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Related Concept Videos

Ionic Crystal Structures02:42

Ionic Crystal Structures

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Ionic crystals consist of two or more different kinds of ions that usually have different sizes. The packing of these ions into a crystal structure is more complex than the packing of metal atoms that are the same size.
Most monatomic ions behave as charged spheres, and their attraction for ions of opposite charge is the same in every direction. Consequently, stable structures for ionic compounds result (1) when ions of one charge are surrounded by as many ions as possible of the opposite...
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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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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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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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Metallic Solids02:37

Metallic Solids

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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.
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Crystal Field Theory - Octahedral Complexes02:58

Crystal Field Theory - Octahedral Complexes

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Crystal Field Theory
To explain the observed behavior of transition metal complexes (such as colors), a model involving electrostatic interactions between the electrons from the ligands and the electrons in the unhybridized d orbitals of the central metal atom has been developed. This electrostatic model is crystal field theory (CFT). It helps to understand, interpret, and predict the colors, magnetic behavior, and some structures of coordination compounds of transition metals.
CFT focuses on...
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Combining Solid-state and Solution-based Techniques: Synthesis and Reactivity of ChalcogenidoplumbatesII or IV
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Solid State Structures of Lead Complexes with Relevance for Biological Systems.

Katsuyuki Aoki, Kazutaka Murayama, Ning-Hai Hu

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    Structural insights into lead ion interactions with biological molecules are crucial for understanding lead poisoning and developing treatments. This review details lead

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    Area of Science:

    • Coordination Chemistry
    • Structural Biology
    • Toxicology

    Background:

    • Lead poisoning remains a significant global health concern.
    • Understanding lead ion interactions with biological molecules is key to developing effective treatments.
    • Coordination chemistry of lead requires further structural elucidation.

    Purpose of the Study:

    • To provide structural data on lead complexes with biorelevant molecules.
    • To detail metal binding sites and modes in lead-biomolecule interactions.
    • To compile structural information for therapeutic development against lead poisoning.

    Main Methods:

    • Analysis of crystal structures from the Cambridge Structural Database (CSD).
    • Examination of structures from the Protein Data Bank (PDB).
    • Focus on lead complexes with diverse biorelevant ligands.

    Main Results:

    • Compilation of structural data for lead complexes with amino acids, peptides, proteins, nucleic acid constituents, nucleic acids, saccharides, and detoxification agents.
    • Description of metal coordination environments and structural characteristics for representative complexes.
    • Identification of key binding sites and modes in lead-biomolecule interactions.

    Conclusions:

    • Structural data provides fundamental insights into lead ion interactions with biological systems.
    • This information is vital for advancing the coordination chemistry of lead.
    • Findings contribute to the development of strategies for treating lead poisoning.