Two polyoxovanadate-based metal-organic polyhedra with undiscovered "near-miss Johnson solid" geometry

Area of Science:

• Inorganic Chemistry
• Materials Science
• Crystallography

Background:

• Polyoxovanadates are versatile clusters with diverse structures and properties.
• Metal-organic polyhedra (MOPs) offer tunable frameworks for advanced applications.
• Developing novel MOPs with unique geometries remains a key challenge.

Purpose of the Study:

• To synthesize new polyoxovanadate-based metal-organic polyhedra.
• To explore the assembly of novel molecular building blocks (MBBs).
• To characterize the resulting structures and investigate their magnetic properties.

Main Methods:

• Hydrothermal synthesis utilizing frangipani-like polyanions and V5O9Cl MBBs.
• Incorporation of tricarboxylate ligands (H3BTC).
• Single-crystal X-ray diffraction for structural determination.
• Variable-temperature magnetic susceptibility measurements.

Main Results:

• Two new polyoxovanadate-based MOPs were successfully synthesized.
• The MOPs feature an unprecedented "near-miss Johnson solid" geometry.
• The structures incorporate 5-connected [MV5O6(μ3-O)5(SO4)] and 4-connected [V5O9Cl] MBBs with BTC ligands.
• Magnetic susceptibility data were collected and analyzed.

Conclusions:

• Novel polyoxovanadate-based MOPs with unique geometries were constructed.
• The study demonstrates the utility of specific MBBs in forming complex supramolecular architectures.
• The findings expand the scope of MOPs and their potential applications in magnetism and materials science.