Abstract
NH4[Co(NH3)2(NO2)4] belongs to the space group P212121, with four formula units per unit cell. All the atomic coordinates were determined by the method of two-dimensional Fourier series. The structure is found to be isotype to K[Co(NH3)2(NO2)4]. Two ammonia groups are co-ordinated to the central cobalt atom in the trans-positions. General features of the structures of various nitro-ammine-cobalt(III) complexes were discussed. The absorption spectra of these complexes were reexamin-ed in their aqueous solutions. Results are briefly discussed in relation to their steric configurations.

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