Diphosphide

Some phosphides, such as titanium phosphide [12037-65-9] TiP, can be prepared bypassing phosphine over the metal or its haUde. Reaction of phosphine with heavy metal salt solutions often yields phosphines that may contain unsubstituted hydrogens. Phosphides may also be prepared by reducing phosphoms-containing salts with hydrogen, carbon, etc, at high temperatures, the main example of which is the by-product formation of ferrophosphoms in the electric furnace process for elemental phosphoms. Phosphoms-rich phosphides such as vanadium diphosphide [12037-77-3] may be converted to lower phosphides, eg, vanadium phosphide [12066-53-4] by thermal treatment. 

The alkah metal phosphides of formula M P and the alkaline-earth phosphides of formula M2P2 contain the P anion. Calcium diphosphide [81103-86-8] CaP2, contains P reaction with water Hberates diphosphine and maintains the P—P linkage. 

The phosphides tricadrnium diphosphide [12014-28-7], Cd2P2, cadmium diphosphide [12133-44-7], CdP2, and cadmium tetraphosphide [12050-26-9], CdP, may all be prepared by indirect fusion of the elements, usually by passing phosphoms vapors, in a nitrogen or hydrogen carrier gas. 

Baral S, Fojtik A, Weller H, Henglein A (1986) Photochemistry and radiation chemistry of coUoidal semiconductors. 12. Intermediates of the oxidation of extremely small particles of cadmium sulfide, zinc sulfide, and tricadmium diphosphide and size quantization effects (a pulse radiolysis study). J Am Chem Soc 108 375-378... 

E.s.r. showed that, X. ray irradiation of tetraalkyldiphosphine diphosphides gave phosphoranyl radicals with t.b.p. structures (39).114 A structure has been assigned to phosphiny1hydrazy1s (40). The dimethy1 ami no radical was particularly persistent.115 The e.s.r. parameters of the electrogenerated pyrazine radical cations (41) have been recorded.116 The spectra of a stable furanyl phosphate radical adduct117 and a phenalene radical anion which involves injection of spin density into half an attached cyclophosphazene ring,11 are reported. 

The only simple diphosphide complex in Table IV is /-Bu-Ga(PHMes ")2,82 which has Ga—P bond lengths averaging 2.325 A. This distance is, with one exception, longer than those observed in the monophosphide complexes. This is consistent with a weak but significant gallium-phosphorus 7r-interaction where competition between two phospho-... 

Tricopper diphosphide and trimercury tetraphosphide form impact-sensitive mixtures with potassium chlorate. By analogy, the phosphides of aluminium, magnesium, silver and zinc, etc., would be expected to form similar mixtures with metal halogenates. 

Borondiiodophosphide, phosphine, phosphorus trioxide and trimercury tetraphosphide all ignite in contact with chlorine at ambient temperature. Trimagnesium diphosphide and trimanganese diphosphide ignite in warm chlorine [1], while ethylphosphine explodes with chlorine [2], Unheated boron phosphide incandesces in chlorine. 

The powdered phosphide bums vigorously in chlorine. Mixtures with potassium chlorate explode on impact, and with potassium nitrate, on heating. The monophosphide and diphosphide behave similarly. 

Cadmium dichromate, molecular formula, properties, and uses, 6 56 It Cadmium dihydrogen phosphate, 4 514 Cadmium diphosphide, 4 510 Cadmium electrodes, 3 408 standard potential, 3 413t Cadmium electroplating, 24 749 Cadmium ethylenediamine hydroxide, solvent for cotton, 8 21 Cadmium fluoride, 4 512 physical properties of, 4 508t Cadmium fluoroborate, 4 511 Cadmium fluoroborate hexahydrate,... 

Tributyltins, 24 817 as skin irritants, 24 829 Tricadmium diarsenide, 4 510 Tricadmium diphosphide, 4 510 Tricaine methanesulfonate... 

By far the greatest number of tungsten compounds are those in which the element is hexavalent. These include all common halides except the iodide, i.e.. WF. WCl, as well as a number of oxvhalrdes, WOF4, WOCI4, WO Cl , WOBr4, and WO Br2, the Irioxide. trisullide, dibonde, and diphosphide already mentioned, various complexes and organometallic compounds, and the anions. 

The synthesis of black, pyrite type of silicon diphosphide was first accomplished at high pressure1 (15-50 kb.). It has since been prepared by vapor-transport techniques.2 3 A low-pressure, red form of SiP2 is produced by sublimation from 900-500°C. in a... 

These workers also obtained hydrogen hemienneaphosphide, P9H2, by the action of heat on the diphosphide. L. Hackspill also reported the solid hydrogen hemi-pentaphosphide, P5H2) to be formed by heating the hemienneaphosphide in vacuo at 80°, or by the action of dil. acetic acid on the corresponding alkali phosphides. 

According to T. E. Thorpe and A. E. H. Tutton, phosphorous oxide has no action on phosphine either cold or hot. H. Rose, and R. Mahn found phosphorus trichloride reacts with phosphine, forming hydrogen chloride and phosphorus, but A. Besson said that at ordinary temp, hydrogen diphosphide, not phosphorus, is formed. A. Stock said that the reaction does not occur, notably at —20°, while... 

---