The structure of Ba5Cl4(H2O)8(PVO5)8 consists of alternating anionic oxovanadium phosphate (VPO5) and cationic barium chloride hydrate, Ba5Cl4(H2O)8, layers. These layers are linked through Ba—O bonds, generating a three-dimensional framework.

The novel hydro­thermally synthesized title compound, penta­barium tetra­chloride octa­hydrate octa­kis(oxovanadium phosphate), Ba5Cl4(H2O)8(VPO5)8, crystallizes in the ortho­­rhom­bic space group Cmca with a unit cell containing four formula units. Two Ba2+ cations, two Cl− anions and the O atoms of four water mol­ecules are situated on the (100) mirror plane, while the third independent Ba2+ cation is on the inter­section of the (100) plane and the twofold axis parallel to a. Two phosphate P atoms are on twofold axes, while the remaining independent P atom and both V atoms are in general positions. The structure is characterized by two kinds of layers, namely anionic oxovanadium phosphate (VPO5), composed of corner-sharing VO5 square pyramids and PO4 tetra­hedra, and cationic barium chloride hydrate clusters, Ba5Cl4(H2O)8, composed of three Ba2+ cations linked by bridging chloride anions. The layers are connected by Ba—O bonds to generate a three-dimensional structure.

In the title compound, C13H14N4O·C3H7NO, a 1,5-phenyl­carbonohydrazide mol­ecule cocrystallizes with an N,N-dimethyl­formamide mol­ecule. In the 1,5-phenyl­carbonohydrazide mol­ecule, the two phenyl rings are twisted by an angle of 45.8 (5)°. Inter­molecular N—H⋯O hydrogen bonds and weak inter­molecular C—H⋯O inter­actions contribute to a supra­molecular two-dimensional network in the (101) plane.

In the title compound, C16H10O8·H2O, the dihedral angle between the two benzene rings is 71.63 (5)°. In the crystal structure, pairs of inversion-related mol­ecules are stacked [mean inter­planar spacing = 3.5195 (18) Å], and O—H⋯O and C—H⋯O hydrogen bonds create a three-dimensional network.

In the title complex, [CuCl2(C18H16N2O2)2]·CH3CN·H2O, the six-coordinated Cu atom is in a distorted octa­hedral geometry with the donor centers of two O atoms and two N atom from two bidentate ligands, and two chloride ions. In the crystal, pairs of inter­molecular N—H⋯ Cl hydrogen bonds form centrosymmetric dimers and inter­molecular O—H⋯ O hydrogen bonds between the ligand and the uncoordinated water mol­ecules link the dimers into chains parallel to the c axis.

In the title complex, [Zn(NO3)2(C17H14N2O2)(H2O)], the six-coordinated Zn atom is in a distorted octa­hedral geometry, the donor centers being two O atoms and one N atom from the tridentate organic ligand, a water O atom and two O atoms from two monodentate nitrate ions. In the crystal, O—H⋯O hydrogen bonds between the coordinated water mol­ecules and nitrate O atoms and N—H⋯O hydrogen bonds between the main ligand and nitrate O atoms consolidate the three-dimensional network.