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Related Concept Videos

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...
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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 eye.
Complexometric Titration: Ligands00:43

Complexometric Titration: Ligands

Different monodentate and polydentate ligands are used as complexing agents in complexometric titration reactions. The formation of complexes by mono- and bidentate ligands involves two or more intermediate steps, limiting their use as complexing agents. In comparison, polydentate ligands can form complexes with metal ions in a single-step process, facilitating sharper end points. This means polydentate ligands, such as amino carboxylic acid derivatives, are most commonly employed in...

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Related Experiment Video

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Facet-to-facet Linking of Shape-anisotropic Colloidal Cadmium Chalcogenide Nanostructures
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Published on: August 10, 2017

Poly[aqua(μ-vinyl-phospho-nato)cadmium].

Laura K Byington Congiardo, Joel T Mague, Aaron R Funk

    Acta Crystallographica. Section E, Structure Reports Online
    |July 15, 2011
    PubMed
    Summary

    This study details a new cadmium coordination polymer derived from vinyl-phosphonic acid. The structure features a distorted octahedral cadmium ion, highlighting the compound's unique bonding and layered arrangement.

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    Area of Science:

    • Coordination chemistry
    • Materials science
    • Crystallography

    Background:

    • Vinyl-phosphonic acid is a versatile ligand in coordination chemistry.
    • Cadmium-based coordination polymers exhibit diverse structural motifs and properties.
    • Understanding the synthesis and structure of novel coordination compounds is crucial for materials development.

    Purpose of the Study:

    • To synthesize and characterize a novel coordination polymer of cadmium with vinyl-phosphonic acid.
    • To elucidate the crystal structure and coordination environment of the cadmium ion.
    • To investigate the intermolecular interactions within the crystal lattice.

    Main Methods:

    • Single-crystal X-ray diffraction was employed to determine the crystal structure.
    • The compound was synthesized via a reaction between vinyl-phosphonic acid and cadmium nitrate.
    • Structural analysis included bond length, bond angle, and hydrogen bonding analysis.

    Main Results:

    • A novel coordination polymer, [Cd(C(2)H(3)O(3)P)(H(2)O)](n), was successfully synthesized.
    • The cadmium ion is six-coordinate with a distorted octahedral geometry.
    • The structure is characterized by layered sheets held together by van der Waals forces, with vinyl groups extending into the inter-lamellar space.

    Conclusions:

    • The synthesized compound represents a new example of cadmium coordination polymers with vinyl-phosphonic acid.
    • The distorted octahedral coordination of cadmium and the hydrogen bonding interactions play key roles in stabilizing the crystal structure.
    • The structural features suggest potential for applications in areas requiring specific layered materials.