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Related Concept Videos

Structural Isomerism02:34

Structural Isomerism

Isomerism in Complexes
Isomers are different chemical species that have the same chemical formula. Structural isomerism of coordination compounds can be divided into two subcategories, the linkage isomers and coordination-sphere isomers.
Linkage isomers occur when the coordination compound contains a ligand that can bind to the transition metal center through two different atoms. For example, the CN− ligand can bind through the carbon atom or through the nitrogen atom. Similarly, SCN− can be...
Precipitation of Ions03:11

Precipitation of Ions

Predicting Precipitation
The equation that describes the equilibrium between solid calcium carbonate and its solvated ions is:
Redox Titration: Iodimetry and Iodometry01:23

Redox Titration: Iodimetry and Iodometry

Iodometry and iodimetry are analytical methods used to determine the concentration of oxidizing or reducing agents using iodine. In iodometric titrations, the oxidizing analyte solution is usually acidified and treated with an excess of iodide ions, which generates an equivalent amount of iodine in equilibrium with triiodide. The released iodine is subsequently titrated directly against a standardized reducing agent. As the dilute iodine color becomes pale yellow, a few drops of freshly...
Common Ion Effect03:24

Common Ion Effect

Compared with pure water, the solubility of an ionic compound is less in aqueous solutions containing a common ion (one also produced by dissolution of the ionic compound). This is an example of a phenomenon known as the common ion effect, which is a consequence of the law of mass action that may be explained using Le Châtelier’s principle. Consider the dissolution of silver iodide:
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...
Formation of Complex Ions03:45

Formation of Complex Ions

A type of Lewis acid-base chemistry involves the formation of a complex ion (or a coordination complex) comprising a central atom, typically a transition metal cation, surrounded by ions or molecules called ligands. These ligands can be neutral molecules like H2O or NH3, or ions such as CN− or OH−. Often, the ligands act as Lewis bases, donating a pair of electrons to the central atom. These types of Lewis acid-base reactions are examples of a broad subdiscipline called coordination...

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Updated: May 28, 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

LiMn(IO3)3: A Noncentrosymmetric Iodate Synthesized by Polyhedral Volume Ratio Modulation.

Ruilan Kong1, Weitong Wang1, Shuoxing Yang1

  • 1State Key Laboratory of Crystal Materials, Tianjin Key Laboratory of Functional Crystal Materials, Institute of Functional Crystals, Tianjin University of Technology, Tianjin 300384, China.

Inorganic Chemistry
|May 26, 2026
PubMed
Summary

Researchers designed a new noncentrosymmetric (NCS) material, LiMn(IO3)3, by modifying crystal frameworks. This novel iodate exhibits excellent nonlinear optical properties, making it promising for advanced optical applications.

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Chemoselective Preparation of 1-Iodoalkynes, 1,2-Diiodoalkenes, and 1,1,2-Triiodoalkenes Based on the Oxidative Iodination of Terminal Alkynes
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Chemoselective Preparation of 1-Iodoalkynes, 1,2-Diiodoalkenes, and 1,1,2-Triiodoalkenes Based on the Oxidative Iodination of Terminal Alkynes
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Chemoselective Preparation of 1-Iodoalkynes, 1,2-Diiodoalkenes, and 1,1,2-Triiodoalkenes Based on the Oxidative Iodination of Terminal Alkynes

Published on: September 12, 2018

Area of Science:

  • Materials Science
  • Solid-State Chemistry
  • Crystallography

Background:

  • Noncentrosymmetric (NCS) materials are crucial for nonlinear optics.
  • The α-LiIO3-type framework (AnM(IO3)m) offers a tunable platform for designing NCS materials.
  • Structural parameters, like the volume ratio of coordination polyhedra, influence material symmetry and properties.

Purpose of the Study:

  • To rationally design and synthesize a new NCS material with enhanced nonlinear optical properties.
  • To explore the relationship between structural features and macroscopic symmetry in AnM(IO3)m compounds.
  • To investigate the crystal structure and optical characteristics of the newly synthesized material.

Main Methods:

  • Systematic structural analysis of AnM(IO3)m compounds.
  • Rational selection of cations based on the volume ratio (VAOx/VMO6) criterion.
  • Synthesis and characterization of the new compound LiMn(IO3)3, including crystal structure determination and optical property measurements.
  • Theoretical investigation of the material's properties.

Main Results:

  • Successful synthesis of a new NCS iodate, LiMn(IO3)3.
  • LiMn(IO3)3 crystallizes in the polar P63 space group with aligned IO3 groups.
  • The material exhibits a strong second-harmonic generation (SHG) response (4.7 × KDP), a wide band gap (3.17 eV), and large birefringence (0.26 @1064 nm).

Conclusions:

  • The volume ratio of coordination polyhedra is a key factor in designing NCS materials within the AnM(IO3)m family.
  • LiMn(IO3)3 is a promising candidate for nonlinear optical applications due to its excellent properties.
  • This study demonstrates a successful strategy for targeted NCS material design through framework modification.