Bis(tetra-phenyl-phospho-nium) tetra-chlorido-cobaltate(II).

The title compound, (C24H20P)2[CoCl4], was prepared under hydro-thermal conditions. In the crystal, the tetra-phenyl-phospho-nium cations are linked by pairs of weak C-H⋯π inter-actions into supra-molecular dimers; the Co(II) cations lie on twofold rotation axes and the tetra-hedral [CoCl4](2-) anions are linked with the tetra-phenyl-phospho-nium cations via weak C-H⋯Cl hydrogen bonds.

Di-aqua-bis-[2-(2-hy-droxy-eth-yl)pyridine-κ(2) N,O]cobalt(II) dichloride.

In the title salt, [Co(C7H9NO)2(H2O)2]Cl2, the Co(II) cation, located on an inversion center, is N,O-chelated by two hy-droxy-ethyl-pyridine ligands and coordinated by two water mol-ecules in a distorted O4N2 octa-hedral geometry. In the crystal, the Cl(-) anions link with the complex cations via O-H⋯Cl hydrogen bonds, forming a three-dimensional supra-molecular architecture. π-π stacking is observed between the pyridine rings of adjacent mol-ecules [centroid-centroid distance = 3.

4-(Di-methyl-amino)-pyridinium trichlorido[4-(di-methyl-amino)-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-(di-methyl-amino)-pyridine (DMAP) ligand and three Cl atoms, forming a CoNCl3 polyhedron with a distorted tetra-hedral 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-(di-methyl-amino)-pyridinium cations.

catena-Poly[[bis-[4-(dimethyl-amino)-pyridine-κN (1)]cobalt(II)]-di-μ-azido-κ(4) N (1):N (3)].

The title layered polymer, [Co(N3)2(C7H10N2)2] n , contains Co(II), azide and 4-(dimethyl-amino)-pyridine (4-DMAP) species with site symmetries m2m, 2 and m, respectively. The Co(2+) ion adopts an octa-hedral coordination geometry in which four N atoms from azide ligands lie in the equatorial plane and two 4-DMAP N atoms occupy the axial positions. The Co(II) atoms are connected by two bridging azide ligands, resulting in a chain parallel to the c axis.

Bis(azido-κN)bis-[4-(dimethyl-amino)-pyridine-κN]zinc.

In the title complex, [Zn(N3)2(C7H10N2)2], the Zn(II) atom is coordinated by two N atoms from two 4-(dimethyl-amino)-pyridine (DMAP) ligands and by two N atoms from two azide anions in a distorted tetra-hedral coordination geometry. In the crystal, weak C-H⋯N hydrogen bonds between the DMAP and azide ligands link these discrete complex mol-ecules into a three-dimensional supra-molecular network.

Bis(adeninium) bis-(hydrogensulfate) sulfate.

The title compound, 2C5H7N5(2+)·2HSO4(-)·SO4(2-), was synthesized from adenine and sulfuric acid. The asymmetric unit contains two diprotonated adeninium cations, two bis-ulfate anions and one sulfate anion. The crystal structure is stabilized by classical N-H⋯O and O-H⋯O hydrogen bonds, and weak C-H⋯O and C-H⋯N hydrogen bonds, generating a three-dimensional network.

dl-Tyrosinium chloride dihydrate.

In the title compound, C(9)H(12)NO(3) (+)·Cl(-)·2H(2)O, the cation has a protonated amino group resulting from proton transfer from chloridric acid. The structure displays double layers parallel to the [010] direction held together by N-H⋯O, N-H⋯Cl, O-H⋯O and O-H⋯Cl hydrogen bonds. These layers are stacked along the c axis at b = 1/2; within each layer, the tyrosinium cations are arranged in an alternating head-to-tail sequence, forming inversion dimers [R(2) (2)(10) motif].

dl-Asparaginium perchlorate.

Two enantiomeric counterparts (l- and d-asparginium cations related by glide planes) are present in the structure of the title compound, C(4)H(9)N(2)O(3) (+)·ClO(4) (-), with a 1:1 cation-anion ratio. The structure is built up from asparginium cations and perchlorate anions. In the crystal, mol-ecules assemble in double layers parallel to (100) through N-H⋯O, O-H⋯O and C-H⋯O hydrogen bonds.