Phosphorus oxide, sublimation

Phosphorus pentachloride sublimes and then dissociates on heating, dissociation being complete at 600 K. It is attacked by water, yielding first phosphorus trichloride oxide, thus ... 

According to A. Bineau, phosphorus sublimes in ammonia gas without absorption taking place, but C. W. Bockmann, and A. Vogel said that a phosphorus amminoxide can be so prepared. F. A. Fliickiger found that dry phosphorus slowly absorbs ammonia, forming a dark brittle substance and when phosphorus is warmed with aqua ammonia, a black compound of phosphorus oxide and ammonia is produced. A. F. de Foureroy found that when the vapour of phosphorus and ammonia are... 

Phosphorus (V) oxide, sublimation of, in vacuum for preparation of anhydrous deuterophos-phoric acid, 6 81... 

Phosphorus exists as white and red phosphorus. The former allotrope may be preserved in the dark at low temperatures but otherwise reverts to the more stable red form. The white form is a waxy, translucent, crystalline, highly-toxic solid subliming at room temperature and inflaming in air at 35°C, so it is handled under water. The red form is a reddish violet crystalline solid which vaporizes if heated at atmospheric pressure and condenses to give white phosphorus. The red form ignites in air at 260°C. Both are insoluble in water, and white phosphorus can be stored beneath it. Phosphorus forms a host of compounds such as phosphine, tri- and penta-halides, tri-, tetra- and penta-oxides, oxyacids including hypophosphorous, orthophosphorous and orthophosphoric acids. 

In a 1-L three-necked round-bottomed flask and under an atmosphere of nitrogen, a suspension of Os3(CO)12 (0.5 g, 0.55 mmol)4 is prepared in acetonitrile (750 mL), freshly distilled from a slurry of phosphorus pentoxide under nitrogen. To ensure dissolution of the maximum amount of Os3(CO)12, the suspension is heated under reflux for 1 h. The solution is then allowed to cool to room temperature, and under a nitrogen atmosphere, a solution of freshly sublimed, dry trimethylamine oxide (42 mg, 0.55 mmol) in acetonitrile (200 mL) is added to the stirred suspension over a period of 4h using a pressure-equalized dropping funnel. 

Nitrogen pentoxide can be made by dehydration of anhydrous nitric acid with phosphorus pentoxide and sublimation from the mixture at about 40°. Resublimation with ozone and more phosphorus pentoxide gives pure white crystals which rattle around in the reaction chamber after slight evacuation. Direct oxidation with ozone of nitrogen dioxide prepared by heating lead nitrate is a somewhat better way of making the material. 

Zinc Group.—Zinc phosphides have been made chiefly by reactions (1) and (2) (p. 60). Molten zinc unites readily with phosphorus.1 A compound Zn3P2 was prepared by the action of phosphorus vapour on zinc dust 2 the zinc oxide present was reduced and also gave phosphide.3 The phosphide was a grey, well-crystallised substance which did not mix with molten zinc. It was sublimable in hydrogen over 1000° C. and when heated in the air oxidised to zinc phosphate.4 It was not attacked by water, but acids gave phosphine and zinc salts.5 The hydrophosphide, obtained by the action of phosphine on zinc ethide in ether cooled with ice and salt, is much less stable. It is a white powder which is at once decomposed by cold water giving phosphine and zinc hydroxide.6... 

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