Nickel hexammine chloride

FiG. 23-1. The structure of crystalline nickel hexammine chloride, Ni(NH3)gCl2. The crystal contains octahedral nickel hexammine ions and chloride ions. 

Nickel Chloride - 428 220 s nickel carbonyl, nickel hexammine chloride, ammonium carbonate, ammonia. H-. CO. CO . CO-CO pressure 2500 psig — specimens metallic-arc welded and stres 243 hrs. 

The compounds of copper and mercury attained importance in practical agriculture, while the salts of other metals were mostly the subjects of scientific research. Thus, for example, Farkas and Kiraly (1960) found nickel(II)hexammine chloride to be effective against the black smut and red smut of wheat. The compound also kills the rust colonies when applied after infection, thus having a curative effect as well as increasing the yield. 

Hexammino-nickel Chloride, [Ni(NH3)6]Cl2.—Nickel chloride absorbs ammonia gas at ordinary temperature. Rise in temperature occurs and increase in volume. The hexammine is best prepared, however, from an aqueous solution of the salt, as when prepared from the dry salt and ammonia gas it is exceedingly bulky. Aqueous ammonia is added to a solution of pure nickel chloride until the nickel hydroxide first precipitated is almost dissolved. The liquid is filtered and a saturated aqueous solution of ammonium chloride containing ammonia added, and air drawn through the liquid. On the addition of a further quantity of ammonium chloride a precipitate forms, which is collected, washed with ammonium chloride and ammonia, and finally with alcohol containing ammonia. 

Triammino-nickel Chloride, [Ni(NH8) 8] Cl s.2H20, is obtained in large octahedral crystals on dissolving the hexammine in water and slightly wanning the solution.3... 

Monammino-nickel Chloride, [Ni(NH3)]Cl2, is also known, and is produced by the thermal decomposition of the hexammine. It is yellow in colour and decomposes completely at 378° C.4... 

Of the otherwise so stable hexammine nickel complexes [Ni(NH3)6]X2 the fluoride decomposes again immediately when one attempts to prepare it from the chloride by double decomposition with AgF. 

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