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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.
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...
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...
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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Synthesis of Functionalized Magnetic Nanoparticles, Their Conjugation with the Siderophore Feroxamine and its Evaluation for Bacteria Detection
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Magnetic Mn and Co complexes with a large polycyclic aromatic substituted nitronylnitroxide.

Maria G F Vaz1, Rafael A Allão, Handan Akpinar

  • 1Instituto de Química, Universidade Federal Fluminense, Niterói, RJ 24020-150, Brazil. mariavaz@vm.uff.br

Inorganic Chemistry
|February 24, 2012
PubMed
Summary

This study synthesized novel manganese and cobalt complexes with a pyrenyl nitroxide radical ligand. These complexes exhibit interesting magnetic properties, including strong antiferromagnetic exchange interactions, leading to ferrimagnetic behavior in chain structures.

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Manganese Oxide Nanoparticle Synthesis by Thermal Decomposition of Manganese(II) Acetylacetonate
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Manganese Oxide Nanoparticle Synthesis by Thermal Decomposition of Manganese(II) Acetylacetonate

Published on: June 18, 2020

Area of Science:

  • Coordination Chemistry
  • Materials Science
  • Magnetochemistry

Background:

  • Nitroxide radicals are versatile ligands in coordination chemistry.
  • Metal-radical complexes offer tunable magnetic properties.
  • Understanding exchange interactions is crucial for designing magnetic materials.

Purpose of the Study:

  • To synthesize and characterize new metal complexes incorporating the 2-(1'-Pyrenyl)-4,4,5,5-tetramethyl-4,5-dihydro-1H-imidazole-3-oxide-1-oxyl (PyrNN) radical ligand.
  • To investigate the magnetic properties and structural characteristics of these complexes.
  • To explore the nature of magnetic exchange interactions within the complexes.

Main Methods:

  • Reaction of PyrNN with M(hfac)(2) (M = Mn(II), Co(II)) to form ML(2) and 1-D polymer chain complexes.
  • X-ray crystallography to determine the crystal structures of the synthesized complexes.
  • Magnetic susceptibility measurements and analysis using magnetic models.
  • Hybrid density functional theory (DFT) computations to model intermolecular exchange interactions.

Main Results:

  • Two isostructural ML(2) complexes, M(hfac)(2)(PyrNN)(2), and a 1-D polymer chain complex, [Mn(hfac)(2)(PyrNN)], were synthesized.
  • ML(2) complexes feature monoclinic unit cells with PyrNN ligands coordinating through one NO unit to the metal center.
  • Magnetic analysis revealed significant intracomplex (J) and intermolecular (J') exchange interactions, with strong antiferromagnetic coupling observed in the 1-D chain complex, resulting in ferrimagnetic behavior.
  • DFT calculations supported the experimental estimations of intermolecular exchange (J').

Conclusions:

  • The synthesized metal-radical complexes exhibit diverse structural motifs and magnetic behaviors.
  • The PyrNN ligand effectively mediates magnetic exchange interactions between metal centers and radical units.
  • The 1-D helical chain structure with strong antiferromagnetic exchange leads to overall ferrimagnetic properties, highlighting potential for molecular magnetism applications.