Monotellurides

The monosulfides of the alkaline earth metals crystallize in the rock salt (MgS, CaS, SrS, BaS) and zinc blende (BeS) structures. BaS is insoluble in water, while the other monosulfides are sparingly soluble but hydrolyzed on warming (except MgS that is completely hydrolyzed). The monoselenides are isomorphous to the sulfides. The monotellurides CaTe, SrTe, BaTe adopt the rock salt stmcture, while BeTe has the zinc blende and MgTe the wurtzite structure. Alkaline earth polysulfides may be prepared by boiling a solution or suspension of the metal hydroxide with sulfur, e.g.,... 

Carbon monotelluride is only known as a ligand coordinated to osmium1,2 or molybdenum3. Air-stable carbonyldichloro(telluracarbonyl)bis triphenylphosphane]osmium(II) was obtained from carbonyldichloro(dichlorocarbene)bis[triphenylphosphane]osmi-um(III) and sodium hydrogen telluride in benzene1,2. 

Nickel Sesquitelluride, Ni2Te3, occurs in nature as the mineral melonite. It may be prepared by the addition of sodium telluride solution to one of nickel acetate acidulated with acetic acid.7 The resulting black precipitate has the composition Ni2Te3.4H20, and when heated in hydrogen yields Nickel Monotelluride, NiTe. 

Platinum Subtelluride, Pt2Te.—On heating the monotelluride in the blowpipe for a short time a product2 is obtained corresponding to the formula Pt2Te. 

Platinum Monotelluride, PtTe.—On fusing the ditelluride in the blowpipe flame and then allowing it to cool, platinum monotelluride crystallises out in polyhedra.1... 

Table 5 Thiolperoxidase-like behavior of monotellurides 60, dendrimer wedges 61-63, and dendrimers 64 toward the oxidation of thiophenol with hydrogen peroxide in methanol...

Potassium tellurides.—The monotelluride, K2Te, was originally produced by Davy12 by direct combination of the elements. At 250° C. the reaction is even more energetic than that between sodium and tellurium. When prepared in an atmosphere of hydrogen, the product has a crystalline structure, and a dark iridescent-purple colour. With water it yields a purple solution, being reprecipitated by alcohol in the form of small, ill-defined crystals.18... 

The monotelluride and the tritelluride, K2Te8, have been prepared by the interaction of tellurium and a solution of potassium in liquid ammonia.14... 

The monosulfides of the rare earth elements behave differently from that discussed here since these are metal-like for all but those elements forming the most stable divalent states. Here a general proclivity towards forming tripositive ions seems more important (as in the metals themselves)—a property usually considered to result from a fortuitous balance between ionization and lattice or solvation energies. The sulfides have also been interpreted in terms of a degeneracy of the upper 4f levels with a 5d band (where applicable) (10). In contrast to the halides, there is little differentiation of the electrical properties among the monosulfides, monoselenides, and monotellurides (29). 

AICI3[g] ALUMINIUM CHLORIDE (GAS) 31 AITe[g] ALUMINIUM MONOTELLURIDE (GAS) 70... 

AsTe[g] ARSENIC MONOTELLURIDE (GAS) 91 BaCI[g] BARIUM MONOCHLORIDE (GAS) 134... 

GeTe GERMANIUM MONOTELLURIDE 778 Hg3(As04)2 TRIMERCURY DIARSENATE 820... 

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