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The title compound, [Cu(C(13)H(8)N(5)O)Cl](n), has a chain structure parallel to [100] with Cu(2+) cations in a trigonal-bipyramidal coordination environment. The ligand adopts a tridentate tripyridyl coordination mode and a chloride ion acts as a bridge. The chains are linked via weak C-H⋯O and C-H⋯Cl hydrogen bonds into a three-dimensional supra-molecular network.

In the title compound, [CdCl(2)(C(13)H(10)N(6))], the 2-amino-4,6-bis(pyridin-2-yl)-1,3,5-triazine (HABPT) ligand adopts a tridentate tripyridyl coordination mode. The Cd(II) atom is five-coordinated by three N atoms from the HABPT ligand and two chloride ions. In the crystal, mol-ecules are linked via N-H⋯N, N-H⋯Cl and C-H⋯Cl hydrogen bonds into a supra-molecular network.

The title compound, C(10)H(11)N(3)O(4), is a condensation product of 4-nitro-phenyl-hydrazine and methyl pyruvate. The complete mol-ecule except for the methyl groups can be considered as a conjugated π system. All non-H atoms are approximately coplanar (r.m.s. deviation 0.117 Å). The crystal packing involves an N-H⋯O hydrogen bond and a π-π inter-action between the aromatic rings, with a centroid-centroid distance of 3.617 Å.