Cover illustration: Packing diagrams for the two forms of 2,2,3,3,4,4-hexafluoropentane-1,5-diol, both at 173 K, viewed with respect to the (012) plane and with the  axis parallel to the horizontal axis. The hydrogen-bonding network (dashed lines) is preserved through the phase transition. See Ha & Young [Acta Cryst. (2009), C65, o388-o395].
The title cobalt vanadophosphate dihydrate contains flat layers of VO5 and PO4 polyhedra covalently linked by CoII ions coordinated to vanadyl O atoms. This is believed to be the first example of a layered vanadophosphate bridged by a transition metal ion in this manner.
Sr2[Cu(OH)6] crystallizes in the monoclinic system in the space group P21/n (No. 14). The crystal structure is built up from mutually isolated highly elongated Cu(OH)6 octahedra and trigonal Sr(OH)6 prisms, forming layers parallel to (110). The Cu(OH)6 octahedra are connected into an infinite three-dimensional framework of hydrogen bonds.
The title compound, Na10(Na,Mn)7Mn43(PO4)36, has been synthesized hydrothermally. Its crystal structure is similar to that of natural fillowite-type phosphates and can be described as a hexagonal packing of three types of rods parallel to the c axis, which show an alternation of Mn, Na and P sites and lattice vacancies.
The title compound, tetraamminedibromidochromium(III) diamminetetrabromidochromium(III), crystallizes in the space group P (Z = 1). The structure is composed of octahedral trans-[CrBr2(NH3)4]+ cations and octahedral trans-[CrBr4(NH3)2]− anions adopting a distorted CsCl-type lattice.