Cover illustration: View of the supramolecular structure exhibited by 2,4-dihydroxy-1,3-bis(methoxycarbonylmethoxy)calixarene. See Coles, Hall & Hursthouse [Acta Cryst. (2002), C58, o29-o31].
The structure of Cs2[AgZn(SCN)5] contains units of composition AgZn(SCN)3 lying on a mirror plane and bonded together through Cs+ ions and thiocyanate groups. The crystal studied contained equal numbers of inversion twins.
Single crystals of Ca3Mn2O7 were prepared in an optical floating-zone furnace. The symmetry, which was previously reported as tetragonal according to powder X-ray diffraction studies, is shown to be orthorhombic, A21am.
The complex oxide MoVAlO7, vanadium aluminium molybdate, crystallizes in the orthorhombic system (space group Pnma). All the metal atoms and three O atoms lie on the mirror plane. Infinite strings of VO5 square pyramids associated by opposite basal edges develop along  and are surrounded by a sequence of eight corner-sharing alternating AlO6 octahedra and MoO4 tetrahedra.
The crystal structure of the ambient-pressure phase of vanadyl pyrophosphate, (VO)2P2O7, determined from single-crystal synchrotron data, consists of infinite two-leg ladders of vanadyl cations, (VO)2+, which are separated by pyrophosphate anions, (P2O7)4−.
A new variety of dihydroxysamarium chloride is presented. The orthorhombic structure is built up from the stacking of neutral layers stabilized via strong hydrogen bonds between the hydroxyl H atoms and the chlorides.
AgCo3PO4(HPO4)2 consists of edge-sharing CoO6 chains linked together by the phosphate groups and hydrogen bonds. The three-dimensional framework delimits two types of tunnels which accommodate Ag+ cations and OH groups.
AlPO4 tridymite forms an intermediate phase between 373 and 573 K with space-group symmetry P1121. The crystal structure is dynamically disordered and develops an incommensurate displacive modulation below 473 K.
CaCs2[Ag2(SCN)6]·2H2O forms a continuous structure where the Ag atoms form chains with S atoms in the c-axis direction. The chains are bonded together through Cs and Ca atoms. The crystal water of the structure is bonded to the Ca atoms, which lie on centers of symmetry.