Non-centrosymmetric Ce3OCl[AsO3]2

Hamdi Ben Yahia, Ute Ch Rodewald, Rainer Pöttgen

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11 Citations (Scopus)

Abstract

The arsenite chloride Ce3OCl[AsO3]2 was synthesized in the form of colorless crystals from arsenic and cerium dioxide in a NaCl/KCl flux at 850 °C. Ce3OCl[AsO3]2 crystallizes with the noncentrosymmetric tetragonal Gd3OCl[AsO 3]2 type, space group P42nm. The structure was refined from single crystal diffractometer data: a = 12.8590(6), c = 5.5627(3) A° , wR2 = 0.0429, 1463 F2 values, and 65 variables. The structure is built up from chains of trans edge-sharing OCe4/2 tetrahedra. The [AsO3]3- units coordinate to these chains via the oxygen atoms. Their lone-pairs point all to a common channel. Formation of the non-centrosymmetric superstructure is most likely driven by geometrical constraints and is discussed on the basis of a group-subgroup scheme.

Original languageEnglish
Pages (from-to)896-900
Number of pages5
JournalZeitschrift fur Naturforschung - Section B Journal of Chemical Sciences
Volume64
Issue number8
DOIs
Publication statusPublished - 2009

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Keywords

  • Crystal structure
  • Oxoarsenite
  • Rare earth compound

ASJC Scopus subject areas

  • Chemistry(all)

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