Gas-chromatographic studies of the thermal decomposition of nitropentaammine-, dinitrotetraamminecobalt(III) complexes in the solid state.
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The gas-chromatographic study of the thermal decompositions of the complexes, [Co(NO<SUB>2</SUB>)(NH<SUB>3</SUB>)<SUB>5</SUB>]Cl<SUB>2</SUB> (I), <I>cis</I>- (II) and <I>trans</I>-[Co(NO<SUB>2</SUB>)<SUB>2</SUB>(NH<SUB>3</SUB>)<SUB>4</SUB>]Cl (III), [Co(NO<SUB>2</SUB>)<SUB>3</SUB>(NH<SUB>3</SUB>)<SUB>3</SUB>] (IV), K[Co(NO<SUB>2</SUB>)<SUB>4</SUB>(NH<SUB>3</SUB>)<SUB>2</SUB>] (V), and K<SUB>2</SUB>[Co(NO<SUB>2</SUB>)<SUB>5</SUB>NH<SUB>3</SUB>] (VI) are reported. The EGA curves for these complexes show that the compounds decompose in two or three stages. In the first stage (<I>ca.</I> 140–240 °C), all complexes evolve nitrogen with the evolution of ammonia and/or nitrogen monoxide. The second stage (<I>ca.</I> 210–300 °C) has been ascribed to the evolution of ammonia from the intermediate dissociation products of compound I, II, and III. The third stage (<I>ca.</I> 275–350 °C) has been ascribed to the evolution of nitrogen monoxide from the solid residue with the exception of IV.
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