An Octanuclear Helical 'Molecular Wheel' From Hierarchical Assembly Of Four Dinuclear Cu-2 Units In A Mixed-Ligand Array

Reaction of Cu(II) salts with a combination of two different types of ligand affords an unusual 'molecular wheel', based on a cyclic array of four pyrazolate-bridged dinuclear Cu(II) units which are interconnected by bis-bidentate bridging ligands, in a hierarchical self-assembly process.