metal-organic compounds
The title complex, (C3H5N2)2[Co(C7H3NO4)2(H2O)2]·4H2O, was prepared by a hydrothermal reaction. Each CoII atom is located on a crystallographic inversion centre and displays a distorted octahedral coordination geometry. The face-to-face distance of 3.529 (7) Å between partially overlapped parallel pyridine rings reflects a π–π stacking interaction between neighbouring CoII complex molecules. A network of O—HO and O—HN hydrogen bonds helps to stabilize the crystal packing.
organic compounds
In the title complex, C10H8N2·2C2H3N3S2, the 4,4′-bipyridine (bpy) molecule, lying on an inversion centre, is connected to two 5-amino-1,3,4-thiadiazole-2(3H)-thione (tdz) molecules through N—HN hydrogen bonds. The tdz planes are slightly twisted with respect to the bpy plane, with a dihedral angle of 2.1 (2)°. Further intermolecular N—HN and N—HS hydrogen bonds result in a three-dimensional network structure.