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In the title mononuclear complex, [HgI2(C12H11NO3)], the HgII ion has a distorted trigonal–planar coordination sphere defined by two I− anions and the N atom of a methyl 2-(quinolin-8-yloxy)acetate ligand. In the crystal, face-to-face π–π stacking interactions, with a centroid–centroid distance of 3.563 (9) Å, are observed.

In the title complex, [HgBr2(C12H11NO3)], the HgII ion has a distorted core trigonal–planar geometry comprising two Br atoms and one quinoline N atom of the methyl 2-(quinolin-8-yloxy)acetic acid ligand. The angles around the Hg atom vary from 100.31 (15) to 152.65 (4)°. Two additional Hg...O interactions [2.739 (1) and 2.905 (1) Å] complete the coordination sphere about the HgII atom.

In the centrosymmetric tetranuclear title compound, [Cu4I4(C10H8N2S2)2], there are two different CuI atoms with tetrahedral coordination geometries. One is chelated by a pyridine N atom and an S-donor from one di-2-pyridyl disulfide ligand and coordinated by two I atoms, while the second CuI atom is coordinated by a pyridine-N and three I atoms. Iodine bridges between the CuI atoms form a tetranuclear structure.

In the title compound, [Cu(C4H5O4)(H2O)]n, the iminodiacetate (ida) ligands link the CuII atoms into polymeric zigzag chains running along [010]. Each CuII ion is five-coordinated in a distorted square-pyramidal geometry by one N and two O atoms from an ida ligand, one O atom from the neighbouring ida ligand and one water O atom. In the crystal, the polymeric chains are held together via intermolecular O—H...O and N—H...O hydrogen bonds.

In the neutral title complex, [Ni(NCS)2(C14H18N2O2)]·H2O, the NiII ion has a distorted octahedral geometry with cis-isothiocyanate ligands.