical bond.
Types of Chemical Bonds
An ionic bond is formed due to electrostatic attraction between cations and anions. Often, the ions are formed by the transfer of electrons from...

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Related Experiment Video

Updated: Jun 3, 2026

Efficient Synthesis of All-Carbon Quaternary Centers via the Conjugate Addition of Functionalized Monoorganozinc Bromides
07:50

Efficient Synthesis of All-Carbon Quaternary Centers via the Conjugate Addition of Functionalized Monoorganozinc Bromides

Published on: May 26, 2019

Coordination chemistry at carbon.

Manuel Alcarazo1, Christian W Lehmann, Anakuthil Anoop

  • 1Max-Planck-Institut für Kohlenforschung, D-45470 Mülheim/Ruhr, Germany.

Nature Chemistry
|March 8, 2011
PubMed
Summary
This summary is machine-generated.

Electron-rich organic compounds, like allenes, exhibit non-canonical bonding. These are best understood as coordination compounds, challenging traditional organic chemistry views.

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

  • Organic Chemistry
  • Inorganic Chemistry
  • Computational Chemistry

Background:

  • Electron-rich allenes and heterocumulenes are typically classified using standard organic chemistry nomenclature.
  • Recent computational studies and prior research suggest unusual bonding in these molecules.

Purpose of the Study:

  • To present crystallographic, reactivity, and theoretical data.
  • To propose a reinterpretation of bonding in electron-rich allenes and heterocumulenes.

Main Methods:

  • X-ray crystallography
  • Reactivity assays
  • Computational modeling
  • Theoretical analysis

Main Results:

  • Data indicate a non-canonical bonding situation in many electron-rich allenes and heterocumulenes.
  • These compounds can be interpreted as coordination complexes with donor-acceptor bonds.
  • The captodative description applies beyond compounds with a carbon(0) center.

Conclusions:

  • The bonding in these organic molecules is better described as coordination chemistry.
  • This captodative bonding model may be broadly applicable to C-C and C-X bonds.
  • This reinterpretation could significantly impact the general understanding of organic chemistry.