Single crystals of the already known phases Ag3AsO4, AgHgI 2AsO4, AgHgIIAsO4, Ag2SeO4 and of the hitherto unknown compound Ag2HgII(SeO3)2 were obtained under hydrothermal conditions (250 °C, 5d) from starting mixtures of the metal nitrates and the respective acids. Both Ag3AsO4 and AgHgI 2AsO4 are isotypic with the corresponding phosphates, Ag3PO4 and AgHgI 2PO4, whereas AgHgIIAsO4 and Ag2SeO4 crystallize in the thenardite (Na2SO4 (V)) structure. All crystal structures were refined by means of single crystal X-ray data. The crystal structure of Ag2HgII(SeO3)2 [Pbca, Z = 8, a = 6.8206(11), b = 11.237(3), c = 16.876(2) Å , 1677 structure factors, 101 parameters, R[F2 > 2σ (F2)] = 0.0193, wR(F2 all) =0.0394] consists of considerably distorted [AgO6] and [HgO6] octahedra, and trigonal SeIVO3 pyramids as the main building units. The [MO6] octahedra build a complex framework by sharing common edges and corners, and the SeIVO3 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 SeIVO3 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.
在250°C、5天的水热条件下,从金属硝酸盐和相应酸的起始混合物中得到了已知相Ag3AsO4、AgHgI2AsO4、AgHgIIAsO4、Ag2SeO4以及迄今为止未知的化合物Ag2HgII(SeO3)2的单晶。Ag3AsO4和AgHgI2AsO4与相应的磷酸盐Ag3PO4和AgHgI2PO4同晶,而AgHgIIAsO4和Ag2SeO4结晶于thenardite(Na2SO4(V))结构中。所有晶体结构都通过单晶X射线数据进行了精确修正。Ag2HgII(SeO3)2的晶体结构[Pbca,Z = 8,a = 6.8206(11),b = 11.237(3),c = 16.876(2) Å,1677个结构因子,101个参数,R[F2 > 2σ(F2)] = 0.0193,wR(F2 all) = 0.0394]由明显扭曲的[AgO6]和[HgO6]八面体以及三角形的SeIVO3金字塔作为主要构建单元组成。[MO6]八面体通过共享公共边和角构建复杂的框架,SeIVO3金字塔位于这种排列的空位中。平均Hg-O距离为2.399 Å,明显短于平均Ag-O距离2.551 Å。两个晶体学上独立的SeIVO3金字塔的几何形状非常相似,平均距离和角度(d(Se-O) = 1.709 Å,∠(O-S-O) = 100.1°)处于硒酸盐(IV)群的特征范围内。对水热实验中得到的各种化合物进行了简短的结构比较讨论。