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Metallic Solids02:37

Metallic Solids

21.1K
Metallic solids such as crystals of copper, aluminum, and iron are formed by metal atoms. The structure of metallic crystals is often described as a uniform distribution of atomic nuclei within a “sea” of delocalized electrons. The atoms within such a metallic solid are held together by a unique force known as metallic bonding that gives rise to many useful and varied bulk properties.
All metallic solids exhibit high thermal and electrical conductivity, metallic luster, and malleability....
21.1K
Aldehydes and Ketones with HCN: Cyanohydrin Formation Overview01:32

Aldehydes and Ketones with HCN: Cyanohydrin Formation Overview

4.0K
Cyanohydrins are compounds that contain –CN and –OH groups on the same carbon atom. They are formed by the nucleophilic addition of the cyanide ions to the carbonyl group. Cyanide ions are highly basic and nucleophilic and can be generated from HCN under aqueous conditions. However, since HCN is a weak acid, the number of cyanide ions generated is very small. Hence, a small amount of base or KCN/NaCN is added to HCN to increase the concentration of the cyanide ions in the reaction...
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Aldehydes and Ketones with HCN: Cyanohydrin Formation Mechanism01:10

Aldehydes and Ketones with HCN: Cyanohydrin Formation Mechanism

4.5K
Cyanohydrins are formed when cyanide nucleophiles and carbonyl compounds like aldehydes and ketones react. A strong base, the cyanide ion, catalyzes cyanohydrin formation. The ions are generated from HCN under aqueous conditions. Once the cyanide ions are generated, the first step involves the nucleophilic attack of the cyanide ions on the electrophilic carbonyl carbon. This attack shifts the π electrons from the C=O to the oxygen atom forming the alkoxide ion intermediate. The alkoxide anion...
4.5K
Colors and Magnetism03:02

Colors and Magnetism

14.3K
Color in Coordination Complexes
When atoms or molecules absorb light at the proper frequency, their electrons are excited to higher-energy orbitals. For many main group atoms and molecules, the absorbed photons are in the ultraviolet range of the electromagnetic spectrum, which cannot be detected by the human eye. For coordination compounds, the energy difference between the d orbitals often allows photons in the visible range to be absorbed and emitted, which is seen as colors by the human...
14.3K
Coordination Number and Geometry02:57

Coordination Number and Geometry

19.2K
For transition metal complexes, the coordination number determines the geometry around the central metal ion. Table 1 compares coordination numbers to molecular geometry. The most common structures of the complexes in coordination compounds are octahedral, tetrahedral, and square planar.
19.2K
Valence Bond Theory02:42

Valence Bond Theory

11.4K
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...
11.4K

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Half-Filled Honeycomb Transition-Metal Cyanamide Fe3Cr2(NCN)6.

Hicham Bourakhouadar1, Juan Medina-Jurado1, Tong Zhu2

  • 1Chair of Solid-State and Quantum Chemistry, Institute of Inorganic Chemistry, RWTH Aachen University, Aachen 52056, Germany.

Inorganic Chemistry
|February 25, 2026
PubMed
Summary

A new ternary cyanamide, Fe3Cr2(NCN)6, was synthesized and characterized. This compound exhibits complex magnetic interactions, transitioning to long-range order at 160 K, potentially indicating ferrimagnetism or weak ferromagnetism.

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Area of Science:

  • Solid-state chemistry
  • Materials science
  • Magnetism

Background:

  • Ternary cyanamides are an emerging class of materials with potential magnetic applications.
  • Understanding the structure-property relationships in novel transition metal compounds is crucial for developing new functional materials.

Purpose of the Study:

  • To synthesize and characterize a novel ternary cyanamide, Fe3Cr2(NCN)6.
  • To investigate the crystal structure and magnetic properties of this new compound.
  • To explore potential magnetic ordering phenomena.

Main Methods:

  • Solid-state metathesis synthesis using ZnNCN.
  • Powder X-ray diffraction for initial crystal structure determination.
  • Neutron diffraction for unambiguous atomic site assignment.
  • X-ray absorption near-edge structure (XANES) for oxidation state confirmation.

Main Results:

  • The crystal structure of Fe3Cr2(NCN)6 was determined to be orthorhombic Pnnm, derived from NiAs with a vacancy-ordered framework.
  • Fe and Cr cations form distinct honeycomb and triangular motifs within the layered structure.
  • The compound displays predominantly antiferromagnetic interactions at high temperatures, with a magnetic transition at 160 K.
  • Below 160 K, hysteresis and weak remanent magnetization suggest either ferrimagnetic or weak ferromagnetic behavior.

Conclusions:

  • Fe3Cr2(NCN)6 is a novel ternary cyanamide with a unique layered structure and ordered cation framework.
  • The magnetic properties indicate complex antiferromagnetic interactions evolving into long-range order with potential ferrimagnetic or weak ferromagnetic characteristics below 160 K.
  • This discovery opens avenues for exploring new magnetic materials based on cyanamide frameworks.