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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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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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Extraction: Advanced Methods00:56

Extraction: Advanced Methods

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Metal ions can be separated from one another by complexation with organic ligands–the chelating agent– to form uncharged chelates. Here, the chelating agent must contain hydrophobic groups and behave as a weak acid, losing a proton to bind with the metal. Since most organic ligands used in this process are insoluble or undergo oxidation in the aqueous phase, the chelating agent is initially added to the organic phase and extracted into the aqueous phase. The metal-ligand complex is...
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Complexation Equilibria: Factors Influencing Stability of Complexes01:09

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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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Bonding in Metals02:32

Bonding in Metals

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Metallic bonds are formed between two metal atoms. A simplified model to describe metallic bonding has been developed by Paul Drüde called the “Electron Sea Model”. 
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Ion Mobility-Mass Spectrometry Techniques for Determining the Structure and Mechanisms of Metal Ion Recognition and Redox Activity of Metal Binding Oligopeptides
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DNA-bound metal ions: recent developments.

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    Metal ions interact with DNA due to its charged structure. This review covers DNA-metal ion binding, its role in health and disease, and applications in nanotechnology and sensors.

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    Area of Science:

    • Biochemistry
    • Molecular Biology
    • Nanotechnology

    Background:

    • DNA's structure, featuring a negatively charged phosphate backbone and nucleobases with O and N atoms, facilitates metal ion interactions.
    • DNA-metal ion binding is a broad research area with implications for fundamental science, disease mechanisms, and human health.
    • Metal ion coordination influences DNA structure and function, enabling applications in molecular devices and sensors.

    Purpose of the Study:

    • To review recent advances in understanding redox-active metal ion interactions with DNA.
    • To explore the mechanisms of oxidative DNA damage induced by metal ions.
    • To highlight applications of DNA-metal ion interactions in sensing and nanotechnology.

    Main Methods:

    • Literature review of recent research on DNA-metal ion interactions.
    • Analysis of studies on oxidative DNA damage mechanisms.
    • Examination of research on metal-mediated DNA base pairing and its applications.

    Main Results:

    • Redox-active metal ions contribute to oxidative DNA damage, including strand breakage and base modifications.
    • Antioxidants can mitigate this damage by coordinating metal ions.
    • DNA-metal ion interactions affect the efficacy of antibacterial drugs like quinolones.
    • Metal-mediated base pairing enables DNA conformational changes for selective metal ion sensing and nanotechnology.

    Conclusions:

    • Understanding DNA-metal ion interactions is crucial for elucidating oxidative damage pathways and developing therapeutic strategies.
    • Metal-mediated DNA modifications offer novel avenues for creating advanced sensors and nanotechnology applications.
    • Further research into DNA-metal ion binding can lead to breakthroughs in medicine and materials science.