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Related Concept Videos

Acidity of 1-Alkynes02:42

Acidity of 1-Alkynes

9.9K

The acidic strength of hydrocarbons follows the order: Alkynes > Alkenes > Alkanes. The strength of an acid is commonly expressed in units of pKa — the lower the pKa, the stronger the acid. Among the hydrocarbons, terminal alkynes have lower pKa values and are, therefore, more acidic. For example, the pKa values for ethane, ethene, and acetylene are 51, 44, and 25, respectively, as shown here.
9.9K
Molecular Structure and Acidity02:34

Molecular Structure and Acidity

17.4K
An acid can be deprotonated to form a conjugate base or an anion. If the produced anion is more stable, then the acid is stronger. On the contrary, if the anion is unstable, then the acid is weaker. Hence, to determine the acidity of the compound, the stability of its conjugate base is studied using various factors.
The size effect explains the change in atomic size on acidity. When comparing the acids formed from elements that belong to the same column in the periodic table, their atomic sizes...
17.4K
Acid-Catalyzed Hydration of Alkenes02:45

Acid-Catalyzed Hydration of Alkenes

14.4K
Alkenes react with water in the presence of an acid to form an alcohol. In the absence of acid, hydration of alkenes does not occur at a significant rate, and the acid is not consumed in the reaction. Therefore, alkene hydration is an acid-catalyzed reaction.
14.4K
Basicity of Heterocyclic Aromatic Amines01:25

Basicity of Heterocyclic Aromatic Amines

6.1K
Heterocyclic amines, where the N atom is a part of an alicyclic system, are similar in basicity to alkylamines. Interestingly, the heterocyclic amine having a nitrogen atom as part of an aromatic ring has much less basicity than its corresponding alicyclic counterpart. For this reason, as presented in Figure 1, piperidine (pKb = 2.8) is significantly more basic than pyridine (pKb = 8.8).
6.1K
Acid Halides to Carboxylic Acids: Hydrolysis01:01

Acid Halides to Carboxylic Acids: Hydrolysis

2.8K
Hydrolysis of acid halides is a nucleophilic acyl substitution reaction in which acid halides react with water to give carboxylic acids. The reaction occurs readily and does not require acid or a base catalyst.
As shown below, the mechanism involves a nucleophilic attack by water at the carbonyl carbon to form a tetrahedral intermediate. This is followed by the reformation of the carbon–oxygen π bond along with the departure of a halide ion. A final proton transfer step yields carboxylic...
2.8K
Leveling Effect01:29

Leveling Effect

841
In acid-base chemistry, the leveling effect refers to the limitation imposed by the solvent on the strength of acids and bases in solution. When a base stronger than the solvent's conjugate base is used, it deprotonates the solvent until the base is entirely consumed, making it ineffective against weaker acids. Conversely, an acid stronger than the solvent's conjugate acid protonates the solvent until the acid is depleted, rendering it ineffective against weaker bases. Essentially, the...
841

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Synthesis of Zeolites Using the ADOR Assembly-Disassembly-Organization-Reassembly Route
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Synthesis of Zeolites Using the ADOR Assembly-Disassembly-Organization-Reassembly Route

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Acidity: A Key Parameter in Zeolite-Templated Carbon Formation.

Thibaud Aumond1, Hervé Vezin2, Isabelle Batonneau-Gener1

  • 1Institut de Chimie des Milieux et Matériaux de Poitiers (IC2MP), Université de Poitiers-UMR 7285 CNRS, 4 rue Michel Brunet, TSA 51106, 86073 Cedex 9, Poitiers, France.

Small (Weinheim an Der Bergstrasse, Germany)
|June 28, 2023
PubMed
Summary

Zeolite acidity critically influences zeolite-templated carbon (ZTC) synthesis. Higher acid site concentration enhances spin concentration and electrical conductivity, key indicators of ZTC quality.

Keywords:
acidityelectrical conductivityspin concentrationzeolite-templated carbonzeolites

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Area of Science:

  • Materials Science
  • Nanotechnology
  • Carbon Materials

Background:

  • Zeolite-templated carbons (ZTCs) are advanced carbon materials synthesized using zeolites as templates.
  • The synthesis conditions significantly influence the properties of ZTCs, including their electrical conductivity and structural characteristics.

Purpose of the Study:

  • To investigate the impact of zeolite acidity on the synthesis and properties of ZTCs.
  • To establish a correlation between zeolite acid sites, spin concentration, and electrical conductivity in hybrid materials and resulting ZTCs.

Main Methods:

  • Synthesis of ZTCs using zeolites with varying acid site concentrations.
  • Characterization of textural, chemical, and spin properties of the synthesized hybrid materials and ZTCs.
  • Measurement of electrical conductivity of the resulting carbon materials.

Main Results:

  • Zeolite acidity was found to be crucial for ZTC synthesis, independent of textural and chemical properties at a fixed temperature.
  • Spin concentration in hybrid materials strongly correlates with zeolite acid site concentration.
  • Electrical conductivity of hybrid materials and ZTCs is directly related to spin concentration, spanning four orders of magnitude.

Conclusions:

  • Zeolite acid site concentration is a fundamental factor controlling the electrical conductivity of ZTCs.
  • Electrical conductivity serves as a key parameter for evaluating the quality of ZTCs.
  • Understanding the role of zeolite acidity allows for tailored synthesis of high-performance ZTCs.