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1.  The solid solution (Fe0.81Al0.19)(H2PO4)3 with a strong hydrogen bond 
A sample of synthetic (Fe0.81Al0.19)(H2PO4)3 was prepared by hydro­thermal methods in order to determine the crystal structure. The compound is a new monoclinic variety (γ-form) and the structure is based on a two-dimensional framework of distorted corner-sharing MO6 (M = Fe, Al) polyhedra sharing corners with PO4 tetra­hedra.
Single crystals of the solid solution iron aluminium tris(dihydrogenphosphate), (Fe0.81Al0.19)(H2PO4)3, have been pre­pared under hydro­thermal conditions. The compound is a new monoclinic variety (γ-form) of iron aluminium phosphate (Fe,Al)(H2PO4)3. The structure is based on a two-dimensional framework of distorted corner-sharing MO6 (M = Fe, Al) polyhedra sharing corners with PO4 tetra­hedra. Strong hydrogen bonds between the OH groups of the H2PO4 tetra­hedra and the O atoms help to consolidate the crystal structure.
PMCID: PMC2855575  PMID: 20203392
2.  Ethyl 6-amino-5-cyano-4-isopropyl-2-methyl-4H-pyran-3-carboxyl­ate 
In the title compound, C13H18N2O3, the two H atoms of the NH2 group are engaged in hydrogen bonding with the N atom of the cyano group and with one O atom of the ethoxy­carbonyl group, building a chain parallel to the [100] direction. The N—H⋯N hydrogen bonds assemble the mol­ecules around inversion centres, forming dimers with an R 2 2(12) graph-set motif.
PMCID: PMC2967956  PMID: 21581681
3.  Redetermination of K4[Bi2Cl10]·4H2O 
In comparison with the previous refinement of tetra­potassium di-μ-chlorido-bis­[tetra­chloridobismuthate(III)] tetra­hydrate [Volkova, Udovenko, Levin & Shevchenko (1983). Koord. Khim. 9, 356–360], the current redetermination reveals anisotropic displacement parameters for all non-H atoms, localization of the H atoms, and higher precision of lattice parameters and inter­atomic distances. The crystal structure is built up of edge-sharing [Bi2Cl10]4− double octa­hedra with the bridging Cl atoms situated on a mirror plane, three K+ counter-cations (two of which are on mirror planes), and two water mol­ecules that are solely coordinated to the K+ cations. These building units are linked into a three-dimensional network structure. Additional O—H⋯Cl hydrogen bonds between the water mol­ecules and the complex anions stabilize this arrangement.
PMCID: PMC2960101  PMID: 21581105
4.  N-(Hydroxymethyl)ibogaine 
The title compound (systematic name: 16-hydroxy­methyl-12-methoxy­ibogamine), C21H28N2O2, was prepared by reaction of ibogaine with a formaldehyde–acetic acid solution (pH = 4). The crystal structure of this new product, belonging to the iboga indole family, is stabilized by an inter­molecular O—H⋯N hydrogen bond. The identity of the compound was confirmed by one- and two-dimensional NMR spectroscopic techniques.
PMCID: PMC2960727  PMID: 21201722
5.  N-Methyl­isosalsoline from Hammada scoparia  
The title compound (systematic name: 1,2-dimethyl-6-meth­oxy-1,2,3,4-tetra­hydro­isoquinolin-7-ol), C12H17NO2, is a major alkaloid isolated from Hammada scoparia leaves. It belongs to the isoquinoline family and it was characterized by NMR spectroscopy and X-ray crystallographic techniques. The absolute configuration could not be reliably determined. An intermolecular O—H⋯N hydrogen bond is present in the crystal structure.
PMCID: PMC2960642  PMID: 21201700

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