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Strongly emitting Ge(II) imide complexes.

Alina A Kryuchenkova1, Vasily A Ilichev1, Roman V Rumyantsev1

  • 1G.A. Razuvaev Institute of Organometallic Chemistry of Russian Academy of Sciences, Tropinina str. 49, Nizhny Novgorod 603137, Russia. dodonov@iomc.ras.ru.

Dalton Transactions (Cambridge, England : 2003)
|October 28, 2025
PubMed
Summary
This summary is machine-generated.

The first germanium(II) imide dimers display efficient mixed metal-centered/ligand-to-metal charge-transfer phosphorescence. These novel materials show promise for luminescent thermometry and organic light-emitting diodes (OLEDs).

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Area of Science:

  • Inorganic Chemistry
  • Materials Science
  • Photochemistry

Background:

  • Germanium(II) compounds are explored for their unique electronic properties.
  • Phosphorescence in molecular emitters is crucial for optoelectronic applications.
  • Developing efficient emitters with tunable photophysical properties remains a key challenge.

Purpose of the Study:

  • To synthesize and characterize the first germanium(II) imide dimers.
  • To investigate their photoluminescence properties in solid-state and solution.
  • To explore their potential applications in luminescent thermometry and OLEDs.

Main Methods:

  • Synthesis of germanium(II) imide dimers with specific aryl substituents.
  • Photoluminescence spectroscopy to determine quantum yields and lifetimes.
  • Temperature-dependent emission studies.
  • Computational analysis (DFT) to elucidate the phosphorescence mechanism.

Main Results:

  • The synthesized dimers exhibit efficient mixed metal-centered/ligand-to-metal charge-transfer phosphorescence.
  • High absolute photoluminescence quantum yields were achieved (up to 76.0% in crystals).
  • Emission intensity and lifetime increase with decreasing temperature, indicating thermometric potential.
  • Halogenation influenced solid-state emission through distinct packing motifs.

Conclusions:

  • The first Ge(II) imide dimers represent a new class of efficient phosphorescent materials.
  • Their temperature-dependent emission characteristics suggest suitability for luminescent thermometry.
  • The findings open avenues for designing novel germanium-based emitters for OLEDs and other optoelectronic devices.