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Related Concept Videos

Colors and Magnetism03:02

Colors and Magnetism

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 eye.
Metallic Solids02:37

Metallic Solids

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. Many...
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...
Extraction: Advanced Methods00:56

Extraction: Advanced Methods

Metal ions can be separated from one another by complexation with organic ligands–the chelating agent– to form uncharged chelates. Here, the chelating agent must contain hydrophobic groups and behave as a weak acid, losing a proton to bind with the metal. Since most organic ligands used in this process are insoluble or undergo oxidation in the aqueous phase, the chelating agent is initially added to the organic phase and extracted into the aqueous phase. The metal-ligand complex is formed in...
Aromatic Hydrocarbon Cations: Structural Overview01:18

Aromatic Hydrocarbon Cations: Structural Overview

Cycloheptatriene is a neutral monocyclic unsaturated hydrocarbon that consists of an odd number of carbon atoms and an intervening sp3 carbon in the ring. The three double bonds in the ring correspond to 6 π electrons, which is a Huckel number, and therefore satisfies the criteria of 4n + 2 π electrons. However, the intervening sp3 carbon disrupts the continuous overlap of p orbitals. As a result, cycloheptatriene is not aromatic.
Removing one hydrogen from the intervening CH2 group with both...
Coordination Number and Geometry02:57

Coordination Number and Geometry

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.

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Related Experiment Video

Updated: Jun 28, 2026

Preparation of a Corannulene-functionalized Hexahelicene by Copper(I)-catalyzed Alkyne-azide Cycloaddition of Nonplanar Polyaromatic Units
09:35

Preparation of a Corannulene-functionalized Hexahelicene by Copper(I)-catalyzed Alkyne-azide Cycloaddition of Nonplanar Polyaromatic Units

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Copper hexacyanoferrates: Preparation, composition and structure.

S Ayrault1, C Loss-Neskovic, M Fedoroff

  • 1Laboratoire P. Süe, C. E. N. Saclay, 91191 Gif-sur-Yvette, France.

Talanta
|September 1, 1994
PubMed
Summary
This summary is machine-generated.

This review covers copper hexacyanoferrates chemistry from 1933-1993. It emphasizes how preparation methods influence their compositions and structures.

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Area of Science:

  • Inorganic Chemistry
  • Materials Science

Background:

  • Copper hexacyanoferrates (CuHCFs) are coordination compounds with diverse applications.
  • Understanding their synthesis-structure-property relationships is crucial for materials development.

Purpose of the Study:

  • To review the chemistry of copper hexacyanoferrates from 1933 to 1993.
  • To correlate compositions and structures with preparation methodologies.

Main Methods:

  • Literature review of scientific publications from 1933-1993.
  • Analysis of reported compositions and structural data.
  • Comparison of various synthetic routes and their outcomes.

Main Results:

  • Detailed examination of different copper hexacyanoferrate phases.
  • Identification of key preparation techniques influencing CuHCF properties.
  • Correlation between synthesis parameters (e.g., pH, temperature, precursors) and resulting material characteristics.

Conclusions:

  • Preparation methods significantly dictate the composition and structure of copper hexacyanoferrates.
  • A historical perspective highlights the evolution of understanding CuHCF chemistry.
  • Further research can leverage this knowledge for targeted material design.