Potassium arsenide

Arsine is produced by the reaction of arsenic trichloride, arsenic trioxide or any inorganic arsenic compound with zinc and sulfuric acid. It is also made by treating a solution of sodium arsenide or potassium arsenide in liquid ammonia with ammonium bromide ... 

Higher homologues are coveniently prepared from sodium potassium arsenide and chlorosilanes. The arsenide is a complex mixture formed by mixing a sodium-potassium alloy with powdered arsenic suspended in 1,2-dimethoxyethane (equation l).36... 

To a suspension of sodium potassium arsenide in DME, a solution of 2,3-bis(chlorodimethylsilyl)-1,4-dichlorohexamethyltetrasilane (6) in DME is added. The reaction mixture is refluxed for 12 h. Afrer filtration of the salts the solvent is removed in vacuo, and 2 is reciystallized from n-heptane. 

Ans. ia) K3N, potassium nitride (6) K3P, potassium phosphide (c) KsAs, potassium arsenide. 

Arsenic trichloride Gallium arsenide Potassium arsenate Arsine Arsenic add Sodium arsenate Sodium arsenite CaicKjm arsenate Arsenic trioxide Arsenic pwtoxide Arsenic bisulphide Arsenic pentasulphide Arsenic hemiselenide... 

Parkinson, B.A., Heller, A., and Miller, B., Effects of cations on the performance of the photoanode in the n-gallium arsenide/potassium selenide (K2Se)-potassium diselenide (K2Se2)-potassium hydroxide/carbon semiconductor liquid junction solar cell, /. Electrochem. Soc., 126,954,1979. 

Reactions with phosphorus, arsenic and antimony form phosphide, arsenide, and antimonide of potassium, respectively ... 

Tri-copper Di-arsenide, Cu3As2, is formed when arsine acts on a solution of copper sulphate,17 or on dry copper sulphate or chloride 18 by subjecting a suitable mixture of the powdered elements to a pressure of 6500 atm. 19 by reducing cupric arsenite with fused potassium... 

Iron Monarsenide, FeAs, may be obtained by heating iron in a current of arsenic vapour at 335° to 380° C. 2 by heating a mixture of the elements in a bomb tube at 680° C.,3 or a mixture of iron, arsenious oxide and carbon in an electric arc furnace 4 by the action of fused potassium cyanide on iron arsenate 8 by reduction of the di-arsenide at 680° C. in a current of hydrogen 3 or by dropping a solution of a ferrous salt into an atmosphere of arsine.6... 

Similar brown products may be obtained by the action of water on sodium,6 potassium 7 or calcium 8 arsenide, thus ... 

When arsine is passed over a heated metal, such as the alkali and alkaline earth metals, zinc or tin, the decomposition of the gas is accelerated and the arsenide of the metal is formed. If platinum is used, the removal of arsenic from the gas is complete.3 The action of sodium or potassium on arsine in liquid ammonia yields 4 the dihydrogen arsenide (MHgAs). Heated alkali hydroxides in the solid form quickly decompose the gas, forming arsenites, and at higher temperatures arsenates and arsenides of the metals.5 The aqueous and alcoholic solutions have no appreciable action.6 When the gas is passed over heated calcium oxide the amount of decomposition is not more than that due to the action of heat alone. Heated barium oxide, however, is converted into a dark brown mixture of barium arsenite and arsenate, hydrogen being liberated.7 The gas is absorbed by soda-lime.8... 

Chemical Properties.—Arsenic trisulphide may be reduced to arsenic by heating in a stream of hydrogen the arsenic sublimes. The reaction begins at about 300° C.,10 but proceeds more readily if the sulphide is first fused with an alkali carbonate.11 A similar reduction occurs when the sulphide is heated with a mixture of charcoal and alkali carbonate12 or lime when heated with potassium cyanide,13 an oxalate14 or with a metal such as silver or iron the latter if in excess yields arsenide. 

Cadmium arsenide, nitride, selenide. and telluride are known, the first and third ohlainahle front the elements, while the nitride is obtained by heating the amide lubtained by reaction of cadmium thiocyanate and potassium amide in liquid NHi). and (lie telluride is obtainable by reduction ol the lcllurate with hydrogen. Cadmium arsenide is used as a seiniconducinr. 

The phosphides, arsenides, and antimonides of the other metals are usually dark-coloured substances, with more or less metallic lustre, and therefore conductors of electricity. Some of them occur native for example, smaltine, CoAs2, a common ore of cobalt, forming silver-white crystals copper-nickel, NiAs, red lustrous crystals, and one of the chief nickel ores speiss, a deposit formed in the pots in which smaltine and copper-nickel are fused with potassium carbonate and silica, in the preparation of smalt, a blue glass containing cobalt its formula appears to be Ni8As2. Mispickel, or arsenical pyrites, is a white lustrous substance, of the formula FeSAs. 

Gold arsenides.—Arsenic precipitates from auric-chloride solution an arsenide, AugAs.6 Fusion of thus substance with potassium cyanide converts it into a yellow arsenide, Au4As3, of density 16-2. Both substances have the character of alloys. 

One method for the synthesis of cyclic silicon-phosphorus compounds is the reaction of alkaliphosphides with dichlorosilanes [1]. Using sodium/potassium phosphide, -arsenide, -antimonide and -bismutide Na3E/K3E (E = P, As, Sb and Bi) [2] with various di-, tri-, and tetrachloroorganosilanes, cages of the following types (Fig 1.) have been synthesized so far. 

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