Molybdenum tetrachloride

When heated with carbon tetrachloride at elevated temperatures, the dioxide converts to molybdenum tetrachloride, M0CI4 ... 

Reaction with tetrachloroethylene forms molybdenum tetrachloride (an alpha-isomer of M0CI4 that is isomorphous with NbCR.)... 

Molybdenum Tetrachloride, M0CI4, may be prepared by the action of chlorine at a high temperature upon molybdenum, or upon the oxide or sulphide mixed with carbon by heating the trichloride to redness in a stream of dry carbon dioxide, both the tetrachloride and the dichioride of molybdenum are obtained, although the former does not distil without decomposition. 

Molybdenum tetrachloride forms a semi-crystalline deliquescent powder, unstable in air, in which, if heated, it aelds the oxychloride MoOaCl and dichlormolybdic acid M0O3.2HCI it is also stated to be converted spontaneously into the pentachloride and trichloride. If sufficiently heated—though below 1380° C.—it is reduced to the metal. In water, alcohol, ether, and in dilute sulphuric acid it gives unstable solutions. 

The blue oxide is best obtained by allowing powdered molybdenum to remain for a long time at ordinary temperatures in contact with an aqueous suspension of the trioxide, filtering, and then digesting with a further quantity of molybdenum. The solution is evaporated in vacuo. Cold water used for washing the solid should previously be rendered air-free. Another good method of preparation consists in precipitating in the cold, by means of excess of a solution of hydrated molybdenum tetrachloride, a solution of ammonium molybdate in hydrochloric acid the precipitate is w ashed with air-free w ater in an atmosphere of carbon dioxide, and is dried m vacuo. 

Cl4lr2C joHjo, Iridium(III), di-p-chloro-dichlorobis(ii -pentamethylcyclo-pentadienyl)di-, 29 230 Cl4MoN2C4Hg, Molybdenum, bis(aceto-nitrile)tetrachloFO-, 28 34 CI4M0O, Molybdenum tetrachloride oxide, 28 325... 

MoOC oH,5, Molybdenum(IV), oxobis(Ti -cyclopentadienyl)-, 29 209 M0OC12H14, Molybdenum(IV), oxobis(T] -methylcyclopentadienyl)-, 29 210 M0OCI4, Molybdenum tetrachloride oxide, 28 325... 

CX lPjRhCjjHjo, Rhodium, carbonylchloro-bis(tiiphenylphosphine)-, trans-, 28 79 OClP]RhS2C42H] Rhodium, chloro[[2-[(diphenylphosphino)methyl]-2-methyl-l,3-propanediyl]bis(diphenyl-phosphine)](dithiocarbonatoK 27 289 OCI4M0, Molybdenum tetrachloride oxide, 28 325... 

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