inorganic compounds
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The title compound, Li3AsS4·8H2O, is built up from infinite cationic [Li3(H2O)8]3+ chains which extend along [001] and are cross-linked by isolated tetrahedral AsS43− anions via O—HS hydrogen bonds. Two Li and two As atoms lie on special positions with site symmetries -1 (1 × Li) and 2 (1 × Li and 2 × As). The [Li3(H2O)8]3+ chain contains four independent Li atoms of which two are in octahedral and two in tetrahedral coordination by water O atoms. An outstanding feature of this chain is a linear group of three edge-sharing LiO6 octahedra to both ends of which two LiO4 tetrahedra are attached by face-sharing. Such groups of composition Li5O16 are linked into branched chains by means of a further LiO4 tetrahedron sharing vertices with four adjacent LiO6 octahedra. The Li—O bonds range from 1.876 (5) to 2.054 (6) Å for the LiO4 tetrahedra and from 2.026 (5) to 2.319 (5) Å for the LiO6 octahedra. The two independent AsS43− anions have As—S bond lengths ranging from 2.1482 (6) to 2.1677 (6) Å [<As—S> = 2.161 (10) Å]. The eight independent water molecules of the structure donate 16 relatively straight O—HS hydrogen bonds to all S atoms of the AsS4 tetrahedra [<OS> = 3.295 (92) Å]. Seven water molecules are in distorted tetrahedral coordination by two Li and two S; one water molecule has a flat pyramidal coordination by one Li and two S. At variance with related compounds like Schlippe's salt, Na3SbS4·9H2O, there are neither alkali–sulfur bonds nor O—HO hydrogen bonds in the structure.
metal-organic compounds
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In the mononuclear title iridium(III) complex, [Ir(C4H8)(C15H22BN6)(C3H9P)], which is based on the [tris(3,5-dimethylpyrazol-1-yl)hydroborato]iridium moiety, Ir[TpMe2], the IrIII atom is coordinated by a chelating butane-1,4-diyl fragment and a trimethylphosphane ligand in a modestly distorted octahedral coordination environment formed by three facial N, two C and one P atom. The iridium–butane-1,4-diyl ring has an envelope conformation. This ring is disordered because alternately the second or the third C atom of the butane-1,4-diyl fragment function as an envelope flap atom (the occupancy ratio is 1:1). In the crystal, molecules are organized into densely packed columns extending along [101]. Coherence between the molecules is essentially based on van der Waals interactions.