Abstract: Two coordination compounds, pentaamminechlorocobalt(III) chloride and pentaammineaquacobalt(III) chloride, were synthesized and had percent yields of 68.38% and 45.63% respectively. The pentaamminechlorocobalt(III) chloride was a purple powder. The pentaammineaquacobalt(III) chloride was a reddish-purple powder. Neither coordination compound underwent father purification after synthesis.
Introduction
A coordination compound is a molecule where a central atom, usually a transition metal ion, is surrounded by ligands. The coordination compound can be divided into two parts in terms of Lewis acids and bases. The metal ion is the acid, or the electron pair acceptors, and the ligands are the bases, or the electron pair donors.8
The…show more content… The desired cobalt chloride complex, pentaamminechlorocobalt(III) chloride, was synthesis with the reaction shown in equation 1.
〖CoCl〗_2∙〖6H〗_2 O+〖2NH〗_4 Cl+〖8NH〗_3+H_2 O_2→〖2[〖Co(〖NH〗_3)〗_5 Cl]Cl〗_2+〖14H〗_2 O (1)
A 125-ml Erlenmeyer flask containing 13.2 mL of ammonium hydroxide was combined with hexaaquacobalt (II) chloride (3.52g, 14.8 mmol) and ammonium chloride (1.91g, 52.4 mmol). Solution was stirred by magnetic stir bar while under snorkel, allowing each substance to dissolve before the addition of the next. After both compounds were dissolved, the resulting opaque brown solution had 3.1 mL of 30% hydrogen peroxide added to it, this cause a gas release. The resulting red solution had 11.9 mL of 12M hydrochloric acid added to it, which caused the release of a white vapor. Solution was place in 83.5°C water bath for 23 minutes and 10.2. seconds. The resulting purple solution was suction filtrated with small portions of chilled distilled water; and the aqueous waste, a blue liquid, was discarded. The remaining solid was washed with small portions of chilled acetone and ethanol, and the organic waster was discarded. The resulting pink powder from the washes was placed into a 250-mL Erlenmeyer beaker sealed with a Kem-wipe and rubber band, and dried in the hood for one week. No further purification was done on the synthesized…show more content… The pentaamminechlorocobalt(III) chloride, a purple powder, and the pentaammineaquacobalt(III) chloride, a reddish-purple powder, had percent yields of 68.38% and 45.63% respectively.
Both the reactions had the similarities of the oxidization of the cobalt atom and the hydrogen peroxide being the oxidizing agent. Although while the pentaamminechlorocobalt(III) chloride complex received its ligands from the excess chloride ions from the hydrochloric acid, the pentaammineaquacobalt(III) chloride received them from the distilled water. Consequently since both reactions have numerous side reactions possible and no purification methods were used, there is a chance that either compound produced is not a desired
