of ammonium chloride NH4Cl was completely dissolved in ~10 mL of concentrated ammonia NH3 in a 400 mL beaker. With continuous stirring, 3.3 g of cobalt(II) chloride CoCl2 was added to the mixture gradually. When brown color slurry was obtained, 2.7 mL of 30% hydrogen peroxide H2O2 was added slowly. After the effervescence had stopped, ~10 mL of concentrated Hydrochloric acid HCl was add slowly. With continued stirring, the mixture is heated on a hot plate and maintains 85°C for 20 minutes, and then the mixture is cooled to room temperature in an ice bath and filter (using a Buchner funnel). The crystals of [Co(NH3)5Cl]Cl2 are washed with 5-6 times, 5 mL portions of ice water (distilled water cooled in ice) and then 5-6 times, 5 mL portions of ethanol C2H6O. All chemicals used in preparation of chloro penta amine cobalt(III) chloride were purchased from Sigma-Aldrich