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Related Concept Videos

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...
Valence Bond Theory02:45

Valence Bond Theory

Overview of Valence Bond Theory
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.
Metal-Ligand Bonds02:51

Metal-Ligand Bonds

The hemoglobin in the blood, the chlorophyll in green plants, vitamin B-12, and the catalyst used in the manufacture of polyethylene all contain coordination compounds. Ions of the metals, especially the transition metals, are likely to form complexes.
In these complexes, transition metals form coordinate covalent bonds, a kind of Lewis acid-base interaction in which both of the electrons in the bond are contributed by a donor (Lewis base) to an electron acceptor (Lewis acid). The Lewis acid in...
Coordination Compounds and Nomenclature02:54

Coordination Compounds and Nomenclature

In most main group element compounds, the valence electrons of the isolated atoms combine to form chemical bonds that satisfy the octet rule. For instance, the four valence electrons of carbon overlap with electrons from four hydrogen atoms to form CH4. The one valence electron leaves sodium and adds to the seven valence electrons of chlorine to form the ionic formula unit NaCl (Figure 1a). Transition metals do not normally bond in this fashion. They primarily form coordinate covalent bonds, a...
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...

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Direct solvothermal crystallisation of the metastable cubic perovskite CsMnF<sub>3</sub> and its magnetism.

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Characterization of Electrode Materials for Lithium Ion and Sodium Ion Batteries Using Synchrotron Radiation Techniques
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Extended Anionic Network in Mixed-Valent Nitridocobaltates(I/II) LnCo2N2 (Ln = La, Pr, Nd).

Nina A M Prinz1, Jonas M Albrecht1, Dominik Werhahn1

  • 1Department Chemistry, LMU Munich, Munich, Germany.

Advanced Science (Weinheim, Baden-Wurttemberg, Germany)
|July 9, 2026
PubMed
Summary

Researchers synthesized novel nitridocobaltates (LnCo2N2) with layered cobalt-nitrogen frameworks using high-pressure techniques. These materials exhibit metallic properties and a unique mixed-valent cobalt state, expanding possibilities for late transition metal nitrides.

Keywords:
high‐pressure synthesisneutron diffractionnitridestransition metals

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Published on: April 12, 2019

Area of Science:

  • Solid State Chemistry
  • Materials Science
  • Inorganic Chemistry

Background:

  • Nitridometallates with extended anionic frameworks show unique electronic properties.
  • Late transition metal nitrides are rare due to high oxidation state and nitrogen content requirements.

Purpose of the Study:

  • To synthesize and characterize a new family of nitridocobaltates, LnCo2N2 (Ln = La, Pr, Nd).
  • To investigate the structural, electronic, and magnetic properties of these novel materials.

Main Methods:

  • High-pressure synthesis (8 GPa) using a large volume press.
  • X-ray crystallography for structural determination (trigonal space group R-3).
  • Magnetization studies and powder neutron diffraction for electronic and magnetic characterization.

Main Results:

  • Successful synthesis of LnCo2N2 compounds with layered cobalt-nitrogen networks related to the Kagome lattice.
  • Compounds exhibit a metallic ground state and suppression of rare earth magnetic ordering.
  • Discovery of a mixed-valent Co+I/+II state, a high oxidation state for nitridocobaltates.

Conclusions:

  • High-pressure synthesis enables structural diversity in late nitridometallates.
  • The synthesized nitridocobaltates offer a new platform for exploring intriguing electronic properties.
  • Systematic exploration of these materials can be pursued for advanced applications.