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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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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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Complexometric Titration: Ligands00:43

Complexometric Titration: Ligands

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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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EDTA: Chemistry and Properties01:22

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Polydentate ligands are most widely used in complexometric titrations because they form more stable complexes with the metal ions than mono- or bidentate ligands due to the chelate effect. Examples of polydentate ligands are ethylenediaminetetraacetic acid (EDTA), crown ethers, and cryptands. The most important feature of optimal polydentate ligands is the ability to form 1:1 complexes in a single-step process. Amino carboxylic acid derivatives are frequently used as complexing agents. EDTA is...
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Coordination Number and Geometry02:57

Coordination Number and Geometry

20.2K
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.
20.2K
Complexation Equilibria: Factors Influencing Stability of Complexes01:09

Complexation Equilibria: Factors Influencing Stability of Complexes

1.0K
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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Author Spotlight: Experimental Approaches for the Synthesis of Low-Valent Metal-Organic Frameworks from Multitopic Phosphine Linkers
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Macrocyclic phosphazane ligands.

Silvia Gonzalez Calera, Dominic S Wright

    Dalton Transactions (Cambridge, England : 2003)
    |January 9, 2015
    PubMed
    Summary
    This summary is machine-generated.

    Researchers synthesized inorganic macrocycles using phosphorus(III)-nitrogen bonds, similar to organic methods. These novel phosphazane macrocycles offer unique host properties for various guests, paving the way for new inorganic materials.

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    Area of Science:

    • Inorganic Chemistry
    • Supramolecular Chemistry
    • Materials Science

    Background:

    • Inorganic macrocycles offer unique structural and electronic properties.
    • Phosphorus-nitrogen (P-N) bonded frameworks are less explored than organic analogues.
    • Existing synthetic routes for organic macrocycles provide a foundation for inorganic systems.

    Purpose of the Study:

    • To review designed approaches for synthesizing inorganic macrocycles based on P(III)–N bonds.
    • To explore the coordination behavior of these phosphazane macrocycles with diverse guests.
    • To highlight the potential for developing novel inorganic host materials.

    Main Methods:

    • Systematic synthetic routes analogous to organic macrocycle synthesis.
    • Characterization of phosphazane macrocycles' structural and electronic properties.
    • Investigation of coordination with anionic, cationic, and neutral guests.

    Main Results:

    • Successful synthesis of inorganic macrocycles with P(III)–N frameworks.
    • Demonstration of broad coordination behavior with various guest types.
    • Development of organically-soluble host molecules with tailored steric and electronic environments.

    Conclusions:

    • Phosphazane macrocycles represent a versatile class of inorganic host molecules.
    • Designed synthetic strategies enable access to these unique supramolecular structures.
    • Future research can expand the scope of P-N bonded inorganic systems for advanced applications.