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Related Concept Videos

Formation of Complex Ions03:45

Formation of Complex Ions

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A type of Lewis acid-base chemistry involves the formation of a complex ion (or a coordination complex) comprising a central atom, typically a transition metal cation, surrounded by ions or molecules called ligands. These ligands can be neutral molecules like H2O or NH3, or ions such as CN− or OH−. Often, the ligands act as Lewis bases, donating a pair of electrons to the central atom. These types of Lewis acid-base reactions are examples of a broad subdiscipline called coordination...
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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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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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Complexation Equilibria: The Chelate Effect01:19

Complexation Equilibria: The Chelate Effect

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In complexation reactions, metal atoms or cations interact with ligands to form donor-acceptor adducts called metal complexes. Ligands that bind through one donor site are monodentate, ligands with two donor sites are bidentate, and those with more than two donor sites are polydentate ligands. For example, ethylene diamine is a bidentate ligand that binds through two nitrogen donor atoms, forming a five-membered ring. EDTA is a polydentate ligand that binds through four oxygen and two nitrogen...
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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...
25.7K
Complexation Equilibria: Factors Influencing Stability of Complexes01:09

Complexation Equilibria: Factors Influencing Stability of Complexes

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In complexation reactions, metal cations are the electron pair acceptors, and the ligands are the electron pair donors. The stability of the metal complexes depends primarily on the complexing ability of the central metal ion and the nature of the ligands. Generally, the complexing ability of the metal ion depends on the size and charge of the ion. As the metal ion size increases, the stability of the metal complexes decreases, provided that the valency of the metal ion and the ligands remain...
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Related Experiment Video

Updated: Apr 9, 2026

Stable Aqueous Suspensions of Manganese Ferrite Clusters with Tunable Nanoscale Dimension and Composition
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Two new mononuclear manganese(III) salen complexes.

Sabina Grabner, Peter Bukovec, Nina Lah

    Acta Chimica Slovenica
    |June 19, 2015
    PubMed
    Summary

    Two novel manganese(III)-salen complexes incorporating 4-aminopyridine (4-apy) were synthesized and characterized. These complexes exhibit distinct structures, including mononuclear and ionic forms, with octahedral coordination around the manganese centers.

    Area of Science:

    • Coordination Chemistry
    • Materials Science

    Background:

    • Manganese complexes, particularly salen derivatives, are widely studied for their diverse applications.
    • 4-aminopyridine (4-apy) is a versatile ligand in coordination chemistry.

    Purpose of the Study:

    • To synthesize and structurally characterize two new manganese(III)-salen complexes featuring 4-aminopyridine.
    • To investigate the coordination environment and structural properties of these novel complexes.

    Main Methods:

    • Synthesis of manganese(III)-salen complexes.
    • Single-crystal X-ray diffraction for structural elucidation.
    • Spectroscopic characterization.

    Main Results:

    • Two new complexes, [Mn(ac)(4-apy)(sal)] (1) and [Mn(4-apy)2(sal)]PF6 (2), were successfully prepared.

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    Combining Solid-state and Solution-based Techniques: Synthesis and Reactivity of ChalcogenidoplumbatesII or IV
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    Combining Solid-state and Solution-based Techniques: Synthesis and Reactivity of ChalcogenidoplumbatesII or IV
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  • Complex 1 exhibits a mononuclear structure with octahedral geometry around Mn(III).
  • Complex 2 is an ionic compound with octahedral coordination, forming zig-zag chains via hydrogen bonds.

    • Conclusions:

    • The study successfully synthesized and characterized two novel Mn(III)-salen complexes with 4-apy.
    • The structural diversity, including mononuclear and ionic forms, highlights the versatility of these complexes.
    • The findings contribute to the understanding of manganese coordination chemistry and material properties.