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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...
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

Stable Aqueous Suspensions of Manganese Ferrite Clusters with Tunable Nanoscale Dimension and Composition
10:45

Stable Aqueous Suspensions of Manganese Ferrite Clusters with Tunable Nanoscale Dimension and Composition

Published on: February 5, 2022

Cluster-based networks: 1D and 2D coordination polymers based on {MnFe2(μ3-O)}-type clusters.

Galina M Dulcevscaia1, Irina G Filippova, Manfred Speldrich

  • 1Institute of Applied Physics, Academy of Sciences of Moldova, Academiei 5, MD-2028 Chisinau, Republic of Moldova.

Inorganic Chemistry
|April 25, 2012
PubMed
Summary

This study introduces new manganese-iron coordination polymers using mixed-valent manganese and iron clusters. Magnetic studies reveal dominant antiferromagnetic interactions within these novel materials.

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Area of Science:

  • Inorganic Chemistry
  • Materials Science
  • Coordination Chemistry

Background:

  • Heterometallic coordination polymers offer tunable properties by combining different metal ions.
  • Cluster-based coordination polymers provide well-defined structural units for designing advanced materials.

Purpose of the Study:

  • To synthesize novel heterometallic manganese-iron cluster-based coordination polymers.
  • To investigate the structural diversity and magnetic properties of these new materials.

Main Methods:

  • Reaction of pre-formed mixed-valent manganese(II/III) and iron(III) pivalate clusters.
  • Single-crystal X-ray diffraction for structural elucidation.
  • Magnetic susceptibility measurements and data modeling.

Main Results:

  • Three new heterometallic {Mn(II)Fe(III)(2)} coordination polymers were synthesized: 1D chains (3, 4) and a 2D layer (5).
  • Structural analysis revealed μ(3)-oxo trinuclear pivalate clusters as the core building blocks.
  • Dominant antiferromagnetic interactions were observed between metal centers in all synthesized compounds.

Conclusions:

  • A straightforward synthetic route to heterometallic Mn-Fe cluster-based coordination polymers was established.
  • The structural diversity is influenced by the coordination mode of hexamethylenetetramine (hmta).
  • The magnetic properties are characterized by significant antiferromagnetic coupling, with intercluster interactions playing a crucial role.