Crystal structure of diaqua-bis(pyridine-2,6-dicarboxylato-O,N,O')-(μ2- pyrazino)dicopper(II) dihydrate, [Cu2(C4H4N2)(C7H3NO4)2(H2O)2] · 2H20

C 18 H 18 Cu 2 N 4 O 12 , monoclinic, P12 1 /n1 (no. 14), a = 5.808(1) A, b = 15.541(3) A, c = 11.962(3) A, β = 92.79(3)°, V = 1078.3 A 3 , Z = 2, R gt (F) = 0.028, wR ref (F 2 ) = 0.079, T = 293 K.