Germanium sulfide

Schwcfel-gerbung, /. sulfur tannage, -germanium, n. germanium sulfide, -geruch, m. sul fur odor. 

First Synthesis of Mesostructured Hexagonal Germanium Sulfides Using Gemini Surfactants... 

The 2 2PTy2(t) Crystal Structure of Germanium Sulfide [GeS2]... 

Hal = F, Cl, Br, I), a solid state reaction between germanium sulfide and suitable lead dihalides at ca 570 K was used304-306. The observed IEs, corresponding to ionizations from the valence shell MOs, are presented in Table 11. 

Non-aqueous synthetic methods have recently been used to assemble mesoporous transition metal oxides and sulfides. This approach may afford greater control over the condensation-polymerization chemistry of precursor species and lead to enhanced surface area materials and well ordered structures [38, 39], For the first time, a rational synthesis of mesostructured metal germanium sulfides from the co-assembly of adamantanoid [Ge4S ()]4 cluster precursors was reported [38], Formamide was used as a solvent to co-assemble surfactant and adamantanoid clusters, while M2+/1+ transition metal ions were used to link the clusters (see Fig. 2.2). This produced exceptionally well-ordered mesostructured metal germanium sulfide materials, which could find application in detoxification of heavy metals, sensing of sulfurous vapors and the formation of semiconductor quantum anti-dot devices. 

In recent years, germanium sulfides have been prepared for glass films that are widely applied in many fields. 

Ozin etal. subsequently prepared hexagonal mesostruc-tured germanium sulfides by using low-valent metal cations suchas Co +, Ni +, Cu+, andZn + to connect [Ge4Sio]" clusters around cetyltrimethylammonium bromide (CTAB). This approach is similar to the synthesis of microstructured [(CH3)4N]4Mn[Ge4Sio]. However, Ozin s approach used for-mamide as the solvent instead of water. 

Similar to germanium sulfides or selenides, [SiqSeio] adamantine clusters also exist and have been found to form mesostractured semiconductors with Pt + when templated by the lyotropic liquid-crystalline phase of alkylpyridiniinn surfactant [Ci6H33NC5H5]Br. This mesophase designated as CiePyPtSnSe has a band gap of 1.5 eV. 

Germanium 2.0 937 2830 Germinate (mixture of copper, iron, and germanium sulfides) Reduction of Ge02 with H2 or C... 

The area of germanium sulfide cluster anions has been enriched by the publication of a number of new compounds. The structure of the quaternary germanium sulfide AgLasGeSg has been elucidated and shown to comprise La3GeS4 cubes linked through Ge—S bonds to form a three dimensional arrayIn contrast, the anion [CuGe2S5] comprises [Ge4Sio]" units. ... 

O.M. Yaghi, Z. Sun, and D. Richardson, Directed Transformation of Molecules to Solids Synthesis of a Microporous Sulfide from Molecular Germanium Sulfide Cages. J. Am. Chem. Soc., 1994, 116, 807-808. 

Extraction. — Germanium ores may be decomposed in a number of ways. (1) The mixed sulfides may be dissolved in strong sulfuric acid and evaporated to dryness. If the sulfates are taken up with water and treated with sodium sulfide, both zinc and germanium are precipitated. The former may be dissolved in sulfuric acid (15 100) while the germanium sulfide remains in solid form. (2) A more satisfactory separation is usually accomplished by suspending the oxides in 1 2 HC1 and saturating with H2S. Filter, wash with dilute HC1, and... 

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