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Related Concept Videos

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...
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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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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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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.
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Complexation Equilibria: The Chelate Effect01:19

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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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Oxidation-reduction or redox reactions involve the transfer of electrons from one molecule or atom to another. When an atom gains an electron, another atom must lose an electron, meaning oxidation and reduction must occur together. Since the redox occurs in pairs, the atom that gets oxidized is also called the reducing agent or reductant, and the atom that is reduced is also called the oxidizing agent or oxidant. A straightforward way to remember the definitions of oxidation and reduction is...
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Synthetic Methodology for Asymmetric Ferrocene Derived Bio-conjugate Systems via Solid Phase Resin-based Methodology
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Hexanuclear gold(I) phosphide complexes as platforms for multiple redox-active ferrocenyl units.

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    |December 31, 2013
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    Summary
    This summary is machine-generated.

    New hexanuclear gold(I) complexes with ferrocenyl units were synthesized and studied. These gold clusters show limited electronic communication between ferrocene units, offering insights for molecular battery design.

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    Area of Science:

    • Inorganic Chemistry
    • Organometallic Chemistry
    • Materials Science

    Background:

    • Hexanuclear gold(I) clusters are of interest for their unique structural and electronic properties.
    • Ferrocenyl units are redox-active and can be incorporated into metal clusters.
    • Understanding electronic communication in multi-component molecular systems is crucial for developing advanced materials.

    Purpose of the Study:

    • To synthesize and characterize novel hexanuclear gold(I) μ(3)-ferrocenylmethylphosphido complexes.
    • To investigate the structural impact of different bridging phosphine ligands on these gold clusters.
    • To explore the electrochemical and spectroscopic properties, focusing on electronic communication between ferrocenyl units.

    Main Methods:

    • Synthesis of hexanuclear gold(I) complexes.
    • X-ray crystallography for structural determination.
    • Electrochemical studies (e.g., cyclic voltammetry) to probe redox behavior.
    • Spectroscopic techniques (e.g., NMR, IR) for characterization.

    Main Results:

    • Successful synthesis of a series of hexanuclear gold(I) μ(3)-ferrocenylmethylphosphido complexes with varying phosphine ligands.
    • Structural analysis revealed the influence of different bridging phosphine ligands on cluster architecture.
    • Electrochemical studies indicated one reversible oxidation couple, suggesting a lack of electronic communication between ferrocene units through the gold cluster core.

    Conclusions:

    • The synthesized gold(I) complexes provide a platform for multiple redox-active ferrocenyl units.
    • The absence of electronic communication through the Au(6)P(2) core offers insights into the electronic properties of such clusters.
    • These findings are valuable for designing multi-electron reservoir and molecular battery systems.