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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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The energy gap law for NIR-phosphorescent Cr(III) complexes.

Yang Cheng1, Qingqing Yang1, Jiang He1

  • 1Department of Chemistry, Southern University of Science and Technology, Shenzhen, Guangdong 518055, P. R. China. luw@sustech.edu.cn.

Dalton Transactions (Cambridge, England : 2003)
|November 10, 2022
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New chromium(III) complexes with unique ligands exhibit near-infrared phosphorescence. The energy gap law effectively describes their excited state behavior, paving the way for novel photoluminescent materials.

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Area of Science:

  • Inorganic Chemistry
  • Photochemistry
  • Materials Science

Background:

  • Chromium(III) complexes are known for their diverse coordination chemistry and potential applications.
  • Phosphorescence in metal complexes is of interest for lighting and sensing technologies.
  • Near-infrared emitting materials are crucial for advanced optical applications.

Purpose of the Study:

  • To synthesize and characterize novel homoleptic chromium(III) complexes.
  • To investigate the photophysical properties, specifically phosphorescence, of these complexes.
  • To explore the applicability of the energy gap law to the excited states of these Cr(III) systems.

Main Methods:

  • Synthesis of homoleptic Cr(III) complexes featuring substituted anionic 1,3-bis(pyridin-2-ylimino)isoindolin-2-ide ligands.
  • Spectroscopic characterization including UV-Vis absorption and emission spectroscopy.
  • Photoluminescence quantum yield and lifetime measurements in degassed fluid solutions.

Main Results:

  • The synthesized Cr(III) complexes display strong phosphorescence with emission maxima (λmax) in the near-infrared region (777-970 nm).
  • The observed phosphorescence originates from doublet excited states.
  • Successful application of the energy gap law to rationalize the photophysical behavior of these complexes.

Conclusions:

  • Homoleptic Cr(III) complexes with 1,3-bis(pyridin-2-ylimino)isoindolin-2-ide ligands are efficient near-infrared phosphors.
  • The energy gap law provides a valid framework for understanding the photophysics of these Cr(III) excited states.
  • These findings contribute to the development of new near-infrared emitting materials for various technological applications.