Bis[3-(pyrazin-2-yl)-5-(pyridin-2-yl-κN)-1,2,4-triazol-1-ido-κN¹]copper(II)

In the mononuclear title complex, [Cu(C₁₁H₇N₆)₂], the Cu^II atom lies on a crystallographic inversion centre and is coordinated by four N atoms from two bidentate chelate monoanionic 3-(pyrazin-2-yl)-5-(pyridin-2-yl-1,2,4-triazol-1-ido ligands, two from the triazolide rings [Cu—N = 1.969 (2) Å] and two from the pyridine rings [Cu—N = 2.027 (2) Å], giving a slightly distorted square-planar geometry.

Bis(2-amino-5-methyl-1,3,4-thia­diazole-κN³)dichloridocobalt(II)

In the monomeric title complex, [CoCl₂(C₃H₅N₃S)₂], the Co^II atom is tetra­coordinated by two chloride anions and two N atoms from two monodentate 2-amino-5-methyl-1,3,4-thia­diazole ligands, giving a slightly distorted tetra­hedral stereochemistry [bond angle range about Co = 105.16 (12)–112.50 (10)°]. In the complex, the dihedral angle between the 1,3,4-thia­diazole planes in the two ligands is 72.8 (1)°. There are two intra­molecular N—H...Cl inter­actions in the complex unit, while in the crystal, inter­molecular N—H...N and N—H...Cl hydrogen bonds link these units into a two-dimensional layered structure parallel to (011).

Bis[4-amino-3,5-bis­(pyridin-2-yl)-4H-1,2,4-triazole-κ²N¹,N⁵]diaqua­cobalt(II) bis­(perchlorate)

In the title structure, [Co(C₁₂H₁₀N₆)₂(H₂O)₂](ClO₄)₂, the Co^II atom lies on an inversion centre and is coordinated in a slightly distorted octa­hedral geometry by four N atoms from two 4-amino-3,5-bis­(pyridin-2-yl)-4H-1,2,4-triazole (adpt) ligands in equatorial positions and two O atoms from two water mol­ecules in axial positions. An intra­molecular N—H...N inter­action stabilizes the mol­ecular conformation. Inter­molecular N—H...O and O—H...O inter­actions involving the perchlorate counter-anions extend the monomeric compound into a two-dimensional network parallel to the bc plane.