Copper(I) complexes with phenylphosphonous acid diamide

Copper(I) halide complexes with phenylphosphonous diamide ligand (L), C56H100Br4Cu4N8P4 (II) and C56H100Cu4I4N8P4 (III), were synthesized and studied by X-ray diffraction to determine their molecular and crystal structures (CIF files CCDC nos. 1426622 (II), 1426623 (III)). The prepared coordination compounds are cubane-like tetramers like L4Cu4X4. During the reaction, copper(I) is coordinated to the phosphorus atom of ligand L. The stability of the complexes depends considerably on the halogen atom. The iodide complexes are most stable during storage.