ZEITSCHRIFT FUR NATURFORSCHUNG SECTION B-A JOURNAL OF CHEMICAL SCIENCES
Issue Date:
2016
Abstract(summary):
The quaternary gold arsenide oxides Ce9Au5-xAs8O6 and Pr9Au5-xAs8O6 were synthesized from the rare earth elements (RE), rare earth oxides, arsenic and gold powder at maximum annealing temperatures of 1173 K. The structures were refined from single crystal X-ray diffractometer data: Pnnm, a =3D 1321.64(6) pm, b =3D 4073.0(3), c =3D 423.96(2), wR2 =3D 0.0842, 3106 F-2 values, 160 variables for Ce9Au4.91(4)As8O6 and Pnnm, a =3D 1315.01(4), b =3D 4052.87(8), c =3D 420.68(1) pm, wR2 =3D 0.0865, 5313 F-2 values, 160 variables for Pr9Au4.75(1)As8O6. They represent a new structure type and show a further extension of pnictide oxide crystal chemistry. A complex polyanionic gold arsenide network [Au5As8](15-) (with some disorder in the gold substructure) is charge compensated with polycationic strands of condensed edge-sharing O@RE4/4 and O@RE4/3 tetrahedra ([RE4O3](2)(12+)) as well as RE3+ cations in cavities.
Page:
1245---1252
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