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Related Concept Videos

Properties of Organometallic Compounds01:23

Properties of Organometallic Compounds

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.
Olefin Metathesis Polymerization: Overview01:13

Olefin Metathesis Polymerization: Overview

Recently, the development of olefin metathesis polymerization advanced the field of polymer synthesis. Simply put, the reorganization of substituents on their double bonds between two olefins in the presence of a catalyst is known as the olefin metathesis reaction. The use of metathesis reaction for polymer synthesis is called olefin metathesis polymerization.
Ruthenium-based Grubbs catalyst is the most commonly used catalyst for olefin metathesis polymerization. Grubbs catalyst consists of a...
Olefin Metathesis Polymerization: Ring-Opening Metathesis Polymerization (ROMP)01:16

Olefin Metathesis Polymerization: Ring-Opening Metathesis Polymerization (ROMP)

Ring-opening metathesis polymerization or ROMP involves strained cycloalkenes as starting materials. The mechanism of ROMP proceeds by reacting cycloalkene with Grubbs catalyst to give metallacyclobutane intermediate which undergoes a ring-opening reaction to form new carbene. The new carbene reacts with another molecule of cycloalkene. Repetition of these steps leads to the formation of an unsaturated open-chain polymer product. All these steps are reversible, however, relieving the ring...
Properties of Transition Metals02:58

Properties of Transition Metals

Transition metals are defined as those elements that have partially filled d orbitals. As shown in Figure 1, the d-block elements in groups 3–12 are transition elements. The f-block elements, also called inner transition metals (the lanthanides and actinides), also meet this criterion because the d orbital is partially occupied before the f orbitals.
EDTA: Chemistry and Properties01:22

EDTA: Chemistry and Properties

Polydentate ligands are most widely used in complexometric titrations because they form more stable complexes with the metal ions than mono- or bidentate ligands due to the chelate effect. Examples of polydentate ligands are ethylenediaminetetraacetic acid (EDTA), crown ethers, and cryptands. The most important feature of optimal polydentate ligands is the ability to form 1:1 complexes in a single-step process. Amino carboxylic acid derivatives are frequently used as complexing agents. EDTA is...
Olefin Metathesis Polymerization: Acyclic Diene Metathesis (ADMET)00:53

Olefin Metathesis Polymerization: Acyclic Diene Metathesis (ADMET)

Acyclic diene metathesis polymerization or ADMET polymerization involves cross-metathesis of terminal dienes, such as 1,8-nonadiene, to give linear unsaturated polymer and ethylene. As ADMET is a reversible process, the formed ethylene gas must be removed from the reaction mixture to complete the polymerization process.
Similar to cross-metathesis, ADMET also involves the formation of metallacyclobutane intermediate by [2+2] cycloaddition of one of the double bonds of a terminal diene with...

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Preparation of Polyoxometalate-based Photo-responsive Membranes for the Photo-activation of Manganese Oxide Catalysts
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Engineering polyoxometalates with emergent properties.

Haralampos N Miras1, Jun Yan, De-Liang Long

  • 1WestCHEM, School of Chemistry, University of Glasgow, Glasgow, G12 8QQ, UK.

Chemical Society Reviews
|August 4, 2012
PubMed
Summary
This summary is machine-generated.

Polyoxometalates, large nanoscale metal-oxide clusters, offer diverse engineered properties. Building block libraries enable construction of catalytic, electronic, and structural systems with emergent processes.

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Area of Science:

  • Materials Science
  • Nanotechnology
  • Chemistry

Background:

  • Polyoxometalates are large, structurally diverse nanoscale metal-oxide clusters.
  • They represent some of the largest structurally characterized non-biological molecules.
  • These clusters possess a wide range of tunable physical properties.

Purpose of the Study:

  • To demonstrate the use of polyoxometalate building block libraries for constructing functional systems.
  • To explore the creation of systems with specific catalytic, electronic, and structural properties.
  • To investigate the construction of complex chemical systems exhibiting emergent processes.

Main Methods:

  • Utilizing libraries of polyoxometalate building blocks.
  • Engineering specific physical and chemical properties through molecular design.
  • Manipulating templating and self-templating rules for system construction.

Main Results:

  • Successful construction of systems with tailored catalytic, electronic, and structural functionalities.
  • Demonstration of emergent processes from molecular to macroscopic scales.
  • Highlighting the versatility of polyoxometalates in advanced material design.

Conclusions:

  • Polyoxometalate building block libraries are effective for creating advanced functional materials.
  • The ability to engineer properties and control self-assembly leads to complex emergent behaviors.
  • Polyoxometalates offer a powerful platform for developing novel catalytic, electronic, and structural systems.