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Related Concept Videos

Thermal Electrocyclic Reactions: Stereochemistry01:17

Thermal Electrocyclic Reactions: Stereochemistry

The stereochemistry of electrocyclic reactions is strongly influenced by the orbital symmetry of the polyene HOMO. Under thermal conditions, the reaction proceeds via the ground-state HOMO.
Selection Rules: Thermal Activation
Conjugated systems containing an even number of π-electron pairs undergo a conrotatory ring closure. For example, thermal electrocyclization of (2E,4E)-2,4-hexadiene, a conjugated diene containing two π-electron pairs, gives trans-3,4-dimethylcyclobutene.
Thermal and Photochemical Electrocyclic Reactions: Overview01:26

Thermal and Photochemical Electrocyclic Reactions: Overview

Electrocyclic reactions are reversible reactions. They involve an intramolecular cyclization or ring-opening of a conjugated polyene. Shown below are two examples of electrocyclic reactions. In the first reaction, the formation of the cyclic product is favored. In contrast, in the second reaction, ring-opening is favored due to the high ring strain associated with cyclobutene formation.
Aromatic Hydrocarbon Cations: Structural Overview01:18

Aromatic Hydrocarbon Cations: Structural Overview

Cycloheptatriene is a neutral monocyclic unsaturated hydrocarbon that consists of an odd number of carbon atoms and an intervening sp3 carbon in the ring. The three double bonds in the ring correspond to 6 π electrons, which is a Huckel number, and therefore satisfies the criteria of 4n + 2 π electrons. However, the intervening sp3 carbon disrupts the continuous overlap of p orbitals. As a result, cycloheptatriene is not aromatic.
Removing one hydrogen from the intervening CH2 group with both...
Molecular and Ionic Solids02:54

Molecular and Ionic Solids

Crystalline solids are divided into four types: molecular, ionic, metallic, and covalent network based on the type of constituent units and their interparticle interactions.
Molecular Solids
Molecular crystalline solids, such as ice, sucrose (table sugar), and iodine, are solids that are composed of neutral molecules as their constituent units. These molecules are held together by weak intermolecular forces such as London dispersion forces, dipole-dipole interactions, or hydrogen bonds, which...
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.
Aromatic Hydrocarbon Anions: Structural Overview01:18

Aromatic Hydrocarbon Anions: Structural Overview

Neutral hydrocarbons like cyclopentadiene with an odd number of carbon atoms and one intervening CH2 group in the ring are not aromatic. Cyclopentadiene with 4 π electrons does not satisfy the 4n + 2 π electron rule. Additionally, the intervening CH2 group is sp3 hybridized and lacks a vacant p orbital, thereby interrupting the overlap of p orbitals in a continuous manner and preventing the delocalization of π electrons throughout the ring.
Due to the absence of continuous overlap of p...

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Related Experiment Video

Updated: May 11, 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

Interesting thermal variations owing to cationic ring structural features in protic ionic liquids.

Gitanjali Rai1, Anil Kumar

  • 1Physical Chemistry Division, National Chemical Laboratory, Pune 411008, India.

Physical Chemistry Chemical Physics : PCCP
|May 1, 2013
PubMed
Summary
This summary is machine-generated.

Hydrophobicity modifications in protic ionic liquids create unique thermal signatures. These distinct thermal fingerprints help differentiate protic ionic liquids from aprotic ionic liquids and electrolytes in water.

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Last Updated: May 11, 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

Synthesis of Ionic Liquid Based Electrolytes, Assembly of Li-ion Batteries, and Measurements of Performance at High Temperature
11:04

Synthesis of Ionic Liquid Based Electrolytes, Assembly of Li-ion Batteries, and Measurements of Performance at High Temperature

Published on: December 20, 2016

Orientational Transition in a Liquid Crystal Triggered by the Thermodynamic Growth of Interfacial Wetting Sheets
06:26

Orientational Transition in a Liquid Crystal Triggered by the Thermodynamic Growth of Interfacial Wetting Sheets

Published on: May 15, 2017

Area of Science:

  • Physical Chemistry
  • Materials Science
  • Ionic Liquids

Background:

  • Ionic liquids (ILs) are salts that are liquid below 100°C, with applications in various fields.
  • Distinguishing between different types of ILs and electrolytes in aqueous solutions is crucial for their effective application.
  • Thermal behavior is a key property that can be influenced by structural modifications.

Purpose of the Study:

  • To investigate the thermal behavior of protic ionic liquids (PILs) with modified hydrophobicity.
  • To establish methods for differentiating PILs from aprotic ionic liquids (AILs) and common electrolytes in aqueous media.
  • To explore the potential of thermal signatures as unique identifiers for these substances.

Main Methods:

  • Synthesis and characterization of PILs with varying degrees of hydrophobicity in their cationic structures.
  • Thermal analysis techniques (e.g., Differential Scanning Calorimetry, Thermogravimetric Analysis) were employed.
  • Comparative studies of thermal behavior in aqueous solutions of PILs, AILs, and conventional electrolytes.

Main Results:

  • Significant differences in thermal behavior were observed among PILs, AILs, and electrolytes.
  • Hydrophobicity modifications in PILs led to distinct thermal signatures.
  • These thermal signatures act as unique fingerprints, enabling clear differentiation between the substance classes.

Conclusions:

  • The thermal behavior of ionic liquids is sensitive to structural modifications, specifically hydrophobicity.
  • Thermal analysis provides a reliable method for distinguishing between protic ionic liquids, aprotic ionic liquids, and electrolytes in water.
  • This research offers a valuable tool for identifying and classifying ionic liquids and related electrolytes.