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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.
Ionic Crystal Structures02:42

Ionic Crystal Structures

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...
Valence Bond Theory02:42

Valence Bond Theory

Coordination compounds and complexes exhibit different colors, geometries, and magnetic behavior, depending on the metal atom/ion and ligands from which they are composed. In an attempt to explain the bonding and structure of coordination complexes, Linus Pauling proposed the valence bond theory, or VBT, using the concepts of hybridization and the overlapping of the atomic orbitals. According to VBT, the central metal atom or ion (Lewis acid) hybridizes to provide empty orbitals of suitable...
Crystal Field Theory - Octahedral Complexes02:58

Crystal Field Theory - Octahedral Complexes

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...
Crystal Field Theory - Tetrahedral and Square Planar Complexes02:46

Crystal Field Theory - Tetrahedral and Square Planar Complexes

Tetrahedral Complexes
Crystal field theory (CFT) is applicable to molecules in geometries other than octahedral. In octahedral complexes, the lobes of the dx2−y2 and dz2 orbitals point directly at the ligands. For tetrahedral complexes, the d orbitals remain in place, but with only four ligands located between the axes. None of the orbitals points directly at the tetrahedral ligands. However, the dx2−y2 and dz2 orbitals (along the Cartesian axes) overlap with the ligands less than the dxy,...
Imperfections in Crystal Structure: Stoichiometric Point Defects01:26

Imperfections in Crystal Structure: Stoichiometric Point Defects

Schottky defects arise when some lattice points in a crystal, such as those in NaCl, remain unoccupied, creating lattice vacancies without disturbing the overall electrical neutrality of the crystal. This defect is common in ionic crystals where the positive and negative ions are similar in size, as seen in sodium chloride and cesium chloride. The presence of Schottky defects enables the crystal to conduct electricity to a small extent through an ionic mechanism. Electric fields cause nearby...

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Updated: May 9, 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

Ferroelectric ordering in imidazolium perchlorate.

Z Pajak1, P Czarnecki, B Szafrańska

  • 1Institute of Physics, A. Mickiewicz University, 61-614 Poznań, Poland. zpajak@amu.edu.pl

The Journal of Chemical Physics
|April 22, 2006
PubMed
Summary

This study synthesized imidazolium perchlorate, revealing solid-state phase transitions and ferroelectric properties. The crystal exhibits cationic disorder and a Curie point at 373 K, indicating potential for new ferroelectric materials.

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Area of Science:

  • Solid-state chemistry
  • Materials science
  • Crystallography

Background:

  • Imidazolium perchlorate is a salt with potential applications in materials science.
  • Understanding its structural and dielectric properties is crucial for its technological development.

Purpose of the Study:

  • To synthesize and characterize imidazolium perchlorate.
  • To investigate its phase transitions, crystal structure, and ferroelectric behavior.

Main Methods:

  • Differential scanning calorimetry
  • X-ray diffraction
  • Proton magnetic resonance
  • Optical observation
  • Dielectric spectroscopy

Main Results:

  • Disclosed polymorphic solid-solid phase transitions at 487, 373, and 247 K.
  • Determined crystal structure at 298 K (trigonal, R3m) and 385 K, noting cationic disorder and perchlorate order/disorder.
  • Identified ferroelectric properties with a Curie point at 373 K, attributed to distorted perchlorate anions.

Conclusions:

  • Imidazolium perchlorate exhibits complex phase transitions and significant cationic disorder.
  • The compound demonstrates ferroelectric behavior, making it a new potential ferroelectric material.