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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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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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Coordination Compounds and Nomenclature02:54

Coordination Compounds and Nomenclature

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In most main group element compounds, the valence electrons of the isolated atoms combine to form chemical bonds that satisfy the octet rule. For instance, the four valence electrons of carbon overlap with electrons from four hydrogen atoms to form CH4. The one valence electron leaves sodium and adds to the seven valence electrons of chlorine to form the ionic formula unit NaCl (Figure 1a). Transition metals do not normally bond in this fashion. They primarily form coordinate covalent bonds, a...
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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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Ligand Binding Sites02:40

Ligand Binding Sites

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Proteins are dynamic macromolecules that carry out a wide variety of essential processes; however, the activities of most proteins depend on their interactions with other molecules or ions, known as ligands.
Protein-ligand interactions are quite specific; even though numerous potential ligands surround a cellular protein at any given time, only a particular ligand can bind to that protein. Moreover, a ligand binds only to a dedicated area on the surface of the protein, known as the...
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Ligand Binding and Linkage00:49

Ligand Binding and Linkage

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Allosteric proteins have more than one ligand binding site; the binding of a ligand to any of these sites influences the binding of ligands to the other sites. When a protein is allosteric, its binding sites are called coupled or linked.  In the case of enzymes, the site that binds to the substrate is known as the active site and the other site is known as the regulatory site. When a ligand binds to the regulatory site, this leads to conformational changes in the protein that can influence...
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Author Spotlight: Functionalizing Metal-Organic Frameworks: Advancements, Challenges, and the Power of Post-Synthetic Ligand Exchange
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Reconfiguring surface functions using visible-light-controlled metal-ligand coordination.

Chaoming Xie1,2, Wen Sun2, Hao Lu2

  • 1Institute of Fundamental and Frontier Sciences, University of Electronic Science and Technology of China, 610054, Chengdu, China.

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|September 23, 2018
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Summary
This summary is machine-generated.

Researchers developed reconfigurable surfaces using visible-light-controlled chemistry. This allows surfaces to change functions on demand by swapping molecular ligands, enabling adaptable material applications.

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Area of Science:

  • Materials Science
  • Surface Chemistry
  • Photochemistry

Background:

  • Traditional surfaces are static or have limited "on"/"off" states.
  • Developing adaptable surfaces for dynamic environments remains a challenge.

Purpose of the Study:

  • To create reconfigurable surfaces with user-defined functions.
  • To utilize visible-light-controlled coordination chemistry for surface modification.

Main Methods:

  • Substrates were modified with a Ruthenium (Ru) complex (Ru-H2O).
  • Functional thioether ligands were immobilized via Ru-thioether coordination.
  • Visible light induced ligand dissociation to remove and replace thioethers, altering surface function.

Main Results:

  • Demonstrated reconfigurable surfaces with tunable properties.
  • Successfully altered surface patterns, protein adsorption, and wettability.
  • Showcased the ability to customize surface functions on demand.

Conclusions:

  • Visible-light-controlled Ru-thioether chemistry enables the fabrication of reconfigurable surfaces.
  • This strategy offers a versatile platform for creating adaptable materials with customizable functions.