Cover illustration: The ordered structure of the Et3NH+ cation of triethylammonium chloride, showing 50% probability displacement ellipsoids. The N-HCl hydrogen bond is indicated by a dashed line. See Churakov & Howard [Acta Cryst. (2004), C60, o557-o558].
In Ce3Fe1.94S7, which adopts the Ce6Al3.33S14 structure type, isolated FeS4 tetrahedra, all pointing in the same direction, are stacked along the threefold rotation axes. Chains of face-sharing FeS6 octahedra are connected by CeS7+1 bicapped trigonal prisms.
A new non-symmetrical form of LiMoO2(AsO4) has been synthesized by a solid-state reaction method. It crystallizes in monoclinic space group P21. The three-dimensional open framework is built up of corner-sharing AsO4 tetrahedra and MoO6 octahedra containing tunnels running along the a axis, where Li+ cations are located.