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The title compound, C(10)H(10)N(8), resides on a crystallographic symmetry center and features an essentially planar mol-ecule [r.m.s. deviation = 0.278 (1) Å]. In the C=N-N=C fragment, the C=N distance is 1.3017 (18) Å and the N-N distance is 1.403 (2) Å. In the crystal, adjacent mol-ecules are linked by N-H⋯N hydrogen bonds into a three-dimensional network.

In the title compound, [Zn(C(7)H(4)FO(2))(2)(C(5)H(6)N(2))(2)] or [Zn(fa)(2)(2-pa)(2)] (Hfa is 2-fluoro-benzoic acid and 2-pa = pyridin-2-amine), the asymmetric unit contains one Zn(II) cation, two fa ligands and two 2-pa ligands, wherein the Zn(II) displays a distorted tetra-hedral geometry, being surrounded by two monodentate fa ligands with Zn-O distances of 1.962 (2) and 1.976 (3) Å, and by two 2-pa ligands with distances involving pyridyl N atoms of 2.069 (2) and 2.056 (2) Å. The F atoms of the fa ligands are equally disordered over two sites, viz. the 2- and 6-positions of fa. The mononuclear complex mol-ecules are joined by N-H⋯O and N-H⋯F hydrogen bonds into a two-dimensional layer, which is further constructed into a three-dimensional supra-molecular network by weak C-H⋯F inter-actions and effective π-π stacking [centroid-centroid separation of 3.74 (3) Å] between the inter-layer aromatic rings and adjacent heterocycles.

The asymmetric unit of the title compound, [Zn(C12H8N5)2(C2H8N2)]·CH3OH·2H2O, contains a ZnII cation, octahedrally coordinated by two 3-(2-pyrid­yl)-5-(4-pyrid­yl)-1,2,4-triazolate anions, a chelating ethane-1,2-diamine mol­ecule, a methanol solvent mol­ecule, and two crystal water mol­ecules. In the crystal packing, complex mol­ecules are linked by hydrogen bonds into a two-dimensional layer.

The title compound, C8H6N4O2, is a difunctional compound with a carboxylate and a tetrazole residue. In the crystal structure, molecules are linked into two-dimensional sheets by intermolecular N—H...O and O—H...N hydrogen bonds.

In title compound, [Cd(C(9)H(6)N(2)O(2)S)(C(12)H(8)N(2))](n), the Cd(II) atom is in a distorted tetra-gonal-pyramidal environment, coordinated by one chelating 1,10-phenanthroline ligand, one chelating 2-(1,3-benzimidazol-2-ylsulfan-yl)acetate (bia) ligand bound through one N atom and one O atom of the carboxyl group, and one N atom from a second bia ligand. Each bia ligand acts as bridge between Cd(II) ions, forming one-dimensional coordination polymers along [010], with a shortest Cd⋯Cd distance of 4.27 (2) Å.

The title compound, [Zn2Cl4(C12H14N4)2]·2C3H7NO, is located on a centre of inversion with one half of a complex mol­ecule and one dimethyl­formamide solvent mol­ecule in the asymmetric unit. The ZnII ion is tetra­hedrally coordinated by two organic ligands and two chloride ions. Each organic ligand acts as a bidentate ligand, connecting two ZnII ions, resulting in a dimeric [2:2] metallamacrocyclic structure. Adjacent mol­ecules are further linked by N—H⋯Cl hydrogen bonds and the solvent is linked to the complex by N—H⋯O hydrogen bonds.

The asymmetric unit of the title compound, [Zn(C2H8N2)3]Cl2·H2O, contains a discrete [Zn(C2H8N2)3]2+ cation with a distorted octahedral geometry around Zn, two uncoordinated chloride ions and one water molecule. The crystal structure exhibits N—H...O, N—H...Cl and O—H...O hydrogen bonds.

The asymmetric unit of the title complex, [Cu(2)(CN)(2)(C(20)H(16)N(6)S(2))](n), contains one Cu(I) cation, one cyanide ligand and half of a centrosymmetric 1,2-bis-[4-(3-pyrid-yl)pyrimidin-2-ylsulfan-yl]ethane (bppe) ligand. The Cu(I) atom displays a trigonal coordination geometry, being surrounded by one C atom from one cyanide anion and two N atoms from one cyanide and one bppe ligand. In the complex, each cyanide anion links two Cu(I) atoms in a bis-monodentate mode into a zigzag [-Cu-CN-](n) chain. Two parallel chains are linked by bppe ligands into a ladder chain.