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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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Structural Isomerism02:34

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Isomerism in Complexes
Isomers are different chemical species that have the same chemical formula. Structural isomerism of coordination compounds can be divided into two subcategories, the linkage isomers and coordination-sphere isomers.
Linkage isomers occur when the coordination compound contains a ligand that can bind to the transition metal center through two different atoms. For example, the CN− ligand can bind through the carbon atom or through the nitrogen atom. Similarly, SCN− can...
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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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Coordination Number and Geometry02:57

Coordination Number and Geometry

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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.
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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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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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Redox- and metal-directed structural diversification in designed metalloprotein assemblies.

Albert Kakkis1, Eyal Golub1, Tae Su Choi1

  • 1Department of Chemistry and Biochemistry, University of California, San Diego, 9500 Gilman Drive, La Jolla, CA, 92093, USA. tezcan@ucsd.edu.

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This study introduces a novel protein building block that changes its assembly based on redox state and metal ions. This single block can form five different structures, showcasing responsive protein architecture design.

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Area of Science:

  • Protein engineering
  • Biophysical chemistry
  • Materials science

Background:

  • Designing protein building blocks for controlled self-assembly is crucial for creating novel biomaterials.
  • Understanding the interplay of different interaction types (hydrophobic, metal-ligand, covalent) is key to predicting and controlling protein assembly.

Purpose of the Study:

  • To design and characterize a protein building block with dual gating mechanisms for self-assembly.
  • To demonstrate the ability of a single protein construct to form multiple, distinct oligomeric states.
  • To explore the use of redox state and metal ion identity as external triggers for protein architecture control.

Main Methods:

  • Protein design and synthesis.
  • Structural characterization (e.g., X-ray crystallography, NMR spectroscopy).
  • Biophysical characterization (e.g., dynamic light scattering, isothermal titration calorimetry).

Main Results:

  • A designed protein building block was created with self-assembly controlled by disulfide bond redox state and metal ion identity.
  • The protein construct was shown to access five distinct oligomeric states.
  • Extensive structural and biophysical data confirmed the responsive nature of the protein architectures.

Conclusions:

  • A single protein building block can yield multiple, responsive architectures by harnessing combined interaction types.
  • Dual gating mechanisms (redox and metal ions) offer precise control over protein self-assembly.
  • This work provides a framework for designing complex, stimulus-responsive protein-based materials.