Poly[[penta­aqua­bis­(μ₃-hydrogen squarato)barium] monohydrate]

The crystal structure of the title compound, {[Ba(C₄HO₄)₂(H₂O)₅]·H₂O}_n, consists of discrete double chains propagating along [010]. The chains are formed by Ba^II ions linked by bridging hydrogen squarate ligands in a trans-bis-monodentate mode. In addition, the bridging hydrogen squarate ligands connect the chains into a ladder structure via a third coordinating O atom. The remaining coordination sites are occupied by five aqua ligands and a second mondendate hydrogen squarate ligand, forming a slightly distorted tricapped trigonal–prismatic geometry. O—H...O hydrogen bonds link the chains and solvent water mol­ecules into a three-dimensional network.

4-(Di­methyl­amino)­pyridinium trichlorido[4-(di­methyl­amino)­pyridine-κN]cobaltate(II)

In the anion of the title compound, (C₇H₁₁N₂)[CoCl₃(C₇H₁₀N₂)], the Co^II ion is coordinated by one N atom from a 4-(di­methyl­amino)­pyridine (DMAP) ligand and three Cl atoms, forming a CoNCl₃ polyhedron with a distorted tetra­hedral geometry. In the crystal, cations and anions are linked via weak N—H...Cl and C—H...Cl hydrogen bonds. Double layers of complex anions stack along the b- axis direction, which alternate with double layers of 4-(di­methyl­amino)-pyridinium cations.

catena-Poly[bis­(μ₃-2-phenyl­acetato-κ³O,O′:O)bis­(μ₂-2-phenyl­acetato-κ²O:O′)dicopper(II)(Cu—Cu)]

The title polymeric compound, [Cu₂(C₈H₇O₂)₄]_n, was synthesized by the reaction of copper acetate with aqueous phenyl­acetic acid. The unique Cu^II atom is coordinated by five O atoms from the carboxyl­ate groups of phenyl­acetate ligands, and the strongly distorted octa­hedral coordination environment is completed by a Cu—Cu bond of 2.581 (2) Å, at whose mid-point is located an inversion centre. The crystal structure consists of infinite polymeric linear chains of Cu²⁺ ions, running along [100], linked by bridging phenyl­acetate groups.

Bis{1-[(E)-(2-chloro­phen­yl)diazen­yl]naphthalen-2-olato}copper(II)

The Cu^II atom in the title compound, [Cu(C₁₆H₁₀ClN₂O)₂], is located on an inversion center and is tetra­coordinated by two N and two O atoms from two bidentate 1-[(E)-(2-chloro­phen­yl)diazen­yl]naphthalen-2-olate ligands, forming a square-planar complex. In the crystal, mol­ecules are linked via weak C—H...O and C—H...Cl hydrogen bonds, forming chains propagating along [010]. There are also π–π inter­actions present involving adjacent naphthalene rings [centroid–centroid distance = 3.661 (13) Å].

2,2′-(Disulfanedi­yl)dianilinium dichloride dihydrate

In the title hydrated mol­ecular salt, C₁₂H₁₄N₂S₂²⁺·2Cl⁻·2H₂O, the dihedral angle between the benzene rings in the dication is 9.03 (17)° and the C—S—S—C torsion angle is 96.8 (2)°. The crystal packing can be described as alternating organic and anionic water layers lying parallel to (100), which are linked by N—H...Cl and N—H...O hydrogen bonds. O—H...Cl hydrogen bonds and aromatic π–π stacking inter­actions [centroid–centroid separation = 3.730 (3) Å] are also observed.