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In the title compound, [Hg(C17H15N2S2)2], the HgII ion lies on a crystallographic twofold rotation axis giving a very distorted tetrahedral coordination geometry best described as bisphenoidal, being chelated by two deprotonated N,S Schiff base ligands through the azomethine nitrogen and the thiolate sulfur donors. The dihedral angle between the two chelating ligand moieties is 79.75 (10)°. In the crystal, weak C—H...S interactions give rise to chains extending along the c axis.

In the title complex, [Cd(C17H15N2S2)2], the CdII ion is located on a twofold rotation axis and exhibits a coordination number of four within a very distorted coordination environment that is best described as bisphenoidal. The two deprotonated Schiff base ligands chelate the CdII ion through the azomethine N and the thiolate S atom. The dihedral angle between the two chelating ligands is 84.01 (9)°. Weak intermolecular C—H...S interactions lead to the formation of chains along the c axis.

In the title compound, C11H12N2S2, the dithiocarbazate group adopts an EE configuration with respect to the C=C and C=N bonds of the propenylidene group. The atoms of the propenylidene and dithiocarbazate unit are essentially co-planar, with a maximum deviation of 0.058 (1) Å; the phenyl ring forms a dihedral angle of 18.3 (1)° with this fragment. In the crystal, molecules form inversion dimers via pairs of N—H...S hydrogen bonds involving the terminal S atom.

The coordination around the Sb atom in the title compound, (C6H16N)[Sb(C14H10O3)2], is fourfold in a pseudo-trigonal-bipyramidal pattern in which one of the equatorial sites is occupied by the stereoactive lone pair of electrons. The four ligating atoms comprise the hydoxylate and carboxylate O atoms from two independent benzilate ligands, each of which forms a five-membered chelating ring, spanning an axial and an equatorial site about the Sb atom. The hydroxylate atoms occupy the two equatorial sites, and the carboxylate atoms are in the pseudo-axial sites; the O—Sb—O angle is 147.72 (5)°. One carboxylate group shows quite different bond lengths from those of the other group; one O atom is clearly the carbonyl atom and the other O atom the hydroxylate atom. In the other ligand, there is less distinction in the C—O bonds. This is presumably related to the carbonyl O atom being the acceptor atom of a strong N—H...O hydrogen bond, which links the ammonium cation to the Sb complex anion.

In the title compound, C16H25N3OS, the thiosemicarbazone group adopts an E configuration with respect to the C=N bond and is almost coplanar with the benzene ring, forming a dihedral angle of 9.3 (1)°. In the crystal packing, the molecules lie along the a axis in an antiparallel arrangement and are held in place by van der Waals interactions. As a consequence, there is relatively low anisotropic thermal motion in the terminal atoms of the n-octyl chain.

The title molecule, C18H20N2O4, is located on a crystallographic centre of symmetry. The methoxy groups are coplanar with the benzene ring [interplanar angles of 14.4 (2) and 3.1 (3)°], indicating a conjugation effect.

In the title ZnII complex, [Zn(C17H15N2S2)2], the ZnII atom lies on a twofold rotation axis. It exists in a tetrahedral geometry, chelated by two deprotonated Schiff base ligands. The dihedral angle between each ligand is 71.48 (8)°. Molecules are connected by weak C—H...S intermolecular interactions into chains along the c axis. The crystal structure is further stabilized by C—H...π interactions involving the phenyl ring of the 3-phenylprop-2-enylidene unit.

The CuII atom of the title complex, [Cu(C17H15N2S2)2], lies on a twofold rotation axis, and is in a distorted tetrahedral geometry with the two bidentate N2S2 Schiff bases. In the crystal structure, the molecules are interconnected into chains along the c axis by weak C—H...S intermolecular interactions. The crystal packing is further stabilized by C—H...π interactions.