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In the title compound, C6H17N32+·2ClO4−, the piperazine ring adopts a chair conformation with the ethylammonium fragment occupying an equatorial position. In the crystal, the dications and perchlorate anions are linked through N—H...O hydrogen bonding and weak C—H...O hydrogen bonding into a three-dimensional supramolecular network.

In the title compound, [CdCl2(C14H21N3O2)], the Schiff base ligand chelates the CdII ion in an N,N,O-tridentate fashion. Two Cl atoms complete a distorted square-pyramidal coordination environment around the metal atom. In the crystal, adjacent molecules are linked through C—H...π interactions into infinite chains along the a axis. The molecules are further connected into a three-dimensional network via N—H...O, N—H...Cl and C—H...Cl interactions. The ethylene group is disordered over two sets of sites in a 0.520 (10):0.480 (10) ratio.

In the title compound, [CdCl2(C13H19N3O)], the CdII ion is pentacoordinated with the N,N,O-tridentate Schiff base 2-{[2-(piperazin-4-ium-1-yl)ethyl]iminomethyl}phenolate ligand and two Cl atoms in a highly distorted square-pyramidal geometry; the piperazine ring adopts a chair conformation. In the crystal structure, adjacent molecules are linked together via N—H...O and N—H...Cl hydrogen bonds, forming infinite layers parallel to the ab plane. The layers are further connected through C—H...Cl interactions into a three-dimensional network.

In the title compound, C20H24N4, the cyclohexane ring adopts a chair conformation with the two imine groups linked at equatorial positions. The two halves of the molecule are related by a crystallographic twofold rotation axis. The dihedral angle between the pyridine rings is 75.73 (3)°.

In the title compound, [CuCl2(C11H17N3)], the CuII ion is five-coordinated with a distorted square-pyramidal configuration. The three N atoms of the Schiff base ligand and one Cl atom are located in the basal plane, whereas the other Cl atom is apically positioned.