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Related Concept Videos

Weak Base Solutions03:21

Weak Base Solutions

25.6K
Some compounds produce hydroxide ions when dissolved by chemically reacting with water molecules. In all cases, these compounds react only partially and so are classified as weak bases. These types of compounds are also abundant in nature and important commodities in various technologies. For example, global production of the weak base ammonia is typically well over 100 metric tons annually, being widely used as an agricultural fertilizer, a raw material for chemical synthesis of other...
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Titration Calculations: Weak Acid - Strong Base03:55

Titration Calculations: Weak Acid - Strong Base

49.4K
Calculating pH for Titration Solutions: Weak Acid/Strong Base
For the titration of 25.00 mL of 0.100 M CH3CO2H with 0.100 M NaOH, the reaction can be represented as:
49.4K
Titration of a Weak Acid with a Weak Base01:08

Titration of a Weak Acid with a Weak Base

5.0K
Weak acids and bases do not undergo dissociation completely, and titrations between these two are rarely studied. When such studies are performed, say, for the titration of a weak acid with a weak base, the titration curve plots the change in pH as a function of the volume of base added. Take the titration of acetic acid with ammonia, for instance. During the titration, these two species form ammonium acetate and water, but the pH change is slow and gradual.
As a result, there is no simple...
5.0K
Weak Acid Solutions04:02

Weak Acid Solutions

43.6K
Few compounds act as strong acids. A far greater number of compounds behave as weak acids and only partially react with water, leaving a large majority of dissolved molecules in their original form and generating a relatively small amount of hydronium ions. Weak acids are commonly encountered in nature, being the substances partly responsible for the tangy taste of citrus fruits, the stinging sensation of insect bites, and the unpleasant smells associated with body odor. A familiar example of a...
43.6K
Crystal Field Theory - Octahedral Complexes02:58

Crystal Field Theory - Octahedral Complexes

31.0K
Crystal Field Theory
To explain the observed behavior of transition metal complexes (such as colors), a model involving electrostatic interactions between the electrons from the ligands and the electrons in the unhybridized d orbitals of the central metal atom has been developed. This electrostatic model is crystal field theory (CFT). It helps to understand, interpret, and predict the colors, magnetic behavior, and some structures of coordination compounds of transition metals.
CFT focuses on...
31.0K
Crossed Aldol Reaction Using Weak Bases01:14

Crossed Aldol Reaction Using Weak Bases

2.7K
This lesson deals with the crossed aldol reaction using weak bases. The self-condensation of an aldehyde having α hydrogen is prevented by adding it slowly to a mixture of formaldehyde and weak bases like hydroxide and alkoxide. Upon slow addition of the aldehyde, the base deprotonates the α carbon of the aldehyde to form the corresponding enolate. The enolate subsequently attacks the formaldehyde to form a single crossed product. Figure 1 depicts the aforementioned reaction.
2.7K

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Effect of Bending on the Electrical Characteristics of Flexible Organic Single Crystal-based Field-effect Transistors
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A Well-Established POM-based Single-Crystal Proton-Conducting Model Incorporating Multiple Weak Interactions.

Xue-Li Cao1, Shuai-Lei Xie2, Shun-Li Li1

  • 1School of Chemistry and Materials Science, Nanjing Normal University, Nanjing, 210023, P. R. China.

Chemistry (Weinheim an Der Bergstrasse, Germany)
|January 10, 2018
PubMed
Summary

Researchers developed new proton conductors using polyoxometalate anions and protonated imidazole derivatives. These materials exhibit high proton conductivity, with π-π stacking enhancing proton transfer pathways.

Keywords:
N-ligandhydrogen bondingpolyoxometalatesproton-conducting modelπ-π interactions

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Area of Science:

  • Materials Science
  • Solid-State Chemistry
  • Electrochemistry

Background:

  • Proton conductors are crucial for energy devices like fuel cells.
  • Developing materials with high proton conductivity and simple structures remains a challenge.
  • Polyoxometalates (POMs) offer versatile platforms for designing functional materials.

Purpose of the Study:

  • To synthesize novel proton conductors based on polyoxometalate anions and protonated heterocycles.
  • To investigate the relationship between material structure and proton conductivity.
  • To elucidate the mechanism of proton transfer, including the role of π-π stacking.

Main Methods:

  • Hydrothermal synthesis for material preparation.
  • Single-crystal X-ray diffraction for structural analysis.
  • Electrochemical impedance spectroscopy for proton conductivity measurements.
  • Computational studies (potential energy surface calculations) to understand proton transfer mechanisms.

Main Results:

  • Successfully synthesized three new proton conductors (NNU-6-8) with simple structures.
  • NNU-6 exhibited a high proton conductivity of 1.91×10⁻² S cm⁻¹ along the a-axis.
  • Proton conductivity was significantly higher along the a-axis compared to b- and c-axes due to enhanced hydrogen-bonding and π-π stacking.
  • Demonstrated that π-π stacking between benzimidazole rings facilitates proton transfer.

Conclusions:

  • The new POM-based materials are promising candidates for proton conductor applications.
  • The study highlights the importance of structural features, specifically π-π stacking, in optimizing proton conductivity.
  • This work provides a fundamental understanding of proton conduction mechanisms in such materials.