μ1,3-Azido-diazidotetrakis(1,10-phenanthroline)dicopper(II) azide tetrahydrate

In the title compound, [Cu2(mu-(1,3)-N3)(N3)2(phen)4](N3)*4H2O (phen is 1,10-phenanthroline, C12H8N2), each of the two Cu atoms is surrounded by two N atoms of two azide anions and by four N atoms of two 1,10-phenanthroline ligands [Cu-N distances are 1.964 (3), 2.009 (3), 2.018 (3), 2.054 (3), 2.306 (3) and 2.759 (4) A], forming an elongated CuN6 octahedron. An ideally linear mu(1,3)-azide anion bridges two Cu atoms to form a dimeric structure with the central N atom located on a centre of inversion. Moreover, the adjacent dimeric units are connected by hydrogen-bond interactions to produce one-dimensional chains. A two-dimensional supramolecular array is formed by pi-pi interactions between the aromatic rings of 1,10-phenanthroline ligands of adjacent dimeric units.