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In the title compound, C(11)H(9)N(3)O, the quinazoline unit is almost planar, with a mean deviation of 0.006 (1) Å from the least-squares plane defined by the ten constituent atoms. In the crystal, mol-ecules are linked by weak C-H⋯N hydrogen bonds.

The asymmetric unit of the title compound, [Zn(C(8)H(12)N(2)O(4))(H(2)O)(2)](n), contains a Zn(II) ion residing on an inversion center, half of a centrosymmetric piperazine-1,4-diacetate ligand (L) and a water mol-ecule. The Zn(II) ion is trans-coordinated by two N,O-bidentate L ligands and by two water mol-ecules in a distorted octa-hedral geometry. In the crystal structure, inter-molecular O-H⋯O hydrogen bonds link polymeric chains into a three-dimensional supra-molecular structure.

The mol-ecular skeleton of the title mol-ecule, C(9)H(11)NOS, is essentially planar: the thio-phene ring is inclined to the mean plane of the rest non-H atoms by 2.92 (3)°. The crystal packing exhibits no significantly short inter-molecular contacts.

In the title compound, [Ni(SCN)(C(16)H(32)N(4))]ClO(4)·H(2)O, the Ni(II) ion is coordinated by the four N atoms of the tetra-azacyclo-tetra-deca-4,11-diene macrocyclic ligand and by the S atom of a thio-cyanate anion. The perchlorate anion is rotationally disordered around one Cl-O bond between two orientations; the occupancies refined to 0.61 (4) and 0.39 (4). Inter-molecular O-H⋯N, N-H⋯O and N-H⋯N hydrogen bonds link two cations, two anions and two solvent water mol-ecules into a centrosymmetric cluster. The crystal packing is further stabilized by weak inter-molecular C-H⋯O hydrogen bonds.

In the title compound, [Co(C(10)H(12)N(2)O)(2)(H(2)O)(2)](NO(3))(2)·2H(2)O, the Co(II) ion, located on an inversion center, is trans-coordinated by two N,O-bidentate chelating (E)-3-(dimethyl-amino)-1-(2-pyrid-yl)prop-2-en-1-one ligands and by two water mol-ecules in a slightly distorted octa-hedral geometry. Inter-molecular O-H⋯O hydrogen bonds link the cations, anions and water mol-ecules into layers parallel to the ac plane. The crystal packing also exhibits weak inter-molecular C-H⋯O hydrogen bonds.

The title compound, C(14)H(16)N(8)O(2) (2+)·2ClO(4) (-), was prepared by reaction of bis-[amino-(2-pyrid-yl)methyl-ene]oxalohydrazide with perchloric acid. The mol-ecular symmetry is C(i) and thus the asymmetric unit comprises one half-mol-ecule. The dihedral angle between the aromatic ring and the plane of the oxamide group is 70.8 (3)°. The perchlorate anions and the cations are connected by inter-molecular N-H⋯O hydrogen bonds.