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Related Concept Videos

Properties of Organometallic Compounds01:23

Properties of Organometallic Compounds

1.4K
Organometallic compounds are compounds that contain a carbon–metal bond. Carbon belongs to an organyl group like alkyl, aryl, allyl, or benzyl groups. The metal can be from Group I or Group II of the periodic table, a transition metal, or a semimetal.
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Complexometric Titration: Ligands00:43

Complexometric Titration: Ligands

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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...
2.0K
Complexometric Titration: Overview00:39

Complexometric Titration: Overview

10.1K
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...
10.1K
Extraction: Advanced Methods00:56

Extraction: Advanced Methods

877
Metal ions can be separated from one another by complexation with organic ligands–the chelating agent– to form uncharged chelates. Here, the chelating agent must contain hydrophobic groups and behave as a weak acid, losing a proton to bind with the metal. Since most organic ligands used in this process are insoluble or undergo oxidation in the aqueous phase, the chelating agent is initially added to the organic phase and extracted into the aqueous phase. The metal-ligand complex is...
877
Qualitative Analysis03:46

Qualitative Analysis

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For solutions containing mixtures of different cations, the identity of each cation can be determined by qualitative analysis. This technique involves a series of selective precipitations with different chemical reagents, each reaction producing a characteristic precipitate for a specific group of cations. Metal ions within a group are further separated by varying the pH, heating the mixture to redissolve a precipitate, or adding other reagents to form complex ions.
For instance, group IV...
23.3K
Oxidation of Alkenes: Syn Dihydroxylation with Potassium Permanganate02:21

Oxidation of Alkenes: Syn Dihydroxylation with Potassium Permanganate

15.4K
Alkenes can be dihydroxylated using potassium permanganate.  The method encompasses the reaction of an alkene with a cold, dilute solution of potassium permanganate under basic conditions to form a cis-diol along with a brown precipitate of manganese dioxide.
15.4K

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High Resolution Physical Characterization of Single Metallic Nanoparticles
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High Resolution Physical Characterization of Single Metallic Nanoparticles

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Polyoxometalates in Analytical Sciences.

Tadaharu Ueda1,2

  • 1Department of Marine Resource Science Faculty of Agriculture and Marine Science, Kochi University, Nankoku, 783-8502, Japan. chuji@kochi-u.ac.jp.

Analytical Sciences : the International Journal of the Japan Society for Analytical Chemistry
|November 9, 2020
PubMed
Summary
This summary is machine-generated.

Polyoxometalates (POMs) offer versatile analytical applications. Their redox activity and fluorescence enable sensitive detection methods, expanding beyond traditional spectrophotometry.

Keywords:
Polyoxometalatescatalytic waveelectrochemistrymodified electrodespectrophotometry

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Preparation of Polyoxometalate-based Photo-responsive Membranes for the Photo-activation of Manganese Oxide Catalysts
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Preparation of Highly Porous Coordination Polymer Coatings on Macroporous Polymer Monoliths for Enhanced Enrichment of Phosphopeptides
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Preparation of Polyoxometalate-based Photo-responsive Membranes for the Photo-activation of Manganese Oxide Catalysts
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Area of Science:

  • Inorganic Chemistry
  • Analytical Chemistry
  • Materials Science

Background:

  • Polyoxometalates (POMs) are versatile inorganic compounds with unique redox and optical properties.
  • Traditional applications include spectrophotometric determination of silicon and phosphorus (molybdenum yellow and blue methods).
  • Recent research explores advanced analytical applications beyond these established methods.

Purpose of the Study:

  • To review recent analytical applications of Polyoxometalates (POMs) published after 2000.
  • To highlight the use of POMs in electrochemical and fluorescence-based sensing.
  • To showcase the potential of POMs as mediators and signaling units in analytical chemistry.

Main Methods:

  • Literature review focusing on papers published after 2000.
  • Analysis of POMs' redox activity for electrochemical sensing.
  • Investigation of fluorescence properties of rare-earth-metal-incorporated POMs for detection.

Main Results:

  • POMs exhibit complex, reversible voltammetric responses due to their redox activity.
  • POMs act as effective electron mediators in catalytic electrochemical reactions, enabling sensitive determinations.
  • Rare-earth-metal-doped POMs show fluorescence, allowing for sensitive detection via intensity modulation.

Conclusions:

  • Polyoxometalates (POMs) offer advanced analytical capabilities beyond traditional spectrophotometry.
  • Their redox and fluorescence properties are key to developing sensitive electrochemical and optical sensors.
  • POMs are promising materials for future analytical methodologies.