An Unprecedented Octadecanuclear Copper(II) Pyrazolate–Phosphonate Nanocage: Synthetic, Structural, Magnetic, and Mechanistic Study

A novel octadecanuclear copper pyrazolate–phosphonate nanocage with a bowl-shaped arrangement of the copper­(II) centers in the asymmetric unit is reported. Characterization of intermediates in both solid and solution states aids to propose the mechanism of such a giant aggregation. Magnetic studies affirm the presence of antiferromagnetic interactions between the adjacent copper­(II) centers. Extensive supramolecular interactions result in a framework structure.