dihydrogen peroxide in water aq. soln. of H2O2 was added with stirring to mixt. of Co(NO3)2*6H2O and NaHCO3 in water during 1 h; soln. was dild. to 1 l with water and stirred overnight; soln. of Co-NH3 complex in water was added; soln. was stirred and stored in ice bath for 24 h; filtered; washed (H2O); dried by drawing air; elem. anal.;

dihydrogen peroxide in water to ice-cooled soln. of CoCl2 in NaHCO3 H2O2 added dropwise, Co(NH3)6Co(CO3)3 added; ppt. sepd., washed (ice-cold water), dried (dessicator);