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Novel luminescent tetranuclear and pentanuclear copper(I)-dithiolates
1Department of Chemistry, The National University of Singapore, 10 Kent Ridge Crescent, 119269, Singapore.
Inorganic Chemistry
|July 23, 2003
Summary
New copper complexes with unique tetranuclear and pentanuclear cores were synthesized. These novel compounds exhibit dual emissions, originating from distinct electronic transitions within the molecules.
Area of Science:
- Inorganic Chemistry
- Coordination Chemistry
- Materials Science
Background:
- Copper complexes are crucial in catalysis and materials science.
- Bis(diphenylphosphino)methane (dppm) is a common ligand in coordination chemistry.
- 1,8-naphthalenedithiolate (NS(2)(2-)) is a versatile ligand for metal complexation.
Purpose of the Study:
- To synthesize novel tetranuclear and pentanuclear copper complexes.
- To characterize the structures and electronic properties of the synthesized complexes.
- To investigate the luminescent behavior of the new copper compounds.
Main Methods:
- Reaction of 1,8-naphthalenedithiolate (NS(2)(2-)) with a copper-dppm precursor.
- X-ray crystallography for structural determination of the copper complexes.
- Photoluminescence spectroscopy to analyze emission properties.
Main Results:
- Synthesis of tetranuclear [Cu(4)(dppm)3(NS(2)2-)] (1) and pentanuclear [Cu(5)(dppm)4(NS(2)2)2]PF6 (2.PF6).
- Compound 1 features a square Cu4 core with a sulfur cap; Compound 2.PF6 shows an unprecedented square planar Cu5 core.
- Both complexes exhibit dual emissions at 480 nm (ligand-centered npi) and 620 nm (ligand-metal charge-transfer).
Conclusions:
- Novel tetranuclear and pentanuclear copper complexes incorporating dppm and NS(2)(2-) ligands were successfully synthesized.
- The unique core structures of these complexes influence their photophysical properties.
- The observed dual emissions provide insights into the electronic excited states of these copper coordination compounds.