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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—H...O and O—H...N hydrogen bonds helps to stabilize the crystal packing.

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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—H...N 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—H...N and N—H...S hydrogen bonds result in a three-dimensional network structure.
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