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Alkynylgold(I) C3 -Chiral Concave Complexes: Aggregation and Luminescence.

Jing Zhang1, Astrid Schaly2, Jean-Claude Chambron1,2

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Chemistry (Weinheim an Der Bergstrasse, Germany)
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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.

Keywords:
aggregationalkyne ligandschiralitygoldluminescence

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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.