Mohammad T. M. Al-Dajani

Diaqua­bis­(hydrogen tartrato)copper(II) dihydrate

The title complex, [Cu(C4H5O6)2(H2O)2]·2H2O, contains a CuII ion lying on an inversion centre. The coordination geometry of the CuII ion is a distorted octahedron with four O atoms from two hydrogen tartrate ions occupying the equatorial positions and two O atoms from two coordinated water molecules occupying the axial positions. In the crystal structure, intermolecular O—H⋯O and C—H⋯O hydrogen bonds link the molecules into a three-dimensional network.

Tetra­kis(2,6-diamino­pyridinium) diphthalate 2,6-diamino­pyridine

In the title compound, 4C5H8N3 +·2C8H4O4 2−·C5H7N3, the asymmetric unit consists of two protonated diaminopyridine cations, one phthalate anion and one half of a diaminopyridine molecule, which has twofold rotation symmetry and is disordered over two positions with a site-occupancy ratio of 0.534 (3):0.466 (3). In the disordered structure, both pyridine rings are essentially planar, with maximum deviations of 0.011 (2) and 0.006 (2) Å, and these two rings are inclined to one another at a dihedral angle of 79.86 (10)°. In the crystal structure, intermolecular N—H⋯O and C—H⋯O hydrogen bonds link the ions and molecules into a three-dimensional network. The structure is further stabilized by C—H⋯π interactions.

Bis(4-amino-pyridinium) bis(hydrogen oxalate) monohydrate.

In the title compound, 2C5H7N2 +·2C2HO4 −·H2O, the asymmetric unit consists of an aminopyridinium cation, an oxalic actetate anion and a half-molecule of water, which lies on a two-fold rotation axis. The crystal packing is consolidated by intermolecular O—H⋯O, N—H⋯O and C—H⋯O hydrogen bonds. The molecules are linked into an infinite one dimensional chain along [010].

2,6-Diamino­pyridinium 2-carb­oxy­benzoate

In the crystal of the title molecular salt, C5H8N3 +·C8H5O4 −, the diaminopyridine cation and the phthalate anion are linked by a pair of N—H⋯O hydrogen bonds. Within the phthalate anion, an almost symmetrical O—H⋯O hydrogen bond is observed. The ion pairs are linked by further N—H⋯O hydrogen bonds, generating a two-dimensional network lying parallel to (10).

Monoclinic polymorph of poly[aqua(μ4-hydrogen tartrato)sodium]

A monoclinic polymorph of the title compound, [Na(C4H5O6)(H2O)]n, is reported and complements an orthorhombic form [Kubozono, Hirano, Nagasawa, Maeda & Kashino (1993 ▶). Bull. Chem. Soc. Jpn, 66, 2166–2173]. The asymmetric unit contains a hydrogen tartrate anion, an Na+ cation and a water molecule. The Na+ ion is surrounded by seven O atoms derived from one independent and three symmetry-related hydrogen tartrate anions, and a water molecule, forming a distorted pentagonal–bipyramidal geometry. Independent units are linked via a pair of intermolecular bifurcated O—H⋯O acceptor bonds, generating an R 2 1(6) ring motif to form polymeric two-dimensional arrays parallel to the (100) plane. In the crystal packing, the arrays are linked by adjacent ring motifs, together with additional intermolecular O—H⋯O interactions, into a three-dimensional network.

Tetra­guanidinium bis­[citrato(3−)]cuprate(II) dihydrate

The asymmetric unit of the title compound, (CH6N3)4[Cu(C6H5O7)2]·2H2O, contains one-half of a centrosymmetric CuII complex anion, two guanidinium cations and a water molecule. The CuII ion, lying on a crystallographic inversion center, is hexacoordinated with two citrate anions in a distorted octahedral geometry. An intramolecular O—H⋯O hydrogen bond generates an S(6) ring motif. In the crystal structure, molecules are linked into a three-dimensional framework by intermolecular N—H⋯O and O—H⋯O hydrogen bonds.

Bis(2,6-diamino-pyridinium) tartrate monohydrate.

In the title compound, 2C5H8N3 +·C4H4O6 2−·H2O, the two cations are essentially planar [maximum deviations = 0.023 (1) and 0.026 (1) Å]. In one of the cations, the protonated N atom and one of the amino group H atoms are hydrogen bonded to one of the carboxyl groups of the dianion through a pair of N—H⋯O hydrogen bonds, forming an R 2 2(8) ring motif. In the crystal structure, the tartrate anions and water molecules are linked into chains along the c axis by intermolecular O—H⋯O and C—H⋯O hydrogen bonds. The cations further link the anions and water molecules into a three-dimensional extended structure by a network of N—H⋯O hydrogen bonds. The crystal structure is also stabilized by weak intermolecular π–π interactions [centroid–centroid distance = 3.6950 (6) Å].

N,N′-(Ethane-1,2-di­yl)bis­(4-chloro­benzene­sulfonamide)

The title molecule, C14H14Cl2N2O4S2, lies on an inversion center. The molecule is twisted in the region of the sulfonamide group with a C—S—N—C torsion angle of −67.49 (16)°. In the crystal, molecules are connected via intermolecular N—H⋯O and weak C—H⋯O hydrogen bonds, forming layers parallel to (100).

1,3-Benzothia­zole–oxalic acid (2/1)

The asymmetric unit of the title compound, C7H5NS·0.5C2H2O4, contains one benzothiazole molecule and half an oxalic acid molecule, the complete molecule being generated by inversion symmetry. The benzothiazole molecule is essentially planar, with a maximum deviation of 0.007 (1) Å. In the crystal, the benzothiazole molecules interact with the oxalic acid molecules via O—H⋯N and C—H⋯O hydrogen bonds generating R 2 2(8) (× 2) and R 4 4(10) motifs, thereby forming supramolecular ribbons along [101].

N,N′-(Ethane-1,2-di­yl)dibenzene­sulfonamide

In the title compound, C14H16N2O4S2, the dihedral angle between the terminal phenyl rings is 77.07 (13)°. The geometries around the S atoms are distorted tetrahedral, with O—S—O angles of 120.66 (12) and 119.44 (11)°. In the crystal, molecules are stacked in columns along the a axis via intermolecular N—H⋯O and C—H⋯O hydrogen bonds.