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Synthesis and Photophysical Properties of T-Shaped Coinage-Metal Complexes
George Kleinhans1,2, Alan K-W Chan3, Ming-Yi Leung3
1Chemistry Department, University of Pretoria, Private X20, Hatfield, 0028, South Africa.
Chemistry (Weinheim an Der Bergstrasse, Germany)
|March 18, 2020
Summary
This study explores T-shaped coinage metal complexes with a CNC pincer ligand, revealing new silver and gold complexes with tunable photophysical properties. The gold complexes exhibit green emissions, with linear gold(I) showing enhanced phosphorescence.
Area of Science:
- Coordination Chemistry
- Photophysics
- Organometallic Chemistry
Background:
- T-shaped coinage metal complexes are of interest for their unique electronic and photophysical properties.
- Pincer ligands, such as bis(mesoionic carbene)carbazolide (CNC), offer robust coordination environments for metal centers.
- Exploring d10 metal complexes (Cu, Ag, Au) with CNC ligands can lead to novel materials with tailored luminescence.
Purpose of the Study:
- To synthesize and characterize a series of T-shaped coinage d10 metal complexes supported by a CNC pincer ligand.
- To investigate the photophysical properties, including fluorescence and phosphorescence, of these new complexes.
- To explore post-complexation modifications of gold complexes to access different geometries and oxidation states.
Main Methods:
- Synthesis of T-shaped Cu(I), Ag(I), and Au(I) complexes with a CNC pincer ligand.
- Characterization of the complexes using spectroscopic and crystallographic techniques.
- Photophysical measurements (emission spectra, quantum yields, decay lifetimes) under varying temperatures.
Main Results:
- A rare tridentate T-shaped Ag(I) complex was successfully synthesized.
- Post-complexation modification yielded a linear cationic Au(I) complex and a square planar cationic Au(III)-F complex.
- Emissions ranged from blue (Cu(I)) to orange (Ag(I)), with green emissions observed for all three gold complexes.
- The linear Au(I) complex exhibited a higher quantum yield and longer decay lifetime, indicating greater phosphorescence.
Conclusions:
- The CNC pincer ligand effectively supports T-shaped geometries in coinage metal complexes.
- The synthesized complexes display diverse photoluminescent properties, tunable by metal choice and complex structure.
- Post-complexation modifications offer a pathway to access complexes with distinct geometries and oxidation states, further expanding their potential applications.
Keywords:
1,2,3-triazol-5-ylidenesT-shaped geometriesabsorption and emission propertiescoinage metalspincer complexesMore Related Videos
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