TETRAKIS(MU-ACETATO)BIS(2-PYRIDONE)DICOPPER

[Cu2(C5H5NO)2(C2H3O2)4], M(r) = 553.4, monoclinic, C2/c, a = 13.569 (3), b = 8.6013 (13), c = 18.564 (4) angstrom, beta = 93.541 (11)degrees, V = 2162 angstrom 3, Z = 4 (implying that each molecule lies on a twofold special position), D(x) = 1.700 Mg m-3, lambda(Mo K-alpha) = 0.71073 angstrom, mu = 2.027 mm-1, F(000) = 1128, T = 173.0 +/- 0.1 K, R = 0.0313 for 1938 unique observed reflections. The molecule lies across a crystallographic inversion centre with the Cu-Cu vector of 2.6183 (8) angstrom bridged by four acetate groups and with the pyridone ligands in axial positions. N-H...O hydrogen bonding between pyridone ligands links the molecules into infinite chains running parallel to c and pyridyl rings from neighbouring chains stack parallel to b.