Structural characterization of quaternary selenites of tungsten(VI), A2W3SeO12 (A = NH4, Cs, Rb, K or Tl)

• Main Authors: Vineela Balisetty, Kanamaluru Vidyasagar
• Format: Article
• Language: English
• Published: International Union of Crystallography 2021-04-01
• Series: Acta Crystallographica Section E: Crystallographic Communications
• Subjects: single-crystal x-ray structure; quaternary selenite; tungsten
• Online Access: http://scripts.iucr.org/cgi-bin/paper?S2056989021002735

The quaternary A2W3SeO12 (A = NH4, Cs, Rb, K or Tl) selenites have been prepared in the form of single crystals by hydrothermal and novel solid-state reactions. They were characterized by X-ray diffraction, thermal and spectroscopic studies. All of them have a hexagonal tungsten oxide (HTO) related [W3SeO12]2− anionic framework with pyramidally coordinated Se4+ ions. The known A2W3SeO12 (A = NH4, Cs or Rb) compounds are isostructural with the Cs2W3TeO12 compound and have a non-centrosymmetric layered structure containing intra-layer Se—O bonds. The new compound K2W3SeO12(α) is isostructural with the K2W3TeO12 compound and has a centrosymmetric three-dimensional structure containing interlayer Se—O bonds. It is inferred that the new Tl2W3SeO12 compound has the same three-dimensional structure as K2W3SeO12(α).