Cover illustration: A packing diagram for catena-poly[tris(ethylenediamine-2N,N')nickel(II) [[trithiocyanato-3N-sodium(I)]--aqua-2O:O]], projected along the c direction. Some of the hydrogen bonds are shown as dashed lines. See Shen & Jing [Acta Cryst. (2002), C58, m591-m592].
Cs[AgZn(NCS)4] crystallizes in two polymorphic forms, in space groups P21/n and C2/c. Both structures form a continuous three-dimensional network, the structure in C2/c containing a delocalized Ag atom.
HgSeO3·HgO·H2O is built up of strongly distorted [HgO6] and [HgO7] polyhedra and pyramidal [SeIVO3]2− anions, forming a channel structure. Additional water molecules are located at the centres of the channels.