Germanium chalcogenides

TABLE 2 Crystallographic data for ternary rare earth germanium chalcogenides... 

AMTIR Infrared glass made from germanium, arsenic and selenium - also known as chalcogenide glass. 

Keywords Chalcogenide Germanium compound Mesoporous semiconductor Self-assembly Zintl compound... 

Recently, we and others demonstrated that appropriate germanide Zintl clusters in non-aqueous liquid-crystalline phases of cationic surfactants can assemble well-ordered mesostructured and mesoporous germanium-based semiconductors. These include mesostructured cubic gyroidal and hexagonal mesoporous Ge as well as ordered mesoporous binary intermetallic alloys and Ge-rich chalcogenide semiconductors. 

Germanes hydride, 2 76 reactivity of, 2 87 Germanium anionic cluster, 24 227 azides, preparation, 9 138 properties, 9 135-136, 139, 141 binary carbide not reported, 11 211 carbides, preparation of, 11 163 chalcogenide halides, 23 390 chlorides, mass spectra of, 18 248, 249 complexes, xenon fluoride reactions, 46 85 compounds, see also Organogermanium compounds... 

NMR spectra, 20 347 structural parameters, 20 297, 299 structure of, 20 300 chalcogenide halides, 23 381-382 structure, 23 382 complexes, 6 2 anation reactions, 34 225 with bipy and phen, 12 185-187 5-coordinate, 34 229, 234, 236-238 with divalent tin, 11 119 with germanium, 11 107-108, 112 homoleptic, 2,2 -bipyridine, 34 28-30 with olefins, 12 311-316 sulfoxides, 24 166 carbonylation reactions, 24 143 and catalyzed decomposition of H2O2, 24 150-151... 

Associated structures are far less prevalent in compounds containing bonds to the heavier chalcogenides. Triorganotin and triorganolead thiolates, R3MSR (M = Sn, Pb), are monomeric and tetrahedral like their silicon and germanium counterparts.485-490 Weak intermolecu-... 

This section describes ternary chalcogenides of silicon, germanium, tin, lead, and indium systems. All of these elements, except indium, belong to Group 14 in the periodic table of elements and therefore, theoretically, all of them have stable +4 oxidation states. Thus, a substitution one element of Group 14 by another could result in a similar structure. However, structural relationships among the ternary compounds seem to not be as straightforward as this may appear. 

This section describes known quaternary chalcogenide systems containing silicon, germanium, tin, lead, and indium. 

The replacement of framework anions (i.e. with chalcogens (e.g. S ) represents a more recent approach for generating microporous materials. The efforts to make microporous chalcogenides began with germanium or tin sulfides. However, germanium or tin sulfides do not form microporous materials similar to all-silica polymorphs of zeolites. It was later found that the incorporation of low-valent cations such as Mn + into the Ge-S composition helped to generate 3D frameworks. 

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