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The crystal structure of di-μ3-chlorido-tetra-μ2-chlorido-dichloridoocta(imidazole-κN)tetramanganese(II) ethanol 1.234 solvate, [Mn4Cl8(C3H4N2)8]·1.234C2H5O or [Mn4Cl8(Him)8]·1.234EtOH, where Him is imidazole (C3H4N2), is based upon two Mn4Cl4 cubes which share one face, and which each lack one manganese vertex, giving a Mn4Cl6 unit. This contains two different octahedral coordination environments for the Mn atoms. Mn1 is coordinated by four bridging chlorido ligands and two imidazole N atoms, whereas Mn2 is coordinated by three bridging and one terminal Cl and two imidazole N atoms. The remaining two Mn centres are generated by inversion symmetry. A partial occupancy solvent molecule (ethanol) is present. The crystal structure displays several N—H...Cl and N—H...O hydrogen bonds.

The title compound, (C6H8N4)[Mn(H2O)6](SO4)2, was obtained by cocrystallization of 2,2′-biimidazolium sulfate and bis(tetrabutylammonium) tetrachloridomanganate(II). The asymmetric unit contains one isolated (SO4)2− anion, one half of an octahedral [Mn(H2O)6]2+ dication and one half of a 2,2′-biimidazolium dication, each of which lies on an inversion centre. Molecules are connected by a three-dimensional N—H...O and O—H...O hydrogen-bond network.

The structure of the centrosymmetric title compound, [Cu2Cl6(C10H15N4)2]·2H2O, consists of a dimeric [{(HMe4bpz)CuCl3}2] unit (HMe4bpz is 3,3′,5,5′-tetramethyl-4,4′-bipyrazol-1-ium) with two solvent water molecules. Each [HMe4bpz]+ cation is bonded to a CuCl3 unit through a Cu—N dative bond, effectively making square-planar geometry at the Cu atom. Two of these units then undergo a face-to-face dimerization so that the Cu atoms have a Jahn–Teller distorted square-pyramidal geometry with three chlorides and an N atom in the basal plane and one chloride weakly bound in the apical position. Several N—H...Cl, O—H...Cl and N—H...O hydrogen bonds form a three-dimensional network.

The asymmetric unit of the title compound, (C4H5N2O)2[Cu2Cl6(C4H4N2O)2]·2H2O, consists of one cation, one half of a centrosymmetric dianion and one water molecule. The centrosymmetric dianion formed by dimerization in the crystal structure has neutral pyrimidin-2-one ligands coordinated to each copper(II) centre through Cu—N bonds. The Cu atoms each have a distorted trigonal bipyramidal geometry, with the N atom of the pyrimidin-2-one ligand in an axial position, and dimerize by sharing two equatorial Cl atoms. N—H...Cl, O—H...Cl and N—H...O hydrogen bonds connect the anions, cations and water molecules, forming a three-dimensional network.

The title compound, (C4H5N2O)5[Cd3Cl11], was obtained from the reaction of 2-hydroxypyrimidine hydrochloride and cadmium(II) chloride in concentrated HCl solution. The crystal structure consists of planar 2-oxo-1,2-dihydropyrimidin-3-ium cations with both N atoms protonated and the O atom unprotonated, and a complex trinuclear [Cd3Cl11]5− anion of approximately D3h symmetry, which has a triangle of three octahedrally coordinated CdII centres bonded to 11 chloride ions. Three of the chloride ions bridge adjacent Cd atoms, two cap the faces of the Cd3 triangle and the remaining six are terminally bonded and act as hydrogen-bond acceptors. Various N—H...Cl hydrogen bonds connect the anions and cations and, in addition, intermolecular N—H...O hydrogen bonds contribute to the formation of a three-dimensional network.

In the title compound, [CuCl2(C4H4N2O)(H2O)], the CuII cation is coordinated by two chloride anions, one pyrimidin-2-one N atom and one water molecule, giving a slightly distorted square-planar geometry. In the crystal structure, the pyrimidin-2-one rings stack along the b axis, with an interplanar distance of 3.306 Å, as do the copper coordination planes (interplanar spacing = 2.998 Å). The coordination around the Jahn–Teller-distorted CuII ion is completed by long Cu...O [3.014 (5) Å] and Cu...Cl [3.0194 (15) Å] interactions with adjacent molecules involved in this stacking. Several N—H...Cl, O—H...Cl and O—H...O intermolecular hydrogen bonds form a polar three-dimensional network.