An Introduction to the Chemistry of Complex Compounds by Aleksander Abramovich Grinberg

By Aleksander Abramovich Grinberg

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The acidopentammines m a y C O M P O U N D S OF T H E H E X A , P E N T A , AND T E T R A M M I N E T Y P E 19 also be prepared from t h e previously prepared hexammines b y t h e displacement of ammonia. * The current of ammonia is necessary in order t o prevent t h e displacement of more t h a n one ammonia molecule. Such processes are rarely used and, in all probability, can only be applied successfully in a limited n u m b e r of cases because it is necessary t o t a k e i n t o account t h e m u t u a l effect of t h e co-ordinated groups on each other.

Are often found in t h e literature. A detailed s t u d y of t h e double decomposition reactions of t h e flaveo salts shows t h a t t h e y all contain t h e ion [Co(NH 3 ) 4 (N0 2 ) 2 ] + in which b o t h of t h e N O ^ groups are co-ordinated. The difference in t h e chemical behavior of t h e co-ordinated NO2" group and t h e behavior of free N O ^ ions m a y be illustrated with t h e salt [ C o ( N H 3 ) 4 ( N 0 2 ) 2 ] N 0 2 . I n re crystallizing this salt from a n acetic acid solution t h e external N O ^ g r o u p is destroyed with t h e evolution of t h e oxides of nitrogen, whereas b o t h of t h e co-ordinated N O ^ groups remain completely unaffected.

Long before t h e flaveo salts were prepared, other salts were k n o w n which h a d t h e same composi­ tion b u t which h a d different properties. These salts were obtained in 1875 b y Gibbs and although t h e y h a d t h e very same empirical composition as t h e flaveo salts, t h e y differed from t h e latter in their color, solubility, a n d also in various chemical reactions. Because of their wine-yellow color, t h e y were called croceo salts. Several methods are known for their p r e p a r a t i o n : (1) Oxidation of an aqueous solution of cobalt chloride in t h e presence of N H 3 , NH4ClandNaN02.

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