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Alkynylgold(I) C3 -Chiral Concave Complexes: Aggregation and Luminescence
Jing Zhang1, Astrid Schaly2, Jean-Claude Chambron1,2
1Institut de Chimie de Strasbourg, UMR 7177 CNRS, Université de Strasbourg, 1, rue Blaise Pascal, BP 296 R8, 67008, Strasbourg, France.
Chemistry (Weinheim an Der Bergstrasse, Germany)
|December 28, 2021
Summary
Chiral gold(I) complexes show aggregation-induced emission (AIE) in specific solvents, shifting from blue phosphorescence to green fluorescence. This aggregation-induced luminescence is linked to gold-gold interactions and can distinguish between enantiomers and racemates.
Area of Science:
- Coordination Chemistry
- Materials Science
- Photophysics
Background:
- Chiral gold(I) complexes are investigated for their luminescent properties.
- Cyclotribenzylene scaffolds offer unique structural platforms for metal complexes.
- Understanding aggregation-induced emission (AIE) is crucial for developing new luminescent materials.
Purpose of the Study:
- To synthesize and characterize chiral gold(I) acetylide trinuclear complexes.
- To investigate the photophysical properties, including phosphorescence and fluorescence, of these complexes in various solvents.
- To explore the aggregation-induced emission (AIE) behavior and its relationship with molecular aggregation and chirality.
Main Methods:
- Synthesis and characterization of gold(I) acetylide trinuclear complexes.
- Photoluminescence spectroscopy (phosphorescence and fluorescence) in solution and solid state.
- Dynamic Light Scattering (DLS) to study aggregate formation.
- Chiral analysis to differentiate enantiomers and racemates.
Main Results:
- Complexes 1-3 exhibited blue phosphorescence in CHCl3 and UV fluorescence.
- In MeOH/CHCl3 mixtures, complexes 1 and 2 showed green emission (ca. 540 nm) due to aggregation (30-80 nm).
- Aggregation-induced emission (AIE) was observed, potentially from Au···Au interactions, and chiral analysis revealed differences between enantiomers and racemates.
Conclusions:
- The observed green emission in mixed solvents is aggregation-induced and linked to Au···Au interactions.
- Chiral gold(I) complexes display distinct AIE profiles for enantiomers versus racemates, confirming the racemate's nature.
- These findings contribute to the design of chiral luminescent materials with tunable aggregation-dependent properties.
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