Molybdenum tetrabromide

Two other bromides are also obtained from the elements. These are molybdenum tribromide, MoBrs, and molybdenum tetrabromide, MoBr4. MoBrs, a black sobd, is obtained by heating the elements at 350 to 400°C. 

However, when the pentachloride is heated with hydrocarbons, a beta-form of M0CI4 forms. The product always is contaminated with carbon. Heating the pentachloride with molybdenum metal forms the same beta-MoCR. Reaction with hydrogen bromide yields molybdenum tetrabromide. 

Molybdenum Tetrabromide, MoBr4.—During the preparation of the tribromide, a certain quantity not only of oxybromides q.v.) but also of the tetrabromide is formed, the latter forming black fusible needles soluble in water and hydrolysed by alkalies. ... 

S7Br4Mo3, Molybdenum, tetrabromide-hepta-sulfide-tri-, polymeric compound, 33 164 S7Br4 V3, Tungsten, tetrabromide-heptasulfide-tri-, polymeric compound, 33 164 S7Br6Mo3N2Ci6H4o, Molybdate(2-), heptasulfi-dohexabromotri-, bis(tetraethylammo-nium), 33 166... 

Se4HisMo309, Molybdenum(4- -), nonaaquate-traselenidotri-, ion, 33 168 Se4Hig09W3, Tungsten(4+), nonaaquatetrasulfidotri-, ion, 33 169 Se5P2, Diphosphoruspentaselenide, 33 123 Se7Br4Mo3, Molybdenum, tetrabromide-hepta-selenide-tri-, polymeric compound, 33 164 Sc7Br4W3, Tungsten, tetrabromide-heptasele-nide-tri-, polymeric compound, 33 164... 

Under the conditions described above, the formation and extraction of molybdenum (IV) bromide proceed at the rate of ca. 0.086 g. hour-1 or 2.1 g. day-1. For example, 6.85 g. of the tribromide afforded 7.53 g. of tetrabromide after an extraction... 

Tellurium dioxide complexes with thiourea, 305 Tellurium dithiocyanate complexes, 303 Tellurium hexafluoride complexes, 303 with amines, 304 Tellurium sulfate complexes, 303 Tellurium tetrabromide complexes, 302 Tellurium tetrachloride complexes with acetamide, 304 with amines, 304 with pyridine N-oxide, 304 Tellurium tetrafluoride complexes with amines, 304 with dioxane, 304 Tellurotungstates, 1042 Tempera ture-jump studies molybdenum(VI) complexes, 1259 Terbium complexes p diketones, 1081... 

In this process, the organic halide is split into an ion and a radical fragment. Free-radical formation by oxidation of molybdenum carbonyl with carbon tetrachloride and carbon tetrabromide has been studied in detail [6]. The overall reaction may be represented as follows ... 

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