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首页> 外文期刊>Zeitschrift fur Anorganische und Allgemeine Chemie >Single crystal growth and crystal structure of mercurous diarsenate(V), (Hg-2)(2)(AS(2)O(7))
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Single crystal growth and crystal structure of mercurous diarsenate(V), (Hg-2)(2)(AS(2)O(7))

机译:亚砷酸汞(Vg,(Hg-2)(2)(AS(2)O(7))的单晶生长和晶体结构

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摘要

Polycrystalline mercurous diarsenate(V), (Hg-2)(2)(As2O7), was prepared by a redox-reaction between stoichiometric amounts of HgO and As2O3. Canary yellow single crystals were obtained by subsequent chemical transport reactions using HgCl2 as transport agent [550 --> 500 degreesC, 5d, sealed and evacuated silica ampoules]. The crystal structure (orthorhombic, Pnma, Z = 4, a = 9.9803(8), b = 12.2039(10), c = 7.2374(6) Angstrom) is composed of two crystallographically independent Hg-2(2+) dumbbells ((d) over bar (Hg-Hg) = 2.5133 Angstrom) with a symmetric oxygen coordination sphere, and a diarsenate group with a staggered conformation and a bent bridging angle As-O-As = 121.0(7)degrees. The building units are arranged in a layer-like assembly parallel to (010) and are connected via common oxygen atoms to form a three-dimensional network.
机译:通过化学计量量的HgO和As2O3之间的氧化还原反应制备了多晶体亚砷酸汞(V)(Hg-2)(2)(As2O7)。通过使用HgCl2作为转运剂[550-> 500℃,5d,密封并抽空的硅胶安瓿]进行后续的化学转运反应获得金丝雀黄单晶。晶体结构(斜方晶系,Pnma,Z = 4,a = 9.9803(8),b = 12.2039(10),c = 7.2374(6)埃)由两个晶体学独立的Hg-2(2+)哑铃组成(( d)具有对称氧配位球的棒(Hg-Hg)= 2.5133埃,以及具有交错构型和弯曲桥接角As-O-As = 121.0(7)度的二砷酸盐基团。这些建筑单元平行于(010)排列成层状,并通过共同的氧原子连接以形成三维网络。

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