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Related Concept Videos

Ionic Bonding and Electron Transfer02:48

Ionic Bonding and Electron Transfer

Ions are atoms or molecules bearing an electrical charge. A cation (a positive ion) forms when a neutral atom loses one or more electrons from its valence shell, and an anion (a negative ion) forms when a neutral atom gains one or more electrons in its valence shell. Compounds composed of ions are called ionic compounds (or salts), and their constituent ions are held together by ionic bonds: electrostatic forces of attraction between oppositely charged cations and anions.
Diazonium Group Substitution: –OH and –H01:19

Diazonium Group Substitution: –OH and –H

Nitrous acid, a weak acid, is prepared in situ via the reaction of sodium nitrite with a strong acid under cold conditions. This nitrous acid prepared in situ reacts with primary arylamines to form arenediazonium salts. Such reactions are known as diazotization reactions. As shown in Figure 1, the formation of arenediazonium salts begins with the decomposition of nitrous acid in an acidic solution to give nitrosonium ions.
Ionic Association01:28

Ionic Association

The ionic association is the association of oppositely charged ions in an electrolyte solution to form ion pairs. Bjerrum defined ion pairs as two oppositely charged ions whose electrostatic attraction exceeds the thermal energy of the system, typically expressed as 2kT. Electrostatic attraction depends on ionic charge, separation distance, and the dielectric constant of the medium. Thermal energy, represented by kT, reflects the tendency of ions to move independently due to molecular motion.
Carboxylic Acids to Methylesters: Alkylation using Diazomethane01:33

Carboxylic Acids to Methylesters: Alkylation using Diazomethane

Carboxylic acids react with diazomethane in an ether solvent via alkylation at the carboxylate oxygen atom to give methyl esters of the corresponding acid with excellent yields.
Electrophilic Addition to Alkynes: Halogenation02:38

Electrophilic Addition to Alkynes: Halogenation

Introduction
Halogenation is another class of electrophilic addition reactions where a halogen molecule gets added across a π bond. In alkynes, the presence of two π bonds allows for the addition of two equivalents of halogens (bromine or chlorine). The addition of the first halogen molecule forms a trans-dihaloalkene as the major product and the cis isomer as the minor product. Subsequent addition of the second equivalent yields the tetrahalide.
Alkyl Halides02:45

Alkyl Halides

Structural Properties
Alkyl halides are halogen-substituted alkanes wherein one or more hydrogen atoms of an alkane is replaced by a halogen atom such as fluorine, chlorine, bromine, or iodine. The carbon atom in an alkyl halide is bonded to the halogen atom, which is sp3-hybridized and exhibits a tetrahedral shape.
Unlike alkyl halides, compounds in which a halogen atom is bonded to an sp2 -hybridized carbon atom of a carbon-carbon double bond (C=C) are called vinyl halides. Whereas aryl...

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Updated: Jun 25, 2026

From Molecules to Materials: Engineering New Ionic Liquid Crystals Through Halogen Bonding
06:44

From Molecules to Materials: Engineering New Ionic Liquid Crystals Through Halogen Bonding

Published on: March 24, 2018

Hypergolic ionic liquids with the 2,2-dialkyltriazanium cation.

Haixiang Gao1, Young-Hyuk Joo, Brendan Twamley

  • 1Department of Applied Chemistry, China Agricultural University, Beijing, 100193, China.

Angewandte Chemie (International Ed. in English)
|March 7, 2009
PubMed
Summary

Ionic liquids with a 2,2-dialkyltriazanium cation are hypergolic, igniting on contact. The anion choice significantly impacts ignition delay times for these energetic materials.

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Development, Characterization, and Evaluation of CAGE-based Ionic Liquid Systems for Transdermal Delivery

Published on: September 26, 2025

Area of Science:

  • Chemistry
  • Materials Science
  • Propulsion Engineering

Background:

  • Hypergolic propellants ignite spontaneously upon contact, crucial for reliable rocket and spacecraft ignition.
  • Ionic liquids (ILs) offer tunable properties, making them candidates for advanced propellant formulations.
  • Understanding the structure-property relationships in ILs is key to designing efficient energetic materials.

Purpose of the Study:

  • To investigate the hypergolic behavior of ionic liquids based on the 2,2-dialkyltriazanium cation.
  • To determine the influence of various anions on the hypergolic properties and ignition delay times.
  • To identify potential candidates for novel, high-performance hypergolic propellants.

Main Methods:

  • Synthesis of 2,2-dialkyltriazanium salts with different anions (nitrate, chloride, nitrocyanamide, dicyanamide).
  • Experimental evaluation of hypergolicity through ignition tests.
  • Measurement of ignition delay times under controlled conditions.

Main Results:

  • The 2,2-dialkyltriazanium cation, when paired with nitrate, chloride, nitrocyanamide, and dicyanamide anions, exhibits hypergolic characteristics.
  • Significant variations in ignition delay times were observed depending on the specific anion.
  • The study confirms the critical role of both cation and anion in dictating hypergolic performance.

Conclusions:

  • Ionic liquids incorporating the 2,2-dialkyltriazanium cation are viable hypergolic materials.
  • Anion selection is a critical parameter for optimizing ignition performance and controlling ignition delay.
  • These findings pave the way for the development of safer and more efficient hypergolic propellants.