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inorganic compounds
The title compound, lithium trimanganese bis[trioxoselenate(IV)] hexakis[hydrogentrioxoselenate(IV)], is built up from a vertex-sharing network of distorted MnIIIO6 octahedra, SeO3 and HSeO3 pyramids, and unusual Li(OH)6 octahedra, resulting in a dense three-dimensional structure. Mn, Li and one Se atom have site symmetries of 
, 
, and 3, respectively. An O—H
O hydrogen bond helps to establish the crystal packing.
, 
, and 3, respectively. An O—HO hydrogen bond helps to establish the crystal packing.inorganic compounds
The title compound contains chains of edge-sharing distorted VO6 octahedra. Pyramidal TeO3 groups and unusual capped trigonal-bipyramidal LiO6 polyhedra complete a three-dimensional structure.
organic compounds
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The title compound {systematic name: (+)-(S)-3-[5-cyano-2-(4-fluorophenyl)-1,3-dihydroisobenzofuran-2yl]propanaminium oxalate oxalic acid 0.325-hydrate}, 2C20H22FN2O+·C2O42−·C2H2O4·0.325H2O, is a molecular salt of the N-protonated escitalopram cation. As well as charge-balancing oxalate dianions, neutral molecules of oxalic acid are present. The component species interact by way of N—HO and short O—HO hydrogen bonds, resulting in supramolecular chains.
O and short O—HO hydrogen bonds, resulting in supramolecular chains.organic compounds
In the title compound [also called 5,6-dibromoisoindole-1,3(2H)-dione], C8H3Br2NO2, there are two planar molecules in the asymmetric unit. They both form inversion dimers, one via N—HO links and one via short near-linear C—HO links. The dimers are then linked into chains by further N—HO hydrogen bonds.
O links and one via short near-linear C—HO links. The dimers are then linked into chains by further N—HO hydrogen bonds.metal-organic compounds
The title compounds, (C8H20N)[H2AsO4][H3AsO4]2, (I), and (C6H14N2)[H2AsO4]2[H3AsO4], (II), are unusual salts containing organic cations, dihydrogenarsenate anions and neutral arsenic acid molecules. In (I), the dihydrogenarsenate anion lies across a twofold rotation axis in the space group C2/c, while the cation is disordered across a centre of inversion. The [H2AsO4]− and H3AsO4 species interact by way of O—HO hydrogen bonds, leading to sheets and a three-dimensional network for (I) and (II), respectively.
O hydrogen bonds, leading to sheets and a three-dimensional network for (I) and (II), respectively.metal-organic compounds
The title compound, Na+·3C2H6NO2+·2SiF62-·3C2H5NO2, arose from an unexpected reaction of glycine and HF with the glass container. It is an unusual hybrid organic-inorganic network built up from chains of vertex-sharing NaF4O2 and SiF6 octahedra. A pair of glycinium/glycine molecules bridges the chains into a sheet via a centrosymmetric OHO link. The other organic species interact with the network by an extensive N-HF hydrogen-bond network, including bifurcated and trifurcated bonds. Finally, an extremely short C-HO interaction (HO = 2.25 Å) is seen in the crystal structure. The Na atom has site symmetry 
.
HO link. The other organic species interact with the network by an extensive N-HF hydrogen-bond network, including bifurcated and trifurcated bonds. Finally, an extremely short C-HO interaction (HO = 2.25 Å) is seen in the crystal structure. The Na atom has site symmetry 
.
