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Related Concept Videos

Synthesis and Decomposition Reactions02:17

Synthesis and Decomposition Reactions

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Synthesis and decomposition are two types of redox reactions. Synthesis means to make something, whereas decomposition means to break something. The reactions are accompanied by chemical and energy changes. 
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Crystalline solids are divided into four types: molecular, ionic, metallic, and covalent network based on the type of constituent units and their interparticle interactions.
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Ionic Radii03:10

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Ionic radius is the measure used to describe the size of an ion. A cation always has fewer electrons and the same number of protons as the parent atom; it is smaller than the atom from which it is derived. For example, the covalent radius of an aluminum atom (1s22s22p63s23p1) is 118 pm, whereas the ionic radius of an Al3+ (1s22s22p6) is 68 pm. As electrons are removed from the outer valence shell, the remaining core electrons occupying smaller shells experience a greater effective nuclear...
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Ionic Bonds00:42

Ionic Bonds

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Overview
When atoms gain or lose electrons to achieve a more stable electron configuration they form ions. Ionic bonds are electrostatic attractions between ions with opposite charges. Ionic compounds are rigid and brittle when solid and may dissociate into their constituent ions in water. Covalent compounds, by contrast, remain intact unless a chemical reaction breaks them.
Opposing Charges Hold Ions Together in Ionic Compounds
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Solubility of Ionic Compounds02:55

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Solubility is the measure of the maximum amount of solute that can be dissolved in a given quantity of solvent at a given temperature and pressure. Solubility is usually measured in molarity (M) or moles per liter (mol/L). A compound is termed soluble if it dissolves in water.
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Ionic Crystal Structures02:42

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Ionic crystals consist of two or more different kinds of ions that usually have different sizes. The packing of these ions into a crystal structure is more complex than the packing of metal atoms that are the same size.
Most monatomic ions behave as charged spheres, and their attraction for ions of opposite charge is the same in every direction. Consequently, stable structures for ionic compounds result (1) when ions of one charge are surrounded by as many ions as possible of the opposite...
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Pretreatment of Lignocellulosic Biomass with Low-cost Ionic Liquids
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Dicationic ionic liquid thermal decomposition pathways.

Rahul A Patil1, Mohsen Talebi1, Alain Berthod1,2

  • 1Department of Chemistry and Biochemistry, University of Texas at Arlington, 700 Planetarium Place, Arlington, TX, 76019, USA.

Analytical and Bioanalytical Chemistry
|January 31, 2018
PubMed
Summary
This summary is machine-generated.

Ionic liquids (ILs) offer unique properties, but their thermal stability varies with structure. This study identified that heteroatom-carbon bonds in dicationic ionic liquids are most susceptible to thermal decomposition.

Keywords:
Decomposition mechanismHigh temperatureIonic liquidThermal decompositionThermal stability

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Area of Science:

  • Materials Science
  • Chemistry
  • Chemical Engineering

Background:

  • Ionic liquids (ILs) are gaining prominence due to their tunable properties like low volatility and high thermal stability.
  • The structural diversity of ILs leads to significant variations in their physicochemical characteristics.
  • Understanding the thermal decomposition pathways of ILs is crucial for their safe and effective application.

Purpose of the Study:

  • To investigate the thermal stability of fifteen bis-/dicationic ionic liquids.
  • To identify the specific structural components most vulnerable to thermal degradation.
  • To determine if decomposition occurs prior to volatilization in these ILs.

Main Methods:

  • Synthesis and characterization of fifteen bis-/dicationic ionic liquids.
  • Thermal analysis techniques to induce decomposition.
  • Analysis of thermal breakdown products using advanced identification methods.
  • Correlation of decomposition products with specific structural features.

Main Results:

  • Heteroatom-carbon single bonds were identified as the primary sites for thermolytic decomposition in most tested ILs.
  • Thermal decomposition was observed to occur before significant volatilization for the studied compounds.
  • Specific decomposition products were linked to the cleavage of these susceptible bonds.

Conclusions:

  • The thermal stability of dicationic ionic liquids is strongly influenced by the presence and nature of heteroatom-carbon bonds.
  • Targeting these specific bonds through structural modification can enhance the thermal performance of ionic liquids.
  • This research provides critical insights for designing more robust ionic liquids for high-temperature applications.