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Area of Science:

  • Inorganic Chemistry
  • Materials Science
  • Solid-State Chemistry

Background:

  • Gold complexes with phosphine ligands are of interest due to their unique structural and photophysical properties.
  • Aurophilic interactions (Au-Au bonding) play a crucial role in the assembly and properties of gold compounds.
  • Understanding solid-state phase transitions in coordination complexes is key to developing advanced functional materials.

Purpose of the Study:

  • To synthesize and characterize novel gold(I) complexes with a specific phosphine ligand, 3-bdppmapy.
  • To investigate the solid-state phase transitions and photoluminescence properties of these gold complexes.
  • To explore the role of aurophilic interactions in driving these observed phenomena.

Main Methods:

  • Synthesis of gold(I) complexes using Au(tht)Cl and 3-bdppmapy.
  • Isolation and characterization of complexes 1-6, with independent synthesis routes for 4-6.
  • Analysis of structural changes, phase transitions, and photoluminescence using techniques including heating, solvent exposure, and density functional theory (DFT) calculations.

Main Results:

  • Six gold(I) complexes, {(3-bdppmapy)(AuCl)2}, were successfully synthesized.
  • Complexes 4-6 demonstrated reversible solid-state phase transitions between different structural forms (e.g., 4 to 5) upon thermal or solvent stimuli.
  • These transitions were accompanied by changes in solid-state fluorescence and were attributed to variations in the number and strength of aurophilic interactions.

Conclusions:

  • The synthesized gold complexes exhibit stimuli-responsive solid-state phase transitions.
  • Aurophilic interactions are critical in governing both the structural dynamics and photoluminescent behavior of these complexes.
  • The reversible nature and stable fluorescence suggest potential applications in areas like optical sensors or switches.