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Related Concept Videos

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...
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...
Crystal Field Theory - Tetrahedral and Square Planar Complexes02:46

Crystal Field Theory - Tetrahedral and Square Planar Complexes

Tetrahedral Complexes
Crystal field theory (CFT) is applicable to molecules in geometries other than octahedral. In octahedral complexes, the lobes of the dx2−y2 and dz2 orbitals point directly at the ligands. For tetrahedral complexes, the d orbitals remain in place, but with only four ligands located between the axes. None of the orbitals points directly at the tetrahedral ligands. However, the dx2−y2 and dz2 orbitals (along the Cartesian axes) overlap with the ligands less than the dxy,...
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...
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.
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...

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Gyroid Nickel Nanostructures from Diblock Copolymer Supramolecules
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Published on: April 28, 2014

A rectangular Ni-Fe cluster with unusual cyanide bridges.

Christoph Krüger1, Hiroki Sato, Takuto Matsumoto

  • 1Graduate School of Pure and Applied Sciences, University of Tsukuba, Tennodai 1-1-1, Tsukuba 305-8571, Japan.

Dalton Transactions (Cambridge, England : 2003)
|August 16, 2012
PubMed
Summary

Researchers synthesized an asymmetric iron complex and explored its compatibility with nickel ions. This led to the creation of chiral nickel-iron squares exhibiting ferromagnetic interactions.

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Synthesis of Nine-atom Deltahedral Zintl Ions of Germanium and their Functionalization with Organic Groups
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Area of Science:

  • Coordination chemistry
  • Supramolecular chemistry
  • Materials science

Background:

  • Asymmetric polycyanide iron complexes are building blocks for advanced materials.
  • Investigating the self-assembly of metal ions with polydentate ligands is crucial for designing novel supramolecular structures.
  • Understanding metal-ligand interactions is key to controlling magnetic properties.

Purpose of the Study:

  • To synthesize a novel asymmetric polycyanide iron complex.
  • To examine the complexation compatibility of the iron complex with nickel ions.
  • To investigate the formation of chiral supramolecular structures and their magnetic properties.

Main Methods:

  • Synthesis of K(2)[Fe(III)(L1)(CN)(4)](MeOH) using HL1 = 2,2'-(1H-pyrazole-3,5-diyl)bis-pyridine.
  • Coordination experiments with nickel ions in the presence of a chiral bidentate capping ligand.
  • Characterization of the resulting nickel-iron squares using spectroscopic and crystallographic techniques.
  • Magnetic susceptibility measurements to determine magnetic interactions.

Main Results:

  • Successful synthesis of the asymmetric polycyanide iron complex.
  • Formation of two types of enantiomeric nickel-iron square complexes.
  • Observation of unusual cyanide bridge geometry within the square structures.
  • Evidence of ferromagnetic interactions between nickel and iron ions within the supramolecular assemblies.

Conclusions:

  • The asymmetric iron complex serves as a versatile precursor for constructing chiral metal-organic frameworks.
  • The chiral capping ligand effectively directs the self-assembly process, leading to enantiomeric square structures.
  • The observed ferromagnetic interactions highlight the potential of these materials for molecular magnetism applications.
  • This study demonstrates a pathway for designing complex chiral magnetic materials through coordination chemistry.