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Related Concept Videos

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.
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...
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...
Metallic Solids02:37

Metallic Solids

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.
All metallic solids exhibit high thermal and electrical conductivity, metallic luster, and malleability. Many...
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.

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Related Experiment Video

Updated: May 23, 2026

Preparation of Polyoxometalate-based Photo-responsive Membranes for the Photo-activation of Manganese Oxide Catalysts
05:47

Preparation of Polyoxometalate-based Photo-responsive Membranes for the Photo-activation of Manganese Oxide Catalysts

Published on: August 7, 2018

A polyoxometalate-cyanometalate multilayered coordination network.

Jean-Daniel Compain1, Koji Nakabayashi, Shin-ichi Ohkoshi

  • 1Department of Chemistry, School of Science, The University of Tokyo, 7-3-1 Hongo, Bunkyo-Ku, Tokyo 113-0033, Japan.

Inorganic Chemistry
|April 18, 2012
PubMed
Summary

Researchers created a new 3D multilayered coordination network by reacting a polyoxometalate (POM) with iron cyanide. This novel structure is the first to link cyanometalates directly with POMs.

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Synthesis of a Water-soluble Metal–Organic Complex Array
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Preparation of Polyoxometalate-based Photo-responsive Membranes for the Photo-activation of Manganese Oxide Catalysts
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Synthesis of a Water-soluble Metal–Organic Complex Array
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Synthesis of a Water-soluble Metal–Organic Complex Array

Published on: October 8, 2016

Area of Science:

  • Inorganic Chemistry
  • Materials Science
  • Crystallography

Background:

  • Polyoxometalates (POMs) are versatile nanoscale metal-oxide clusters with diverse applications.
  • Cyanometalates are coordination compounds containing metal-carbon-nitrogen bonds.
  • Developing novel coordination networks with unique structural and functional properties is an active research area.

Purpose of the Study:

  • To synthesize and characterize a novel coordination network formed by the reaction of an ε-Keggin polyoxometalate with iron cyanide.
  • To investigate the structural features and bonding interactions within the newly formed material.
  • To establish the first example of a cyanometalate directly bonded to a POM unit.

Main Methods:

  • Synchrotron-radiation X-ray crystallography for detailed structural determination.
  • Infrared (IR) spectroscopy for vibrational analysis.
  • Elemental analysis and thermogravimetric analysis (TGA) for compositional and thermal stability assessment.

Main Results:

  • A novel three-dimensional multilayered coordination network, [ε-PMo(12)O(37)(OH)(3){La(H(2)O)(5)(Fe(CN)(6))(0.25)}(4)], was successfully synthesized.
  • The structure reveals the first instance of direct bonding between a cyanometalate and a polyoxometalate unit.
  • The compound was fully characterized, confirming its unique structure and composition.

Conclusions:

  • The successful synthesis and characterization of this novel coordination network expand the scope of POM-based materials.
  • This work demonstrates a new strategy for constructing complex inorganic frameworks by integrating POMs and cyanometalates.
  • The findings open avenues for exploring new functional materials with tailored properties.