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Gold(I) eta2-arene complexes.

Qing-Shan Li1, Chong-Qing Wan, Ru-Yi Zou

  • 1State Key Laboratory of Elemento-Organic Chemistry, Nankai University, Tianjin 300071, China.

Inorganic Chemistry
|February 28, 2006
PubMed
Summary
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This study details novel gold(I) eta2-arene complexes. These complexes exhibit tunable fluorescence, switching from weak to strong emission upon phosphine addition, indicating potential in responsive materials.

Area of Science:

  • Organometallic Chemistry
  • Coordination Chemistry
  • Photophysics

Background:

  • Anthracene-based ligands are valuable in coordination chemistry.
  • Gold(I) complexes are known for their diverse structural motifs and luminescent properties.
  • Tuning electronic properties through ligand design is crucial for developing functional materials.

Purpose of the Study:

  • To synthesize and characterize novel gold(I) eta2-arene complexes with an anthracene-containing ligand.
  • To investigate the photophysical properties, specifically fluorescence, of these new gold(I) complexes.
  • To explore the influence of ligand configuration (arm-opening vs. arm-closing) on luminescence.

Main Methods:

  • Synthesis of a novel anthracene-based phosphine ligand, 9-{[N-n-propyl-N-(diphenylphosphino)amino]methyl}anthracene (1).

Related Experiment Videos

  • Reaction of ligand 1 with gold(I) precursors (Au(SMe2)Cl) and subsequent silver salt treatment (AgClO4) to form gold(I) complexes.
  • Characterization of synthesized gold(I) complexes (2, 3a-c, 4, 5) using spectroscopic and structural methods.
  • Investigation of fluorescence properties in solution (CH2Cl2) and the effect of additives like triphenylphosphine (Ph3P).

    • Main Results:

    • Formation of gold(I) complex 2 with an arm-opening configuration.
    • Synthesis of novel gold(I) eta2-arene complexes 3a-c (arm-closing) and complex 4.
    • Complexes 3a-c exhibited weak fluorescence, attributed to charge transfer from anthracene to Au+.
    • Addition of triphenylphosphine to complex 3a or 4 restored the arm-opening configuration (complex 5) and strong fluorescence.

    Conclusions:

    • The synthesized gold(I) eta2-arene complexes display distinct arm-opening and arm-closing configurations.
    • Fluorescence emission is sensitive to the coordination geometry around the gold(I) center.
    • Reversible switching between weak and strong fluorescence is achievable by altering the ligand's coordination mode, highlighting potential for responsive luminescent materials.