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Single crystals of the already known phases Ag 3 AsO 4 , AgHg I  2 AsO 4 , AgHg II AsO 4 , Ag 2 SeO 4  and of the hitherto unknown compound Ag 2 Hg II (SeO 3 ) 2  were obtained under hydrothermal conditions (250 °C, 5d) from starting mixtures of the metal nitrates and the respective acids. Both Ag 3 AsO 4  and AgHg I  2 AsO 4  are isotypic with the corresponding phosphates, Ag 3 PO 4  and AgHg I  2 PO 4 , whereas AgHg II AsO 4  and Ag 2 SeO 4  crystallize in the thenardite (Na 2 SO 4  (V)) structure. All crystal structures were refined by means of single crystal X-ray data. The crystal structure of Ag2Hg II (SeO 3 ) 2  [Pbca, Z = 8, a = 6.8206(11), b = 11.237(3), c = 16.876(2) Å , 1677 structure factors, 101 parameters, R[F 2  &gt; 2σ (F 2 )] = 0.0193, wR(F 2  all) =0.0394] consists of considerably distorted [AgO 6 ] and [HgO 6 ] octahedra, and trigonal Se IV O 3  pyramids as the main building units. The [MO 6 ] octahedra build a complex framework by sharing common edges and corners, and the Se IV O 3  pyramids are located in the vacancies of this arrangement. The average Hg-O distance of 2.399 Å is significantly shorter than the average Ag-O distance of 2.551Å . The geometries of the two crysta̱llographically independent Se IV O 3  pyramids are very similar and the average distance and angle (d(Se-O) = 1.709 Å , ∠(O-S-O) = 100.1°) lie in the characteristic range for a selenite(IV) group. A short comparative structural discussion between the various compounds obtained during the hydrothermal experiments is given.

zeitschrift für naturforschung b

Investigations in the Systems Ag-Hg-X-O (X = As V , Se IV , Se VI ): Hydrothermal Single Crystal Growth of Ag 3 AsO 4 , AgHg I  2 AsO 4 , AgHg II AsO 4 , Ag 2 SeO 4  and the Crystal Structure of Ag 2 Hg II (SeO 3 ) 2