Cover illustration: Constructor graph of (3,5-dimethyl-1H-pyrazol-4-ylmethyl)isopropylammonium chloride monohydrate, viewed along the a axis. Arrows denote five types of hydrogen bonds, originate at the donor molecules and point to acceptor molecules. Squares represent cations, triangles Cl- anions and circles water molecules. Solid symbols are translated mirror images of the open symbols. See Guzei, Keter, Spencer & Darkwa [Acta Cryst. (2007), C63, o481-o483].
The structure of the title compound consists of layers of [Ru2Cl10O]4− and [Ba(H2O)7]2+ ions alternating along the c axis. The overall structure is held together by O—H⋯O hydrogen bonds and O—H⋯Cl dipole–dipole interactions.
KSrNb2O6F consists of double perovskite slabs, [SrNb2O6F]−, and interlayer K+ ions. Within the perovskite slabs, the NbO5F octahedra are tilted about the a axis and the O2− and F− ions exhibit an ordered distribution.
A new phase with the composition ZnTe6O13 was identified with trigonal (R) symmetry. The structure consists of an infinite three-dimensional network of Zn atoms coordinated in a distorted octahedral fashion by TeO4 and TeO3+1 polyhedra.