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By Aleksander Abramovich Grinberg

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Extra resources for An Introduction to the Chemistry of Complex Compounds

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The equation for t h e reaction i s : [CoEn 2 Cl 2 ]Cl + N H 3 -> [CoEn 2 NH 3 Cl]Cl 2 The following salts are examples of t h e k n o w n compounds of t h e acidopentammine t y p e : (a) salts of cobalt (III) [Co(NH 3 ) 5 Cl]X 2 ; [Co(NH 3 ) 5 SCN]X 2 ; [Co(NH 3 ) 5 N0 2 ]X 2 ; [Co(NH 3 ) 5 OH]X 2 ; [Co(NH 3 ) 5 C0 3 ]X; [Co(NH 3 ) 5 S0 4 ]X; [Co(NH 3 ) 4 (H 2 0)Cl]X 2 ; [Co(NH3)5P04]; [Co(NH 3 ) 5 P 2 0 7 ]Na; [Co(NH 3 ) 5 C 6 H(COO) 5 ]Na 2 ; [Co(NH 3 ) 5 C 6 (COO) 6 ]Na 3 ; [CoEnNH 3 (H 2 0) 2 Cl]X 2 ; [CoEn 2 NH 3 Cl]X 2 ; * Z.

For example, it is obvious t h a t , whereas a m m o n i a , ethylamine, methylamine, and other molecules of t h e same t y p e , can, a n d do, form acidopentammines, mole­ cules such as ethylenediamine, which occupy t w o co-ordination places, can not form acidopentammines under these conditions. e. compounds which contain different n e u t r a l molecules, A, in t h e complex ion, are usually obtained b y s t a r t i n g from t h e com­ plexes of t h e diacidotetrammine series or of other series which have already been prepared.

The ethylenediamine salts of the praseo series were prepared in 1889 and the salts of the violeo series in 1890. The salts of the praseo series can be prepared easily by oxidizing solutions of CoCl2 with atmospheric oxygen in the presence of ethylenediamine. They separate from concentrated solutions upon the addition of hydrochloric acid. In this manner, an acid salt having the composition [CoEn2Cl2]Cl • HC1 • 2 H 2 0 is obtained. If this salt is treated with alcohol or if it is simply dried at 100°, it loses HC1 and the water, and is converted into an emerald green salt, [CoEn2Cl2]Cl.

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