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Polymers02:34

Polymers

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Regioselectivity and Stereochemistry of Hydroboration02:36

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A significant aspect of hydroboration–oxidation is the regio- and stereochemical outcome of the reaction.
Hydroboration proceeds in a concerted fashion with the attack of borane on the π bond, giving a cyclic four-centered transition state. The –BH2 group is bonded to the less substituted carbon and –H to the more substituted carbon. The concerted nature requires the simultaneous addition of –H and –BH2 across the same face of the alkene giving syn...
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The polymerization process that involves carbanion as an intermediate is called anionic polymerization. It is also a type of addition or chain-growth polymerization. Anionic polymerization gets initiated by a strong nucleophile such as an organolithium or a Grignard reagent. The most commonly used initiator for anionic polymerization is butyl lithium. Monomers involved in anionic polymerization must possess a vinyl group bonded to one or two electron-withdrawing groups. For instance,...
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Cationic Chain-Growth Polymerization: Mechanism00:57

Cationic Chain-Growth Polymerization: Mechanism

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The cationic polymerization mechanism consists of three steps: initiation, propagation, and termination. In the initiation step of the polymerization process, the π bond of a monomer gets protonated by the Lewis acid catalyst, which is formed from boron trifluoride and water. The protonation of the π bond generates a carbocation stabilized by the electron‐donating group. In the propagation step, the π bond of the second monomer acts as a nucleophile and attacks the...
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Olefin Metathesis Polymerization: Overview01:13

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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...
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Regioselective Formation of Enolates01:33

Regioselective Formation of Enolates

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As depicted in the figure below, the unsymmetrical ketones can form two possible enolates:  less substituted or more substituted enolates. Usually, the thermodynamic enolates are formed from the more substituted α-carbon atom, while the kinetic enolates are formed faster by deprotonation from the less substituted position. The thermodynamic enolates have lower energy, so they are  more stable. But the energy required to form kinetic enolates is less.
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CO2/N2 selectivity with high efficiency using new flexible coordinate organic polymer-based core-shell.

Soheila Sharafinia1, Nedasadat Saadati Ardestani2, Alimorad Rashidi2

  • 1Department of Chemistry, Faculty of Science, Shahid Chamran University of Ahvaz 613578-3151 Ahvaz Iran sharafi.s2014@gmail.com.

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Coordinate organic polymers (COPs) combined with metal-organic frameworks (MOFs) enhance CO2 adsorption and separation. This novel approach significantly boosts CO2 capture capacity and selectivity for sustainable gas management.

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Area of Science:

  • Materials Science
  • Chemistry
  • Environmental Science

Background:

  • Coordinate organic polymers (COPs) and metal-organic frameworks (MOFs) are established porous materials for gas adsorption.
  • Combining COPs and MOFs offers synergistic advantages in adsorption performance, stability, and selectivity for gas separation.
  • Existing materials face limitations in efficiency and cost-effectiveness for carbon capture applications.

Purpose of the Study:

  • To investigate the combined use of COPs and MOFs for enhanced CO2 and N2 adsorption and separation.
  • To synthesize and characterize novel core-shell structures of COP@ZIF-8 for gas adsorption applications.
  • To evaluate the adsorption capacity and selectivity of these novel materials for CO2/N2 mixtures.

Main Methods:

  • Solvothermal synthesis was employed to create COP and COP@ZIF-8 core-shell nanostructures.
  • Comprehensive characterization using techniques including FT-IR, XRD, BET, TEM, SEM, TGA, and XPS.
  • Gas adsorption and separation experiments were conducted to assess performance for CO2/N2 mixtures under various conditions.

Main Results:

  • The COP@ZIF-8 core-shell structure demonstrated a significant increase in CO2 adsorption capacity, rising from 0.209 to 3.425 mmol g-1 at 1 bar and 300.15 K.
  • Adsorption selectivity for CO2/N2 was dramatically improved; COP@ZIF-8 (20% and 30%) showed selectivities of 207.752 and 200.592, respectively, compared to pure COP's 14.824.
  • The synergistic combination of COP and ZIF-8 effectively enhanced the gas adsorption and separation properties.

Conclusions:

  • The developed COP@ZIF-8 core-shell nanostructures represent an efficient and cost-effective advancement in adsorbent technology.
  • This hybrid material approach overcomes limitations of individual components, offering improved performance for CO2 capture and separation.
  • The findings open new avenues for designing sustainable and high-performance porous materials for environmental applications.