A dodecanuclear copper(II) cage self-assembled from six dicopper building units

Area of Science:

• Coordination Chemistry
• Supramolecular Chemistry
• Materials Science

Background:

• Phenol-based ligands are versatile building blocks in coordination chemistry.
• Self-assembly of metal ions into complex architectures is a key area of research.
• Understanding magnetic coupling in polynuclear complexes is crucial for developing molecular magnets.

Purpose of the Study:

• To synthesize and characterize a novel {Cu12} coordination complex.
• To investigate the self-assembly of copper ions directed by a phenol-based ligand.
• To explore the structural and magnetic properties of the resulting complex.

Main Methods:

• Reaction of H3bpmp ligand with Cu(2+) ions in the presence of a hybrid base (NEt3 and NaN3).
• Crystallization and X-ray structure determination of the {Cu12} complex.
• Magnetic susceptibility measurements and Density Functional Theory (DFT) calculations.

Main Results:

• Formation of a novel NO3(-) capped and HO(-) supported {Cu12} coordination complex with a cuboctahedral geometry.
• The H3bpmp ligand acts as a face-capping agent, facilitating the formation of the coordination cage.
• Strong antiferromagnetic coupling (J/kB = -173 K) was observed and rationalized by DFT calculations.

Conclusions:

• The study demonstrates the successful synthesis of a unique {Cu12} coordination cage with interesting structural features.
• The H3bpmp ligand plays a critical role in directing the self-assembly process.
• The observed magnetic properties highlight the potential for designing new magnetic materials based on such coordination architectures.