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Extended π-Conjugation and iClick Turn-on of Phosphorescence
Nicholas J Campbell1, Sohel Ahmed2, Habtom B Gobeze2
1Department of Chemistry, Center for Catalysis, University of Florida, P.O. Box 117200, Gainesville, Florida 32611, United States.
Inorganic Chemistry
|October 31, 2025
Summary
New digold(I) complexes with polycyclic aromatic hydrocarbon (PAH) ligands show unique luminescence. Inorganic click chemistry enabled synthesis, revealing enhanced charge-transfer and dual emission for advanced luminescent materials.
Area of Science:
- Organometallic Chemistry
- Materials Science
- Photophysics
Background:
- Gold(I) complexes are known for unique photophysical properties due to aurophilic bonding.
- Tuning these properties requires novel ligand design and understanding structure-property relationships.
Purpose of the Study:
- To synthesize and characterize new digold(I) triazolate complexes with polycyclic aromatic hydrocarbon (PAH) substituents.
- To investigate the impact of PAH ligands and gold-gold interactions on the photophysical properties of these complexes.
Main Methods:
- Synthesis of digold(I) triazolate complexes using inorganic click (iClick) chemistry.
- Incorporation of naphthalene, anthracene, and pyrene as PAH substituents.
- Characterization using UV-visible absorption and emission spectroscopy.
Main Results:
- Digold(I) complexes exhibited dual emission and phosphorescence, unlike mononuclear analogues.
- Increased π-conjugation of PAH ligands led to bathochromic shifts and vibronic progression.
- Enhanced ligand-to-metal and metal-to-ligand charge-transfer character was observed in digold(I) species.
Conclusions:
- Digold(I) complexes with PAH ligands display significantly altered optical behavior.
- Gold-gold interactions and ligand design are crucial for modulating luminescence.
- These findings expand the possibilities for designing novel luminescent organometallic materials.
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