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Toward Heteronuclear Molecular Re(I)-Cu(II) Boxes: Structural, Luminescent, and Magnetic Properties
Biing-Chiau Tzeng1, Wen-Hui Chen1, Geng-Hui Song1
1Department of Chemistry and Biochemistry, National Chung Cheng University, 168 University Rd., Min-Hsiung, Chiayi 62102, Taiwan.
ACS Omega
|December 13, 2021
Summary
This study synthesizes novel rhenium-copper heteronuclear molecular boxes using bifunctional ligands. These complexes exhibit interesting luminescence and magnetic properties, showcasing a versatile complex-as-a-ligand strategy.
Area of Science:
- Coordination Chemistry
- Supramolecular Chemistry
- Materials Science
Background:
- Polypyridine ligands are common in coordination chemistry.
- Bifunctional ligands offer alternative routes to complex structures.
- Rhenium and copper complexes are of interest for their photophysical and magnetic properties.
Purpose of the Study:
- To synthesize novel trinuclear and multinuclear rhenium-copper complexes.
- To investigate the structural diversity and self-assembly of these complexes.
- To explore the luminescence and magnetic properties of the synthesized compounds.
Main Methods:
- Reaction of (Re(CO)3)3(C3N3S3) with isonicotinic acid and 4-pyrid-4-ylbenzoic acid.
- Deprotonation and reaction with copper(II) nitrate to form heteronuclear complexes.
- Synthesis of a rare octadecanuclear complex by addition of pyrazine.
- Characterization of structural, luminescent, and magnetic properties.
Main Results:
- Formation of trinuclear complexes 1 and 2 with trigonal-prismatic and antiprismatic structures.
- Synthesis of nonanuclear (3) and octadecanuclear (4) heteronuclear Re(I)-Cu(II) boxes.
- Complexes 1 and 2 show low-energy luminescence at 561 and 534 nm.
- Complex 3 exhibits antiferromagnetic coupling, suggesting significant Cu(II)···Cu(II) interactions.
Conclusions:
- Bifunctional ligands enable the construction of complex supramolecular architectures.
- The complex-as-a-ligand strategy is effective for creating heteronuclear molecular boxes.
- The synthesized complexes display tunable luminescence and magnetic behaviors.
- Hydrogen bonding plays a crucial role in directing supramolecular assembly and influencing magnetic coupling.
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