Structural Packing Features of [ML2](ReO4)2 (M = Cu, Ni; L = 5,5,7,12,12,14-Hexamethyl-1,4,8,11-Tetraaza-Cyclotetradecane)

The crystal structures of [CuL2](ReO4)2 and [NiL2](ReO4)2 (L = 5,5,7,12,12,14-hexamethyl-1,4,8,11-tetraaza-cyclotetradecane) are studied. The crystal structural data for [CuL2](ReO4)2, C16H32CuN4O8Re2: a = 13.5523(7) A, b = 9.3446(4) A, c = 18.4410(9) A, V = 2335.38(19) A3, space group Pbca, Z = 4, dx = 2.402 g/cm3; the copper atom coordination C–N of (2×)1.973(5) A and (2×)2.008(5) A, the additional coordination Cu…O of (2×)2.642 A. The crystal structural data for [NiL2](ReO4)2, C16H32NiN4O8Re2: a = 8.9308(2) A, b = 14.3479(3) A, c = 18.6501(4) A, β = 91.492(1)°, V = 2388.98(9) A3, space group P21/c, Z = 4, dx = 2.334 g/cm3; the nickel atom coordination Ni–N of 1.889(4)-1.917(3) A, the additional coordination Ni…O of 2.750(3) A.