Crystal Structure of La3OBr[AsO3]2
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چکیده
Colorless needles of the arsenite bromide La3OBr[AsO3]2 were synthesized from ammonium dihydrogen arsenate, ammonium bromide and lanthanum oxide in an NaBr/KBr flux at 900 ◦C. La3OBr[AsO3]2 crystallizes with the centrosymmetric tetragonal La3OCl[AsO3]2 type, space group P42/mnm. The structure was refined from single-crystal diffractometer data: a = 13.0431(15), c = 5.6127(7) Å, wR2 = 0.0454, 945 F2 values, and 39 variables. It consists of chains of trans-edge-sharing OLa4/2 tetrahedra which are coordinated by [AsO3]3− units via the oxygen atoms.
منابع مشابه
Non-centrosymmetric Ce3OCl[AsO3]2
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[AsO3]2 type, space group P42nm. The structure was refined from single crystal diffractometer data: a = 12.8590(6), c = 5.5627(3) Å, wR2 = 0.0429, 1463 F2 values, and 65 varia...
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