Two 2,5-bis(2-pyridinyl)-1,3,4-oxadiazole-metal complexes (M = Cu and Ni)

The reaction of the diazine ligand 3,5-bis(2-pyridinyl)-1,3,4-oxadiazole (p od, C12H8N4O), with Cu(CF3SO3)(2) or Ni(ClO4)(2) afforded the title complex es diaquabis[3,5-bis(2-pyridinyl)1,3,4-oxadiazole-N-2,N-3]copper(II) bis(tr ifluoromethanesulfonate), [Cu(pod)(2)(H2O)(2)](CF3SO3)(2), and diaquabis[3, 5-bis(2-pyridinyl)-1,3,4-oxadiazole-N-2,N-3]nickel(II) diperchlorate, [Ni(p od)(2)(H2O)(2)](ClO4)(2). Both complexes present a crystallographically cen trosymmetric mononuclear cation structure which consists of a six-coordinat ed Cu-II or Ni-II ion with two pod molecules acting as bidentate ligands an d two axially coordinated water molecules.