Tetra­kis[μ-2-(meth­oxy­carbon­yl)benzoato-κ²O¹:O^1′]bis­[(acetonitrile-κN)copper(II)](Cu—Cu)

In the binuclear copper(II) title complex, [Cu₂(C₉H₇O₄)₄(C₂H₃N)₂], an inversion centre is situtated at the mid-point of the Cu—Cu bond. The Cu^II atom together with its four coordinated O atoms are in a distorted planar square arrangement while the nitro­gen and the other Cu^II atom are located in apical positions. The whole mol­ecule looks like a paddle-wheel. In the crystal, chains are assembled along the b axis through C—H...O hydrogen bonds and slipped π–π inter­actions between the benzene rings of neighbouring mol­ecules [centroid–centroid distance = 3.6929 (3) Å and slippage = 0.641 (1) Å].

3,22-Dioxa-11,14-di­aza­penta­cyclo­[12.8.0.0^2,11.0^5,10.0^15,20]docosa-5(10),6,8,15(20),16,18-hexa­ene-4,21-dione

In the title compound, C₁₈H₁₄N₂O₄, the piperazine ring adopts a chair conformation and the dihedral angle between the aromatic rings is 13.09 (9)°. In the crystal, mol­ecules are linked along the c axis by C—H...π and N...π [H(N)–centroid distances = 2.8030 (2) and 3.376 (2) Å] inter­actions between neighbouring mol­ecules.