Nitride bromides

All the crystal structures of the nitride chlorides have as a common feature that they contain N -centered tetrahedra, the electroneutrality of the compound being assured by the chlorine ligands. This dominating structural feature, underlined recently by Schleid (1996), is common to (oxy)nitride bromides and iodides and also to nitride sulfides and nitride sulfide chlorides. 

Finally, CsPrgNbBrsNe (Lulei and Corbett 1997) is a recently reported quinary nitride bromide in which a partial substitution of niobium for praseodymium has been achieved, resulting in mixed Pr3Nb(N) tetrahedra. 

Mono-, di-, and trivalent bromides and iodides may be made by methods similar to the chlorides. The lower valence salts also disproportionate in water. Indium trifluoride [7783-52-0] InF., is sparingly soluble in water. It forms an ammonium double salt, SNH F TnF. [15273-84-4] which decomposes on heating to indium nitride [25617-98-5] InN. 

Bromine Nitride (Nitrogen bromide or Nitrogen tribromide). NBr3 (probably), mw 253.74,... 

Mercury Nitride. Hg3N2, mw 629,78, N 4.45%, brown powd, mp (explds). Sol in amm hydroxide, dil acids, coned nitric acid and amm salts. Prepd by adding a soln of mercuric iodide or bromide to an excess of a soln of K amide in liq ammonia (Refs 1-3)... 

Interaction gives a mixture of tritellurium tetranitride and tellurium bromide nitride, which explodes on heating. 

Prandtl mixing length hypothesis, 11 779 Prandtl number, JJ 746, 809 13 246-247 Praseodymium (Pr), J4 631t, 634t electronic configuration, J 474t Praseodymium bromide, physical properties of, 4 329 Prater equation, 25 270, 299 Prater number, 25 299, 300-301, 303 effect on maximum dimensionless intrapellet temperature, 25 304, 309 effect on maximum intrapellet temperature, 25 306 Prato reaction, 12 244 Pratsinis aluminum nitride, 17 212 Pravachol, 5 143... 

The chlorides, bromides, iodides, and cyanides are generally vigorously attacked by fluorine in the cold sulphides, nitrides, and phosphides are attacked in the cold or may be when warmed a little the oxides of the alkalies and alkaline earths are vigorously attacked with incandescence the other oxides usually require to be warmed. The sulphates usually require warming the nitrates generally resist attack even when warmed. The phosphates are more easily attacked than the sulphates. The carbonates of sodium, lithium, calcium, and lead are decomposed at ordinary temp, with incandescence, but potassium carbonate is not decomposed even at a dull red heat. Fluorine does not act on sodium bofate. Most of these reactions have been qualitatively studied by H. Moissan,15 and described in his monograph, Lefluor et ses composes (Paris, 1900). 

The same apparatus can be used (when individual components, absorbents, or drying means are replaced) for synthesis of the most diverse compounds. Figure 61 (p. 105) shows an apparatus that can be used to produce chlorides, bromides, nitrides, sulphides, and hydrides of many metals. When the products are volatile, a special trap is installed at the end of the apparatus. When compounds that are unstable in moisture are being synthesized, a wash bottle or a column with a desiccant must be installed at the outlet from the apparatus. 

After investigating the action of liquid ammonia on a variety of selenium compounds, Streeker and Claus 5 have come to the conclusion that the tetrahalides are the best initial materials for the preparation of selenium nitride. The action of liquid ammonia on selenium tetra-bromide in the presence of carbon disulphide gives a good yield of the nitride. 

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