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Related Concept Videos

Ionic Crystal Structures02:42

Ionic Crystal Structures

17.1K
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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Bond Polarity, Dipole Moment, and Percent Ionic Character02:48

Bond Polarity, Dipole Moment, and Percent Ionic Character

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Bond Polarity
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Molecular and Ionic Solids02:54

Molecular and Ionic Solids

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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.
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...
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Ionic Radii03:10

Ionic Radii

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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

131.0K
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
Ionic bonds are reversible electrostatic interactions between ions...
131.0K
Ionic Bonding and Electron Transfer02:48

Ionic Bonding and Electron Transfer

49.2K
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. 
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Related Experiment Video

Updated: Feb 5, 2026

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

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Long-Persistent Circularly Polarized Phosphorescence from Chiral Organic Ionic Crystals.

Wenjie Chen1,2,3, Zimin Tian4, Yuangang Li4

  • 1Beijing National Laboratory for Molecular Science, CAS Key Laboratory of Colloid Interface and Chemical Thermodynamics, Institute of Chemistry, Chinese Academy of Sciences, No. 2 ZhongGuanCun BeiYiJie, Beijing, 100190, P. R. China.

Chemistry (Weinheim an Der Bergstrasse, Germany)
|September 20, 2018
PubMed
Summary

Chiral organic ionic crystals now exhibit long-persistent circularly polarized phosphorescence (LPCPP) at room temperature. This breakthrough utilizes terephthalic acid and chiral α-phenylethylamines for efficient light emission.

Keywords:
chiralitycircularly polarized luminescencefluorescencelong persistent phosphorescenceorganic ionic crystalsphotochemistry

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Area of Science:

  • Materials Science
  • Organic Chemistry
  • Photophysics

Background:

  • Long-persistent phosphorescence (LPP) is crucial for applications like lighting and anti-counterfeiting.
  • Achieving circularly polarized phosphorescence (CPP) in organic materials at room temperature remains a significant challenge.
  • Chiral organic ionic crystals offer a promising platform for exploring novel photophysical properties.

Purpose of the Study:

  • To achieve long-persistent circularly polarized phosphorescence (LPCPP) in chiral organic ionic crystals at room temperature.
  • To investigate the relationship between molecular structure and chiroptical properties in these materials.
  • To explore the potential of these materials for advanced optical applications.

Main Methods:

  • Synthesis of co-crystals composed of terephthalic acid (TPA) and chiral α-phenylethylamines (PEAs).
  • Characterization of photophysical properties, including phosphorescence lifetime and circular polarization.
  • Structural analysis using X-ray diffraction to understand molecular arrangement and chirality.

Main Results:

  • Successfully achieved LPCPP in chiral organic ionic crystals at room temperature for the first time.
  • Co-crystals exhibited long phosphorescence lifetimes up to 862 ms.
  • Demonstrated a large dissymmetric factor (glum), indicating efficient circular polarization.
  • Observed mirror-image twisted molecular structures responsible for chiroptical activation.

Conclusions:

  • Chiral organic ionic crystals are viable hosts for achieving LPCPP at room temperature.
  • The hybridization of TPA with chiral PEAs enables circular polarization of long-persistent phosphorescence.
  • Molecular chirality and ordered structures in rigid lattices are key to chiroptical activation of LPP.