Synthesis and crystal structure of rubidium oxovanadium(V) diphosphateстатья
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Дата последнего поиска статьи во внешних источниках: 18 июля 2013 г.
Аннотация:Rubidium oxovanadium(V) double diphosphate, (RbVOP2O7)-O-V, was synthesized and characterized for the first time by the methods of X-ray diffraction analysis. The compound was crystallized from a phosphoric acid-, Rb2CO3-, V2O5-, and ZnO- or CuO-containing melt at 290 degreesC. The unit-cell parameters are a = 4.6820(3), b = 9.003(1), c = 16.333(2) Angstrom, beta = 94.17(1)degrees; sp. gr. P2(1)/c, Z = 2. The crystal structure consists of corrugated layers of diphosphate groups and sharing-vertices vanadium(V) octahedra. One of the oxygen atoms of the oxo group belonging to the VO6-octahedron forms no contact with the phosphorus atom and participates only the coordination of the rubidium atom. The V-O distance with the participation of the oxo atom is somewhat shortened whereas that with the participation of oxygen in the trans position, somewhat elongated. Rubidium atoms are located between the layers. (C) 2000 MAIK "Nauka/Interperiodica".