The preparation is described of cis‐tetramminebis(dimethylformamide)cobalt(III) and cis‐tetramminebis(trifluoromethanesulfonato)cobalt(III) complexes. The compounds were studied as starting materials for the synthesis of other tetrammine compounds formed by substitution processes which are based on the reactivity of the ligands.
The preparation of trans‐[Co(NH3)4(CH3NH2)Br]2+ and trans‐[Co(NH3)4(CH3NH2)‐(NO3)]2+ complexes is described. The UV‐VIS spectra of the complexes indicate a decrease of the ligand field compared to the parent pentaammines. Infrared spectra match with the pattern of the corresponding pentaammines. The catalyzed (by Hg2+) aquation of the trans‐bromomethylamine complex go under retention of the stereochemical configuration. The base hydrolysis (studied at 25°C) products show trans to cis rearrangement for both complexes. 1H NMR spectroscopy is used for identification of the stereochemical configuration of the compounds.
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