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Multicolor photoluminescence of Cu14 clusters modulated using surface ligands
Arijit Jana1, Subrata Duary1, Amitabha Das2
1DST Unit of Nanoscience (DST UNS), Thematic Unit of Excellence (TUE), Department of Chemistry, Indian Institute of Technology, Madras Chennai 600036 India pradeep@iitm.ac.in.
Chemical Science
|August 30, 2024
Summary
This study shows how modifying copper nanoclusters with different ligands, like dimethylformamide (DMF), changes their multicolor luminescence. Ligand engineering dynamically tunes the emissive excited states of these nanoclusters.
Area of Science:
- Materials Science
- Nanotechnology
- Photochemistry
Background:
- Copper nanoclusters possess unique structures and tunable photoluminescence.
- Controlling their surface chemistry is key to tailoring optical properties.
Purpose of the Study:
- To investigate ligand-dependent multicolor luminescence in a Cu14 cluster.
- To explore the effect of N,N-dimethylformamide (DMF) and DPPE ligands on copper nanocluster emission.
Main Methods:
- Synthesis of Cu14 clusters protected by ortho-carborane-9,12-dithiol (o-CBDT).
- Crystallization with DMF and characterization using single-crystal X-ray diffraction (SCXRD).
- Synthesis of 1D assemblies using DPPE linkers and luminescence spectroscopy.
Main Results:
- Cu14 clusters coordinated with DMF exhibited red luminescence (singlet state).
- 1D assemblies with DPPE linkers showed greenish-yellow phosphorescence (triplet state).
- Ligand engineering significantly altered the emissive excited states and luminescence color.
Conclusions:
- The surface of copper nanoclusters can be dynamically tuned by ligand engineering.
- This provides a pathway for controlling multicolor luminescence in nanomaterials.
- Theoretical calculations supported the observed electronic transitions and energy levels.
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