Hydrothermal Synthesis and Crystal Structure Determination of Heptasilver(I)-Disulfur-Tetrathioarsenate(V), Ag7S2(AsS4), with a Survey on Thioarsenate Anions
✍ Scribed by F. Pertlik
- Publisher
- Elsevier Science
- Year
- 1994
- Tongue
- English
- Weight
- 213 KB
- Volume
- 112
- Category
- Article
- ISSN
- 0022-4596
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✦ Synopsis
The compound (\mathrm{Ag}{7} \mathrm{~S}{2}\left(\mathrm{AsS}{4}\right)) has been synthesized by hydrothermal techniques and characterized by single-crystal X-ray diffraction data. Crystals suitable for structure determination were grown from a mixture of elementary silver, sulfur, and arsenic(III) sulfide in ammonia water. The compound is cubic, (P 2,3-T^{4}), with (a=) 10.475(1) (\AA). The structure was solved by Patterson and Fourier methods and refined to (R=0.044, R{w}=0.028). The three crystallographically independent (\mathrm{Ag}) atoms are surrounded by two, three, and four (\mathrm{S}) atoms ((\mathrm{Ag}-\mathrm{S}<3.3 \AA) ) and three or four (\mathrm{Ag}) atom neighbors (\left(\mathrm{Ag}-\mathrm{Ag}<3.3 \AA\right.) ). These (\mathrm{Ag}) polyhedra and the (\mathrm{AsS}_{4}) tetrahedra form a three-dimensional framework. O 1994 Academic Press, Inc.