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inorganic compounds
Dimercury(II) germanium(IV) tetraselenide, Hg2GeSe4, adopts a cation-deficient diamond-like structure. It crystallizes in space group I
of the tetragonal system. The structure consists of tetrahedral [HgSe4] and [GeSe4] groups. These groups are interconnected by sharing common corners. The previous structure report on Hg2GeSe4 based on powder diffraction data [Parasyuk et al., (2003). J. Alloys Compd, 351, 135-144] is comparable with our results except for the absolute configuration determination. In the asymmetric unit, the site symmetries of the Hg and Ge atoms are .
of the tetragonal system. The structure consists of tetrahedral [HgSe4] and [GeSe4] groups. These groups are interconnected by sharing common corners. The previous structure report on Hg2GeSe4 based on powder diffraction data [Parasyuk et al., (2003). J. Alloys Compd, 351, 135-144] is comparable with our results except for the absolute configuration determination. In the asymmetric unit, the site symmetries of the Hg and Ge atoms are .inorganic compounds
The structure of trisodium phosphide, Na3P, known from X-ray powder diffraction data, has been refined based on single-crystal data. The compound crystallizes in the hexagonal A3B (A = alkali metal and B = group 15 element) structure type and is isotypic with the homologous potassium phase. The framework is built of Na+ and P3- ions arranged in two kinds of layers perpendicular to the c axis. Two of the Na atoms and the P atom reside at positions of 
m2 (2b), 3m (4f) and m2 (2c) site symmetry, respectively.
m2 (2b), 3m (4f) and m2 (2c) site symmetry, respectively.inorganic compounds
The structure of manganese distannite, MnSn2, known from X-ray powder diffraction data, has been refined based on single-crystal data. This intermetallic compound crystallizes in the tetragonal CuAl2 structure type. Mn atoms (4a position) form chains parallel to the c axis and each Mn atom is surrounded by eight Sn atoms in a square antiprism. Each Sn atom (8h position) has four Mn near neighbors from two neighboring Mn chains forming Mn4Sn rectangular prisms.
metal-organic compounds
The title compound, [Cd(C10H8N2)(C3H4N2)2]n, is a new neutral centrosymmetric three-dimensional metal–organic framework structure. The metal atoms occupy inversion centres and the bipyridine ligands also possess Ci symmetry. The metal atoms are bridged by four imidazole ligands and two bipyridine units.
