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Related Concept Videos

Redox Reactions01:27

Redox Reactions

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Redox reactions are vital biochemical processes that underpin energy metabolism in cells. These reactions involve the transfer of electrons between molecules, occurring in tandem as oxidation and reduction. Oxidation refers to the loss of electrons, while reduction denotes their gain. This coupling ensures the seamless flow of electrons through metabolic pathways. For example, in bacterial metabolism, glucose undergoes oxidation to carbon dioxide, while oxygen is simultaneously reduced to...
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Redox Reactions01:24

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Oxidation-reduction or redox reactions involve the transfer of electrons from one molecule or atom to another. When an atom gains an electron, another atom must lose an electron, meaning oxidation and reduction must occur together. Since the redox occurs in pairs, the atom that gets oxidized is also called the reducing agent or reductant, and the atom that is reduced is also called the oxidizing agent or oxidant. A straightforward way to remember the definitions of oxidation and reduction is...
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Redox Equilibria: Overview01:23

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A reduction-oxidation reaction is commonly called a redox reaction. In a redox reaction, electrons are transferred from one species to another rather than being shared between or among atoms. The reducing agent or reductant is the species that loses electrons and gets oxidized in the process. The species that gains electrons and gets reduced in the process is the oxidizing agent or oxidant. Redox reactions are represented as two separate equations called half-reactions, where one equation...
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Thermal and Photochemical Electrocyclic Reactions: Overview01:26

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Electrocyclic reactions are reversible reactions. They involve an intramolecular cyclization or ring-opening of a conjugated polyene. Shown below are two examples of electrocyclic reactions. In the first reaction, the formation of the cyclic product is favored. In contrast, in the second reaction, ring-opening is favored due to the high ring strain associated with cyclobutene formation.
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Oxidation and Reduction of Organic Molecules01:19

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Energy production within a cell involves many coordinated chemical pathways. Most of these pathways are combinations of oxidation and reduction reactions, which occur at the same time. An oxidation reaction strips an electron from an atom in a compound, and the addition of this electron to another compound is a reduction reaction. Because oxidation and reduction usually occur together, these pairs of reactions are called redox reactions.
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Crystal Field Theory - Octahedral Complexes02:58

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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.
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Redox-triggered switching in three-dimensional covalent organic frameworks.

Chao Gao1, Jian Li2,3, Sheng Yin1

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Researchers developed a switchable three-dimensional covalent organic framework (3D COF). This material reversibly transforms via redox reactions, enabling tunable gas separation properties and stimuli-responsive behavior.

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Area of Science:

  • Materials Science
  • Chemistry

Background:

  • Stimuli-responsive materials are gaining interest for advanced applications.
  • Molecular switches in solid-state materials offer tunable properties.

Purpose of the Study:

  • To report a novel switchable three-dimensional covalent organic framework (3D COF).
  • To demonstrate the tunable gas separation properties of the 3D COF through redox-triggered transformations.

Main Methods:

  • Synthesis of a 3D COF capable of reversible hydroquinone/quinone redox reactions.
  • Characterization of the COF's structural integrity, porosity, and switching behavior.
  • Evaluation of gas separation properties before and after redox switching.

Main Results:

  • The 3D COF exhibited a reversible transformation via redox reactions, maintaining crystallinity and porosity.
  • The switching process occurred gradually throughout the framework with high conversion yields.
  • Redox-triggered transformation altered pore surface functional groups and channel shapes, leading to tunable gas separation.

Conclusions:

  • 3D COFs serve as robust platforms for tuning molecular switches in the solid state.
  • Switching moieties within 3D COFs significantly modify the pore environment.
  • This modification enables the development of materials with unique stimuli-responsive properties.