September 1998 issue
cif-access (inorganic compounds)
Better data have enabled eight Na+ cations per [Ce(W5O18)2]8− anion to be identified, in contrast to the six found earlier [Iball et al. (1974). J. Chem. Soc. Dalton Trans. pp. 2021-2024]. The two W5O186− ligands, related by a crystallographic twofold axis through the square antiprismatic CeO8 group, are therefore unprotonated.
cif-access (metal-organic compounds)
The structure is isomorphous with that of the bis(thioselenato) analog, with the Ni atom lying on a center of symmetry.
The title compound consists of discrete neutral complexes with crystallographic C2 symmetry. The Fe-O bond distances are 2.0556 (12) and 2.0937 (13) Å, and the Fe-N bond distance is 2.2290 (16) Å.
α-(NH4)V(HPO4)2 is a new ammonium vanadium(III) phosphate, built up from a three-dimensional framework of VO6 octahedra and HPO4 tetrahedra.
Triammonium dizinc vanadium bis(phosphate) bis(hydrogen phosphate) is built up from a three-dimensional network of VO6 octahedra and ZnO4, PO4 and HPO4 tetrahedra. NH4+ cations occupy two different interstices in the framework.
The three-dimensional network structure of this compound comprises VO5 pyramids and (As,V)2O7 groups sharing corners to form puckered layers. The layers are linked to each other by chains of VO6 octahedra. Cs2V3(As0,635V0,365)4O17 is isostructural with Cs2V3P4O17.
Li3V6O13 is found to be the composition of the phase formed (at 2.45 V versus Li/Li+) on electrochemical lithiation of V6O13; this phase retains the C2/m space group of V6O13.
ZnNiP4O12 is composed of cyclic [P4O12] groups forming sheets parallel to the crystallographic (100) plane. These sheets are separated by zigzag chains of alternating NiO6 or ZnO6 octahedra that share a common edge, the cations being statistically disordered.
ErRh2B2C is the end member of the rhodium-based quaternary borocarbides. The structure of ErRh2B2C can be viewed as a layered structure of tetrahedrally coordinated Rh2B2 layers and ErC NaCl-type layers.
The tetracalcium dialuminium hydroxide carbonate pentahydrate Ca4Al2(OH)12CO3.5H2O is a layered compound encountered in the chemistry of cement paste. It is composed of positively charged [Ca4Al2(OH)12]2+ main layers and negatively charged [CO3.5H2O]2− interlayers. The Al3+ and Ca2+ ions are six- and sevenfold coordinated, respectively, by O atoms. The planar CO32− groups are directly connected to the main layers and tilted by 21.8 (9)° from the planes formed by these layers.