β-Sr(VOAsO4)2: A Strontium Vanadyl(IV) Arsenate with a Tunnel Structure
1996; Elsevier BV; Volume: 122; Issue: 1 Linguagem: Inglês
10.1006/jssc.1996.0078
ISSN1095-726X
AutoresSue‐Lein Wang, Wen-Jiuan Tsai,
Tópico(s)Polyoxometalates: Synthesis and Applications
ResumoA new polymorph of strontium vanadium(IV) arsenate, β-Sr(VOAsO4)2, has been synthesized hydrothermally at 450°C in a quartz glass tube and characterized by single-crystal X-ray diffraction and magnetic susceptibility measurements. It crystallizes in the orthorhombic space groupP212121. Crystal data:a= 4.9269(5) Å,b= 12.565(1) Å,c= 12.739(1) Å,V= 788.7(1) Å3,Z= 4. The intensity data were collected using a CCD area detector system and MoKα radiation. FinalR= 0.0381 andRw= 0.0423 for 1315 unique reflections withI> 3σ(I). The three-dimensional framework [V2As2O10]?in is characterized by the assemblage of infinite chains ofcis-corner-sharing VO6octahedra running along thea-axis which are linked by monoarsenate groups along [010] and [001]. One-dimensional tunnels are formed along the chain direction where strontium cations are located. Magnetic susceptibility data confirm the presence of V4+in the compound. The structure is discussed and compared with the other polymorph, α-Sr(VOAsO4)2.
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