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Related Concept Videos

Ferromagnetism01:31

Ferromagnetism

Materials like iron, nickel, and cobalt consist of magnetic domains, within which the magnetic dipoles are arranged parallel to each other. The magnetic dipoles are rigidly aligned in the same direction within a domain by quantum mechanical coupling among the atoms. This coupling is so strong that even thermal agitation at room temperature cannot break it. The result is that each domain has a net dipole moment. However, some materials have weaker coupling, and are ferromagnetic at lower...
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.
Diamagnetism01:26

Diamagnetism

Materials consisting of paired electrons have zero net magnetic moments. However, when these materials are placed under an external magnetic field, the moments opposite to the field are induced. Such materials are called diamagnets. Diamagnetism is the response of the diamagnets when placed in an external magnetic field.
Diamagnetism was discovered by Anton Brugmans in 1778 when he observed that bismuth gets repelled by magnetic fields, thus theorizing that diamagnets get repelled by magnets.
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...
Other Nuclides: 31P, 19F, 15N NMR01:16

Other Nuclides: 31P, 19F, 15N NMR

Many organic, inorganic, and biological molecules contain spin-half nuclei such as nitrogen-15, fluorine-19, and phosphorus-31. As a result, NMR studies of these nuclei have found extensive applications in chemical and biological research.
While fluorine-19 and phosphorous-31 have high natural abundances (100%) and positive gyromagnetic ratios, nitrogen-15 has a low natural abundance and a negative gyromagnetic ratio. However, nitrogen-15 is still preferred over nitrogen-14 (which has a high...
Types Of Superconductors01:28

Types Of Superconductors

A superconductor is a substance that offers zero resistance to the electric current when it drops below a critical temperature. Zero resistance is not the only interesting phenomenon as materials reach their transition temperatures. A second effect is the exclusion of magnetic fields. This is known as the Meissner effect. A light, permanent magnet placed over a superconducting sample will levitate in a stable position above the superconductor. High-speed trains that levitate on strong...

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Fabrication of Magnetic Nanostructures on Silicon Nitride Membranes for Magnetic Vortex Studies Using Transmission Microscopy Techniques
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Ferromagnetic Ni(II) discs.

Richard T W Scott1, Leigh F Jones, Ian S Tidmarsh

  • 1School of Chemistry, West Mains Road, Edinburgh, UK.

Chemistry (Weinheim an Der Bergstrasse, Germany)
|September 17, 2009
PubMed
Summary
This summary is machine-generated.

Researchers developed planar nickel(II) complexes with strong ferromagnetic properties. The decametallic and octametallic clusters are rare single-molecule magnets, with the decametallic complex showing a record high barrier to magnetization reversal for nickel(II) systems.

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Area of Science:

  • Coordination Chemistry
  • Magnetochemistry
  • Materials Science

Background:

  • Nickel(II) complexes are explored for their magnetic properties.
  • Single-molecule magnets (SMMs) are of interest for potential applications in high-density data storage and quantum computing.
  • Developing new SMMs with enhanced properties, such as higher blocking temperatures and larger coercivities, remains a key challenge.

Purpose of the Study:

  • To synthesize and characterize novel planar disc-like nickel(II) clusters.
  • To investigate the magnetic properties, particularly the exchange interactions and single-molecule magnet behavior, of these nickel(II) complexes.
  • To explore the potential of these complexes as building blocks for advanced magnetic materials.

Main Methods:

  • Synthesis of hexa-, octa-, and decametallic nickel(II) complexes.
  • Single-crystal X-ray diffraction for structural determination.
  • Magnetic susceptibility measurements (DC and AC) to probe magnetic behavior.
  • Analysis of exchange interactions and relaxation dynamics.

Main Results:

  • A series of planar disc-like nickel(II) complexes, including hexa-, octa-, and decametallic structures, were successfully synthesized.
  • Dominant ferromagnetic exchange interactions were observed in these complexes.
  • The decametallic ([Ni(II)(10)]) and octametallic ([Ni(II)(8)]) clusters were identified as rare examples of nickel(II)-based single-molecule magnets.
  • Complex [Ni(II)(10)] (1) exhibited the largest barrier to magnetization reversal reported to date for any nickel(II) single-molecule magnet.

Conclusions:

  • The synthesized planar nickel(II) complexes display significant ferromagnetic coupling.
  • The identified octametallic and decametallic clusters represent promising single-molecule magnet candidates.
  • [Ni(II)(10)] (1) sets a new benchmark for nickel(II) SMMs due to its exceptionally large barrier to magnetization reversal, highlighting the potential of such disc-like structures.