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A Luminescent Gold Ring That Flips Like Cyclohexane.
John H K Yip1, Janardhana Prabhavathy1
1Department of Chemistry The National University of Singapore 10 Kent Ridge Crescent, 119260 (Singapore) Fax: (+65) 7791691.
Angewandte Chemie (International Ed. in English)
|May 2, 2018
Summary
A trinuclear gold ring complex ([Au3(PAnP)3][ClO4]3) mimics cyclohexane's chair conformation and ring inversion dynamics in solution. This gold ring also displays strong excimeric emission, highlighting its unique photophysical properties.
Area of Science:
- Organometallic chemistry
- Supramolecular chemistry
- Photochemistry
Background:
- Cyclohexane's chair conformation and ring inversion are fundamental concepts in organic chemistry.
- Trinuclear metal complexes offer unique structural and electronic properties.
- Anthracene-based phosphine ligands can stabilize multinuclear metal centers.
Purpose of the Study:
- To synthesize and characterize a trinuclear gold ring complex with a chair conformation.
- To investigate the dynamic behavior of the gold ring in solution using NMR spectroscopy.
- To explore the photophysical properties, specifically excimeric emission, of the gold complex.
Main Methods:
- Synthesis of the trinuclear gold complex [Au3(PAnP)3][ClO4]3 using 9,10-bis(diphenylphosphino)anthracene (PAnP) ligand.
- Variable temperature and 2D EXSY NMR spectroscopy to study ring inversion dynamics.
- Spectroscopic analysis to characterize the emission properties.
Main Results:
- The gold complex [Au3(PAnP)3][ClO4]3 adopts a chair conformation, analogous to cyclohexane.
- NMR studies confirmed cyclohexane-like ring inversion (enantiomerization) of the gold ring in solution.
- The complex exhibits intense excimeric emission at room temperature.
Conclusions:
- The study demonstrates a novel trinuclear gold ring with dynamic conformational behavior similar to cyclohexane.
- The findings provide insights into the structural flexibility and solution dynamics of multinuclear gold complexes.
- The observed excimeric emission suggests potential applications in materials science and photochemistry.
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