Poly[[(μ₄-1,3,5-triamino-1,3,5-tride­oxy-cis-inositol)sodium] bromide]

In the structure of the title compound, {[Na(C₆H₁₅N₃O₃)]Br}_n, the sodium cation and the bromide anion are both located on threefold rotation axes. The sodium cation is bonded to the three hy­droxy groups of one 1,3,5-triamino-1,3,5-tride­oxy-cis-inositol (taci) ligand, with the taci ligand residing around the same threefold rotation axis as the sodium ion. The coordination sphere of the sodium ion is completed by three amino groups of three neighbouring taci mol­ecules. Hence, this type of coordination constitutes a three-dimensional open framework with channels along the c axis which are filled with the bromide counter-anions. Each bromide ion forms three symmetry-related hydrogen bonds to both the hy­droxy and the amino groups of neighbouring taci ligands.

Bis(3-aza­niumylpyridin-1-ium) hexa­chloridostannate(IV) dichloride

The asymmetric unit of the title compound, (C₅H₈N₂)₂[SnCl₆]Cl₂, consists of one 3-aza­niumylpyridin-1-ium dication and one chloride ion in a general position and a hexa­chloridostannate(IV) dianion lying about a centre of inversion. The [SnCl₆]²⁻ anion exhibits almost perfect octa­hedral geometry. The 3-aza­niumylpyridin-1-ium and chloride ions are connected via medium–strong charge-supported N—H...Cl hydrogen bonds, forming undulating layers in the (110) plane. The [SnCl₆]²⁻ ions are located between these layers and occupy cavities formed by two facing layer puckers.

trans-Dichlorido­tetra­kis­[(di­methyl­phosphor­yl)methanaminium-κO]cobalt(II) tetra­chloridocobaltate(II)

The asymmetric unit of the title structure, [CoCl₂(C₃H₁₁NOP)₄][CoCl₄]₂, consists of one half of the trans-dichlorido­tetra­kis­[(di­methyl­phosphor­yl)methanaminium]cobalt(II) tetra­cation lying on an inversion center and one tetra­chloridocobaltate(II) dianion on a general position. Four O-coordinated cationic (di­methyl­phosphor­yl)methanaminium (dpmaH⁺) ligands occupy the equatorial coordination sites, whereas the chloride ligands occupy axial positions of the roughly o­cta­hedral coordination polyhedron of the cobalt metal center. Intra­molecular hydrogen bonds between the aminium groups and the O atom of the phosphoryl groups and additional hydrogen bonds between the aminium groups and the chloride ligands are present. Furthermore, four of the six H atoms not involved in intra­molecular bonding of each cobalt(II) tetra­cation form weak hydrogen bonds to four adjacent tetra­chloridocobaltate(II) counter-anions. By these inter­molecular hydrogen bonds, one-dimensional polymeric strands are formed along the b-axis direction. The hydrogen bonding is analyzed using the graph-set method and the structural similarity with dpmaHCl is discussed.

Pseudosymmetric fac-di­aqua­trichlorido[(di­methyl­phosphor­yl)methanaminium-κO]manganese(II)

In the title compound, [Mn(C₃H₁₁NOP)Cl₃(H₂O)₂], the Mn^II metal center has a distorted o­cta­hedral geometry, coordinated by the three chloride ligands showing a facial arrangement. Two water mol­ecules and the O-coordinated dpmaH cation [dpmaH = (di­methyl­phosphor­yl)methanaminium] complete the coordination sphere. Each complex mol­ecule is connected to its neighbours by O—H...Cl and N—H...Cl hydrogen bonds. Two of the chloride ligands and the two water ligands form a hydrogen-bonded polymeric sheet in the ab plane. Furthermore, these planes are connected to adjacent planes by hydrogen bonds from the aminium function of cationic dpmaH ligand. A pseudo-mirror plane perpendicular to the b axis in the chiral space group P2₁ is observed together with inversion twinning [ratio = 0.864 (5):0.136 (5)].

Bis[(di­methyl­phosphor­yl)methan­amin­ium] tetra­chlorido­palladate(II)

In the crystal structure of the title compound, (C₃H₁₁NOP)₂[PdCl₄], (di­methyl­phosphor­yl)methanaminium (dpmaH⁺) cations are connected head-to-tail by strong N—H...O hydrogen bonds, forming inversion-related cyclic dimers. The square-planar [PdCl₄]²⁻ counter-dianion is located about a center of inversion. The dications and the [PdCl₄]²⁻ dianions are connected by medium–strong N—H...Cl hydrogen bonds, forming zigzag chains parallel to [001]. Somewhat weaker N—H...Cl hydrogen bonds connect the chains into a three-dimensional network.

2-Amino­pyridin-1-ium triiodide

The asymmetric unit of the title compound, C₅H₇N₂^+.I₃⁻, consists of one 2-amino­pyridin-1-ium cation (apyH⁺) and one triiodide anion, both located in general postions. The apyH⁺ cation is planar within the experimental uncertainties. The short N—C distance [1.328 (5) Å] of the exocyclic NH₂ group is typical for the imino-form of protonated 2-amino­pyridines. Consequently, the bond lengths within the six-membered ring vary significantly. The geometric parameters of the triiodide anion are in the typical range, with bond lengths of 2.8966 (3) and 2.9389 (3) Å and a bond angle of 176.02 (1)°. In the crystal, N—H ... I hydrogen bonds connect adjacent ions into screwed chains along the b-axis direction. These chains are twisted pairwise into rectangular rods. The pyridinium moieties of neighbouring rods are arranged parallel to each other with a plane-to-plane distance of 3.423 (5) Å.

(Di­methyl­phosphor­yl)methanaminium iodide–(di­methyl­phosphor­yl)methan­amine (1/1)

The asymmetric unit of the title structure, C₃H₁₁NOP⁺·I⁻·C₃H₁₀NOP, consists of one (di­methyl­phosphor­yl)methanamine (dpma) mol­ecule, one (di­methyl­phosphor­yl)methanaminium (dpmaH) ion and one iodide counter-anion. In the crystal, medium–strong to weak N—H...O and N—H...N hydrogen bonds connect dpmaH cations and dpma mol­ecules into strands along [001]. The iodide counter-anions form only very weak hydrogen bonds. The crystal used for the diffraction study was found to be an inversion twin with a ratio of 0.83 (2):0.17 (2). The title structure is isotypic to that of dpmaH[ClO₄]·dpma [Buhl et al. (2013). Crystals 3, 350–362].

(Di­methyl­phosphor­yl)methanaminium nitrate

In the crystal of the title salt, C₃H₁₁NOP⁺·NO₃⁻, dicationic inversion dimers are head-to-tail connected by a pair of strong N—H...O hydrogen bonds. The resulting graph-set descriptor of this ring system is R₂²(10). The nitrate counter-anions connect the dicationic dimers via N—H...O hydrogen bonds, forming two-dimensional networks in the bc plane.