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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 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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Complexometric titration involves the formation of a complex by reacting a metal ion with one or more ligands. A visual indicator often detects the end point of a complexometric titration. It is added to the metal solution before the titration, forming a stable metal–indicator complex and imparting color to the solution. As the titration approaches the equivalence point, the excess of the added ligand displaces the indicator from the metal–indicator complex, releasing the free...
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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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Spontaneous Chemical Reactions
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Besides iodine, other oxidizing or reducing agents can serve as titrants in redox titrations. Common oxidizing titrants include KMnO4, cerium(IV), and K2Cr2O7. The choice of oxidizing titrants depends on factors like stability, cost, analyte strength, and reaction rate between the analyte and titrant. KMnO4 is a strong oxidizing titrant that reduces from Mn(VII) to Mn(II) in a highly acidic solution, simultaneously oxidizing the analyte to a higher oxidation state. In this case, KMnO4 acts as a...
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Preparation of Polyoxometalate-based Photo-responsive Membranes for the Photo-activation of Manganese Oxide Catalysts
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A Multi-Redox Responsive Cyanometalate-Based Metallogel.

Kiyotaka Mitsumoto1, Jamie M Cameron1, Rong-Jia Wei1

  • 1Graduate School of Pure and Applied Sciences, University of Tsukuba, Tennodai 1-1-1, Tsukuba, 305-8571, Japan.

Chemistry (Weinheim an Der Bergstrasse, Germany)
|December 6, 2016
PubMed
Summary
This summary is machine-generated.

Researchers developed a novel multi-redox active gelator using a tetrathiafulvalene-based ligand and a mixed-metal complex. This complex exhibits thermoreversible gelation and undergoes reversible gel-to-sol transitions upon electrochemical stimuli.

Keywords:
cyanometalateredox activesol-gelstimuli-responsive materialssupramolecular chemistry

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Area of Science:

  • Supramolecular Chemistry
  • Materials Science
  • Coordination Chemistry

Background:

  • Tetrathiafulvalene (TTF) derivatives are known for their redox activity.
  • Multi-redox active complexes offer tunable electronic properties.
  • Gelators are molecules that can form self-assembled networks in solution.

Purpose of the Study:

  • To synthesize a novel TTF-based tridentate ligand with long alkyl chains.
  • To construct a new multi-redox active gelator based on a mixed-metal octanuclear complex.
  • To investigate the gelation, magnetic, and electrochemical properties of the complex.

Main Methods:

  • Synthesis of a TTF-based tridentate ligand.
  • Preparation of a mixed-metal octanuclear complex incorporating the ligand.
  • Characterization of magnetic, electrochemical, and gelation properties.
  • Investigation of stimuli-responsive gel-to-sol transitions.

Main Results:

  • A novel TTF-based ligand (L) and a mixed-metal octanuclear complex [Fe4Ni4(CN)12(tp)4(L)4](BF4)4 (1) were successfully synthesized.
  • Complex 1 exhibits thermoreversible gelation in 1,2-dichlorobenzene at room temperature.
  • The gel phase of complex 1 undergoes reversible gel-to-sol transformations upon electrochemical oxidation or reduction.

Conclusions:

  • The synthesized TTF-based ligand enables the formation of multi-redox active gelators.
  • The mixed-metal complex demonstrates tunable supramolecular behavior responsive to redox stimuli.
  • This work presents a new class of stimuli-responsive materials with potential applications in molecular electronics or sensing.