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Colors and Magnetism03:02

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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.
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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...
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In bromoethane, the three methyl protons are coupled to the two methylene protons that are three bonds away. In accordance with the n+1 rule, the signal from the methyl protons is split into three peaks with 1:2:1 relative intensities. The methylene protons appear as a quartet, with the relative intensities of 1:3:3:1.
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Pressure-induced spin-state transition in BiCoO3.

Kengo Oka1, Masaki Azuma, Wei-tin Chen

  • 1Institute for Chemical Research, Kyoto University, Uji, Kyoto 611-0011, Japan. oka@issp.u-tokyo.ac.jp

Journal of the American Chemical Society
|June 24, 2010
PubMed
Summary

High pressure transforms bismuth cobalt oxide (BiCoO3) structure, causing a volume decrease and electrical resistivity drop. This reveals a spin-state change in cobalt ions, crucial for understanding its electronic properties.

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Area of Science:

  • Materials Science
  • Solid-State Physics
  • Crystallography

Background:

  • Bismuth cobalt oxide (BiCoO3) exhibits complex structural and electronic properties.
  • Understanding phase transitions under pressure is key to novel material applications.

Purpose of the Study:

  • Investigate the structural and electronic behavior of BiCoO3 under high pressure.
  • Determine the pressure-induced phase transitions and associated property changes.

Main Methods:

  • Synchrotron X-ray and neutron powder diffraction were employed to analyze structural changes.
  • Electrical resistivity measurements were conducted under varying pressure conditions.
  • X-ray emission spectroscopy was used to probe electronic and spin-state transitions.

Main Results:

  • A structural phase transition from polar PbTiO3-type to centrosymmetric GdFeO3-type occurs above 3 GPa.
  • A significant volume reduction of 13% was observed at room temperature, linked to a spin-state change.
  • Electrical resistivity drops sharply during the first-order phase transition.
  • Structural data indicate a low spin state for Co(3+) at high pressures, while X-ray emission spectra suggest an intermediate spin state.

Conclusions:

  • High pressure induces a distinct structural and electronic transition in BiCoO3.
  • The observed spin-state change in cobalt ions is a critical factor in the material's response to pressure.
  • The constructed pressure-temperature phase diagram provides insights into the material's stability and transition temperatures.