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By Aleksander Abramovich Grinberg
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The salts of calcium can add eight molecules of ammonia per molecule of salt, forming the so-called octammine with the composition [Ca(NH 3 ) 8 ]X 2 . This singularity of the calcium salts includes not only the ammoniates but also the aminates. Thus, it has been shown that the reaction of aqueous solutions of calcium perchlorate with the heterocyclic diamine, o-phenanthroline, (which will be designated as o-Ph) yields a salt with the composition [Ca(o-pH)4](C104)2 • 3 H 2 0. Analogous derivatives were also obtained with stron tium and barium.
Since [Co(NH 3 ) 4 (N0 2 )2]N03 crystallizes in t h e form of brownish-yellow r h o m b o h e d r a l prisms, it was called t h e "flaveo s a l t " (according t o t h e L a t i n designation of this color, flavus). The n a m e "flaveo s a l t " (just as luteo salt or p u r p u r e o salt) is a family n a m e which includes t h e entire group of salts having t h e given complex cation, [Co(NH 3 ) 4 (N0 2 ) 2 ] + . , 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 less stable the bond between the metallic ion and the substituent groups with which it is associated in the initial compound, and the greater the affinity of the ion of the given metal M for the reactant molecule, component A, the easier it is to prepare the required 16 C H E M I S T R Y OF C O M P L E X COMPOUNDS hexammine. In order to make an intelligent choice of the best conditions for synthesizing a given hexammine, we must have, although it be in general terms, a correlation of the tendency of the given metal to undergo complex formation with the various chemical species that may be present.