[M(L)2(NCS)2(H2O)2] (M = MnII or CoII and L=2,5-bis(4-pyridyl)-1,3,4-oxadiazole):: three-dimensional extended networks built from hydrogen bonds and π-π stacking interaction -: syntheses and crystal structures

Two three-dimensional (3D) supramolecular compounds of the general formula [M(L)(2)(NCS)(2)(H2O)(2)], where M is Mn-II or Co-II and L is 2,5-bis(4-pyridyl)-1,3,4-oxadiazole), have been synthesized and structurally determined by X-ray diffraction analyses. The crystal structures of both complexes reveal that they are isomorphic neutral molecules and the metal ions are at the center of symmetry. Each metal center is six-coordinated and the MN4O2 coordination sphere can be considered as an octahedron. The most striking feature of both complexes resides in the formation of a 3D network through hydrogen bonds and pi-pi stacking co-effection. (C) 2002 Elsevier Science B.V. All rights reserved.