First CuII diamondoid net with 2-fold interpenetrating frameworks.: The role of anions in the construction of the supramolecular arrays

The synthesis and crystal structure of the three-dimensional coordination polymer of an angular dipyridyl ligand 2,5-bis(4-pyridyl)-1,3,4-oxadiazole (L) and Cu(ClO4)(2), exhibiting the first Cu-II diamondoid network with 2-fold interpenetration, {[Cu(L)(2)(H2O)(2)](ClO4)(OH)(H2O)(2.5)}(n) (1), together with the Cu(OAc)(2) complex of L, [Cu(L)(2)(OAc)(2)-(H2O)](H2O)(2)(CH3OH) (2), with an unexpected mononuclear structure, are reported. Crystal data for 1: tetragonal, space group l4(1)/a, a = b = 13.477(3) Angstrom, c = 46.167(13) Angstrom, Z = 8. Crystal data for 2: triclinic, space group P (1) over bar, a = 7.847(2) Angstrom, b = 13.189(4) Angstrom, c = 15.948(5) Angstrom, alpha = 75.225(7)degrees, beta = 79.945(6)degrees, gamma = 77.540(5)degrees, Z = 2. The magnetic properties and anion effect are also discussed.