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Related Concept Videos

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...
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...
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.
Paramagnetism01:30

Paramagnetism

Paramagnets are materials with unpaired electrons that possess a finite magnetic moment. In the absence of a magnetic field, these moments are randomly oriented, and thus the net moment is zero. Under an external field, a torque acting on the moments tends to align them along the field's direction. However, the random thermal motion of electrons produces a torque opposite to the external field and tries to disorient the moments. These two competing effects align only a few moments along the...
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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...
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Other Unique Bacteria

Magnetic bacteria exhibit a directed movement called magnetotaxis, driven by structures called magnetosomes. These magnetosomes consist of chains of magnetic particles made of either magnetite (Fe₃O₄) or greigite (Fe₃S₄) and are organized in a linear conformation by a protein scaffold within invaginations of the cell membrane. The bacteria align along the north–south magnetic field lines, much like a compass needle. They are typically microaerophilic or anaerobic and are commonly found near the...

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Purification of the M. magneticum Strain AMB-1 Magnetosome Associated Protein MamAΔ41
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Photoinduced magnetization in copper octacyanomolybdate.

Shin-ichi Ohkoshi1, Hiroko Tokoro, Toshiya Hozumi

  • 1Department of Applied Chemistry, School of Engineering, The University of Tokyo, 7-3-1 Hongo, Bunkyo-ku, Tokyo 113-8656, Japan. ohkoshi@light.t.u-tokyo.ac.jp

Journal of the American Chemical Society
|January 5, 2006
PubMed
Summary

This study details a photomagnetic copper-molybdenum assembly that becomes magnetized when exposed to blue light. The magnetization is reversible with specific light wavelengths, demonstrating potential for light-controlled magnetic materials.

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Area of Science:

  • Materials Science
  • Solid-State Chemistry
  • Photochemistry

Background:

  • Cyanide-bridged bimetallic assemblies are explored for unique electronic and magnetic properties.
  • Understanding the interplay between light, electron transfer, and magnetism in coordination compounds is crucial for developing advanced materials.

Purpose of the Study:

  • To investigate the photomagnetic properties of a cyanide-bridged copper-molybdenum bimetallic assembly.
  • To characterize the light-induced electron transfer and its effect on magnetization.
  • To explore the thermal and photochemical reversibility of the photomagnetic effect.

Main Methods:

  • Synthesis and characterization of the Cu(II)(2)[Mo(IV)(CN)(8)].8H(2)O assembly.
  • Wide-angle X-ray scattering and X-ray spectroscopy for structural analysis.
  • UV-vis absorption spectroscopy and magnetization measurements under varying light irradiation and temperature.

Main Results:

  • The assembly exhibits an intervalence transfer (IT) band around 480 nm.
  • Photoirradiation with blue light induces spontaneous magnetization with a Curie temperature of 25 K.
  • The photoinduced magnetic state is thermally stable up to 100 K and photoreversible.
  • Irradiation below 520 nm induces magnetization, while light above 520 nm reduces it, accompanied by changes in the IT band.

Conclusions:

  • Light-induced electron transfer from Mo(IV) to Cu(II) generates a ferromagnetic mixed-valence state.
  • The system demonstrates reversible switching between magnetic states using specific light wavelengths.
  • This photomagnetic behavior highlights the potential of such bimetallic assemblies for applications in switchable magnetic materials.