Molybdenum dibromide

When bromine vapor is passed over molybdenum metal at 600 to 700°C in an atmosphere of nitrogen, the product is trimeric molybdenum dibromide (trimolybdenum hexabromide) (Mo3Bre) ... [Pg.583]

Molybdenum Dibromide, MoBtj, is obtained by heating the tribromide, or by strongly heating the metal in bromine vapour. It is a reddish-yellow substance, stable in air, insoluble in water and in acids in dilute alkalies it is soluble with formation of a hydrate, but by concentrated alkalies it is decomposed. For reasons similar to those applying in the case of the chloride (see p. 123), the formula of the bromide is considered to be (MojBr4)Br2. ... [Pg.127]

Among the divalent compounds of molybdenum are the dihromidc. MoBr-, and the dichloride. MoCI . There is also a complex ion of divalent molybdenum MosClJ. (flat is of particular interest because it does not yield Mo21 ions. The chloride sail of the ion. Mo CLi- has been shown, by precipitation with Ag+, to have two-thirds of its chlorine content present in a complex, so ils structure is established as [Mt CIsJCU, It is obtained by higher temperature disntutation of MoClj, while the corresponding dibromide ean be produced by direct reaction of the elements,... [Pg.1039]

Molybdenum Tribromide, MoBrj, is formed w hen bromine-vapour is passed over moderately heated molybdenum or over a mixture of the dioxide with carbon. The compound sublimes, recondensing to dark green erj stals, which tend on heating to decompose into bromine and the dibromide, and which are insoluble in water, dilute acids, or alkalies they dissolve, however, in concentrated alkalies, the bromide undergoing hydrolysis. ... [Pg.127]

Molybdous Oxide.—The black precipitate obtained by addition of caustic soda to a solution of molybdenum diehloride or dibromide, originally thought to be hydrated molybdous oxide, has been show actually to be the sesquioxide. [Pg.129]

MnBr2 MANGANESE DIBROMIDE 1037 Mo2S3 MOLYBDENUM SESQUISULFIDE 1076... [Pg.1912]

MnBr2[g] MANGANESE DIBROMIDE (GAS) 1038 MoSI2 MOLYBDENUM 2-SILICON 1077... [Pg.1912]

MoC MOLYBDENUM MONOCARBIDE (GAMMA) 1066 Na2Br2[g] DISODIUM DIBROMIDE (GAS) 1113... [Pg.1912]

Despite its spectacular present, it should be remembered that metal atom cluster chemistry also has a very early origin. The earliest point to which I have been able to trace it is the period 1857 1861 when a Swedish chemist, Christian Bloomstrand, discovered the dichloride and dibromide of molybdenum. Based on the significant observation that these contained two kinds of halogen, one precipitable by silver ion and the other not, in a 1 2 ratio, he concluded that the minimum acceptable molecular formula for these compounds was M03X6, and that this consisted of a... [Pg.5]

Imido complexes also react with organic electrophiles. For example, the molybdenum-imido complex in Equation 13.87 reacts with methyl bromide to generate the metal dibromide and trialkylaiulinium bromide. Simple alkylations of an 0x0 group to generate an aUcoxide product are uncommon, but one example of alkylation of a zironocene-oxo complex is shown in Equation 13.88. One example of a related silylation to generate a siloxide complex is shown in Equation 13.89. [Pg.523]

Big Chemical Encyclopedia

Chemical substances, components, reactions, process design ...