A trigonal prismatic Cu6-pyrazolato complex containing a μ6-F ligand

Area of Science:

• Coordination chemistry
• Supramolecular chemistry
• Inorganic chemistry

Background:

• Copper-pyrazolato complexes can form cage structures.
• Fluoride ions can be encapsulated within coordination cages.
• The coordination environment of encapsulated ions influences host properties.

Purpose of the Study:

• To investigate the structural, electronic, and magnetic effects of encapsulating a fluoride ion in a Cu6-pyrazolato cage.
• To compare the properties of the fluoride-encapsulated complex with the parent vacant cage complex.
• To explore the rare μ6-F coordination mode.

Main Methods:

• Synthesis of Cu6-pyrazolato cage complexes.
• Single-crystal X-ray diffraction for structural analysis.
• Spectroscopic techniques (UV-Vis, EPR) for electronic properties.
• Magnetic susceptibility measurements.

Main Results:

• Encapsulation of a fluoride ion caused a slight expansion of the Cu6 host cage.
• The fluoride ion adopted a rare μ6-F coordination mode within the cage.
• Differences in structural, electronic, and magnetic properties were observed between the encapsulated and vacant complexes.

Conclusions:

• Fluoride ion encapsulation in Cu6-pyrazolato cages is feasible.
• The encapsulated fluoride influences the host's structural and electronic characteristics.
• This work provides insights into host-guest chemistry in coordination cages.