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Gold(I)-dithioether supramolecular polymers: synthesis, characterization, and luminescence.
Mohamed Osman Awaleh1, François Baril-Robert, Christian Reber
1Institut des Sciences de la Terre, Centre d'Etudes et de Recherches Scientifiques de Djibouti (CERD), B.P. 486, Djibouti, Republic of Djibouti.
Inorganic Chemistry
|March 28, 2008
Summary
Researchers synthesized novel gold(I) complexes and supramolecular polymers using dithioether building blocks. These compounds exhibit unique structures, including one-dimensional chains and two-dimensional networks, driven by aurophilic interactions.
Area of Science:
- Coordination Chemistry
- Supramolecular Chemistry
- Materials Science
Background:
- Dithioether ligands are versatile building blocks in coordination chemistry.
- Aurophilic interactions play a crucial role in the self-assembly of gold(I) complexes.
- Understanding structure-property relationships in gold complexes is key for materials development.
Purpose of the Study:
- To synthesize and characterize novel discrete gold(I) compounds and supramolecular polymers.
- To investigate the role of dithioether ligands in self-assembly and structural organization.
- To explore the photophysical properties, including luminescence, of the synthesized gold complexes.
Main Methods:
- Self-assembly of dithioether building blocks with HAuCl4·3H2O.
- Structural characterization of discrete complexes and supramolecular polymers.
- UV-vis spectroscopy and solid-state luminescence measurements at low temperatures (5 K).
Main Results:
- Synthesis of various gold(I) complexes and supramolecular polymers, including 1D polymers and 2D networks.
- Observation of significant aurophilic interactions ([Au-Au-](infinity) chains) in several complexes.
- Identification of polymorphs and molecular complexes, demonstrating structural diversity.
- UV-vis spectra show allowed ligand-centered transitions between 230-260 nm.
- Solid-state luminescence observed in complexes 1, 2, and 6 at 5 K, with vibronic progressions.
Conclusions:
- Dithioether ligands effectively direct the self-assembly of gold(I) complexes into diverse supramolecular architectures.
- Aurophilic interactions are critical in forming extended [Au-Au-](infinity) chains in 1D and 2D supramolecular structures.
- The synthesized gold(I) complexes exhibit interesting photophysical properties, including luminescence, suggesting potential applications in materials science.
