(E)-N'-(4-Methoxy-benzyl-idene)benzohydrazide.

In the title mol-ecule, C(15)H(14)N(2)O(2), the dihedral angle between the benzene rings is 5.93 (17)°. In the crystal, inter-molecular N-H⋯O hydrogen bonds link the mol-ecules into chains propagating in [010].

(E)-N'-[1-(4-Bromo-phen-yl)ethyl-idene]benzohydrazide.

The asymmetric unit of the title compound, C(15)H(13)BrN(2)O, contains two independent mol-ecules with different conformations; the two aromatic rings form dihedral angles of 32.4 (4) and 27.5 (4)° in the two mol-ecules. In the crystal structure, inter-molecular N-H⋯O hydrogen bonds link mol-ecules into chains propagating in [100].

catena-Poly[[bis-[2-chloro-6-(1H-1,2,4-triazol-1-yl-κN)pyridine]cadmium(II)]-di-µ-thio-cyanato-κN:S;κS:N]: a one-dimensional coordination polymer.

In the crystal structure of the title complex, [Cd(NCS)(2)(C(7)H(5)ClN(4))(2)](n), the Cd(II) atom lies on a crystallographic inversion center and assumes a distorted octa-hedral geometry. The 2-chloro-6-(1H-1,2,4-triazol-1-yl)pyridine mol-ecule acts as a terminal ligand. The thio-cyanate ligands function as µ(1,3)-bridging units connecting adjacent Cd(II) atoms with a separation of 5.7525 (11) Å, forming a one-dimensional chain along the a axis.

Diaqua-bis[2-(2-pyridylmeth-oxy)pyrazine-κN]bis-(thio-cyanato-κN)cobalt(II).

In the title complex, [Co(NCS)(2)(C(10)H(9)N(3)O)(2)(H(2)O)(2)], the Co(II) ion is located on a crystallographic twofold rotation axis and is in a slightly distorted octa-hedral CoN(4)O(2) coordination environment. The dihedral angle between the pyridine and pyrazine rings is 85.86 (10)°. In the crystal structure, inter-molecular O-H⋯N and O-H⋯S hydrogen bonds link complex mol-ecules into a three-dimensional network.

Dichlorido(2,6-dipyrazol-1-ylpyridine)zinc(II).

In the title complex, [ZnCl(2)(C(11)H(9)N(5))], the Zn(II) ion assumes a distorted trigonal-bipyramidal ZnN(3)Cl(2) coordination geometry [Zn-N = 2.1397 (16)-2.2117 (17) Å, Zn-Cl = 2.2470 (6) and 2.2564 (6) Å]. The crystal packing exhibits π-π stacking inter-actions between the 2,6-dipyrazol-1-ylpyridine ligands of neighbouring mol-ecules.

catena-Poly[[[2,6-bis-(pyrazol-1-yl-κN)pyridine-κN](nitrato-κO,O')cadmium(II)]-µ-thio-cyanato-κN:S].

In the title crystal structure, [Cd(NCS)(NO(3))(C(11)H(9)N(5))](n), the unique Cd(II) ion is coordinated in a distorted penta-gonal-bipyramidal environment. The axial thio-cyanate ligands act in a µ(1,3)-bridging mode to connect symmetry-related Cd(II) ions into one-dimensional chains along [010]. In addition, there are inter-molecular C-H⋯O contacts between chains.