M2VOP2O7 (M = Rb, Cs): Two vanadyl pyrophosphates with a layer structure

K. H. Lii, S. L. Wang

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The new compounds Rb2VOP2O7 and Cs2VOP2O7 were prepared by heating stoichiometric mixtures of Rb3VO4 (or Cs3VO4), VO2, V, and P2O5 in sealed quartz tubes. For Rb2VOP2O7, orthorhombic, P212121, a = 7.101(1), b = 9.174(2), c = 12.801(4) Å, V = 834.0(4)° Å3, Z = 4, and R = 5.56%, Rw = 5.88% for 928 independent reflections. For Cs2VOP2O7, orthorhombic, Pnma, a = 13.280(3), b = 7.247(2), c = 9.518(2) Å, V = 916.0(4) Å3, Z = 4, and R = 4.12%, Rw = 4.53% for 1118 independent reflections. Both structures consist of corrugated layers of vanadyl pyrophosphate with the alkali metal cations between the layers. Each layer is built up from corner-sharing VO5 square pyramids and P2O7 groups. These two compounds adopt a markedly different structure from K2VOP2O7.

Original languageEnglish
Pages (from-to)239-246
Number of pages8
JournalJournal of Solid State Chemistry
Issue number2
StatePublished - Oct 1989


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