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Related Concept Videos

Photoluminescence: Applications01:14

Photoluminescence: Applications

387
Photoluminescence offers a wide range of applications due to its inherent sensitivity and selectivity. This technique allows for both direct and indirect analyses of the analyte. Direct quantitative analysis is possible when the analyte exhibits a favorable quantum yield for fluorescence or phosphorescence. However, an indirect analysis may be feasible if the analyte is not fluorescent or phosphorescent, or if the quantum yield is unfavorable. Indirect methods include reacting the analyte with...
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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...
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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,...
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Crystal Field Theory
To explain the observed behavior of transition metal complexes (such as colors), a model involving electrostatic interactions between the electrons from the ligands and the electrons in the unhybridized d orbitals of the central metal atom has been developed. This electrostatic model is crystal field theory (CFT). It helps to understand, interpret, and predict the colors, magnetic behavior, and some structures of coordination compounds of transition metals.
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Chromic soft crystals based on luminescent platinum(II) complexes.

Masako Kato1

  • 1Department of Applied Chemistry for Environment, Kwansei Gakuin University, 1 Gakuen Uegahara, Sanda, Hyogo 669-1330, Japan.

Iucrj
|June 11, 2024
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Platinum(II) complexes with square-planar geometry exhibit tunable luminescence. Crystal design strategies enable chromic luminescence in response to stimuli like vapor or mechanical force.

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Area of Science:

  • Materials Science
  • Inorganic Chemistry
  • Crystallography

Background:

  • Square-planar Platinum(II) complexes display strong luminescence.
  • Luminescence properties are sensitive to molecular self-assembly and crystal packing.
  • Stimuli-responsive chromic luminescence is a key feature.

Purpose of the Study:

  • To review strategies for fabricating chromic luminescent Platinum(II) complexes.
  • To focus on crystal design principles for controlling luminescence.
  • To present research progress and future potential.

Main Methods:

  • Crystal engineering approaches for soft crystals.
  • Structural regulation of Platinum(II) complexes via metal-metal interactions.
  • Utilizing cations for structural control of anionic Platinum(II) complexes.

Main Results:

  • Demonstrated assembly-induced luminescence in Platinum(II) complexes.
  • Showcased stimuli-responsive chromic luminescence phenomena.
  • Highlighted the critical role of molecular and crystal design.

Conclusions:

  • Crystal design is crucial for developing chromic luminescent Platinum(II) complexes.
  • Metal-metal interactions and cation control are effective strategies.
  • The field shows significant potential for future advancements.