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Crystal Field Theory - Octahedral Complexes02:58

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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.
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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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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.
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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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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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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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Author Spotlight: Functionalizing Metal-Organic Frameworks: Advancements, Challenges, and the Power of Post-Synthetic Ligand Exchange
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Correction to "Ligand Chromophore Modification Approach for Predictive Incremental Tuning of Metal-Organic Framework

Zoe M Soilis, Tae Hoon Choi, Joe Brennan

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    This study corrects a previously published article DOI. The correction ensures accurate citation and referencing for scientific research. Ensuring data integrity is crucial for reproducible science.

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    Area of Science:

    • Materials Science
    • Chemical Engineering

    Context:

    • Correction of a previously published article DOI.
    • Ensuring accurate citation and referencing.

    Purpose:

    • To provide the correct article DOI for proper attribution.
    • To maintain the integrity of scientific literature.

    Summary:

    • This entry serves as a correction notice for the article with DOI 10.1021/acs.chemmater.3c01603.
    • The correction ensures that all references and citations accurately point to the intended research.

    Impact:

    • Facilitates accurate retrieval of scientific information.
    • Upholds the standards of scientific publishing and record-keeping.
    • Prevents misinformation and aids future research referencing.