Cobaltic salts bromo bromide

The Sulphato-pentammino-cobaltic Salts, [Co(NH3)s(S04)JR, are isomeric with the acido-pentammino-sulphate series thus, sulphato-pentammino-cobaltic bromide, [Co(NHs)B(S04)]Br, and bromo-pent-ammino-cobaltic sulphate, [Co(NH3)5Br]S04, are isomeric, as also are [Co(NH3)5(S04)]C1 and [Co(NH3)5C1]S04 (see p. 130). 

Further, the frans-series of salts has never been found to give isomers, as they are symmetrica], and therefore such isomerism should not exist. 1-bromo-C-ammino-diethylcnediamino-cobaltic bromide therefore exists in only one form, and the configuration is given by... 

They are isomeric with chloro-nitro-tetrammino-cobaltic chloride, [Co(NH3)4(N02)C1]C1.H20, and bromo - nitro - tetrammino - cobaltic bromide, [Co(NH3)4(N02)Br]Br.H20, the substances originally described by Jorgensen as aquo-salts. These salts are red, whereas all the aquo-nitro-salts are yellow in colour. Both salts are easily transformed into the isomeric nitro-halogeno-compounds on treatment with water.3... 

In 1913 Werner 2 described a new series of optically active cobalt compounds containing two asymmetric cobalt atoms in the molecule, the tetraethylenediamino-/i-amino-nitro-dicobaltic salts. The resolution is effected by treating tetraethylencdiamino - /x - amino - nitro-dicobaltic bromide with silver d-bromo-camphor sulphonate and fractionally crystallising the product. 

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