Magnetic Susceptibility of Two Iron(Iii) Compouns
School of chemistry and physics @ PMB
Department of chemistry
Inorganic Chemistry (CHEM310)
August 23, 2013
Mncedisi Mazibuko
211506686
Experiment 4
Magnetic Measurements: The Magnetic Susceptibility of Two Iron (III) Compounds
Abstract
The first compound, tris(acetylacetonano)lron(lll) (Fe(acac)3), was synthesized at a yield of 71% and the actual mass of 1.27g and the second compound, potassium hexacyanoferrate(lll) (K3[Fe(CN)6]), was already synthesized in Mudie Laboratory. The magnetic moment of K3[Fe(CN)6] was found to be 1.07 MB and that of Fe(acac)3 was found to be 1.43 MB. The ligand CN- was said to be a strong field ligand and its complex was said to be of a low spin. The ligand acac was said to be a weak field ligand and its complex was said to be of a high spin. [K3(acac)3]) had 5 unpaired electrons whereas k3[Fe(CN)6] had 1 unpaired electron.
Aim
The experiment aim was to determine the magnetic susceptibility of two iron(III) compounds, tris(acetylacetonano)lron(lll) (Fe(acac)3) and potassium hexacyanoferrate(lll) (K3[Fe(CN)6])
Results and Discussion
The compound, tris(acetylacetonano)lron(lll) (Fe(acac)3), was synthesized by reacting hydrated ferric chloride + acetyl acetone in ethanol and sodium acetate in water. The formed crystals were then recrystallized by dissolving in ethanol and washing with water. This synthesized compound and hexacyanoferrate(lll) (K3[Fe(CN)6]), which was already synthesized, were individually taken to the Sherwood Magnetic Susceptibility Balance (M.S.B) for measurements of calculating their individual magnetic susceptibilities and hence the magnetic moments.
FeCl3.6H20 + C5H802 + NaCH3C00 → Fe(acac)3
Mr (FeCl3.6H20) = 270.30 g mol-1
Mr (C5H802) = 152.06 g mol-1
Mr (NaCH3C00) = 82.01 g mol-1
Mr [Fe(acac)3] = 353.02 g mol-1
n (FeCl3.6H20) = 1.3719g / 270.30 g mol-1 = 5.08 x 10-3 mol n (C5H802) = 2.0g / 152.06 g mol-1 = 1.32 x 10-2 mol n (NaCH3COO) = 3.0g / 82.01 g
Department of chemistry
Inorganic Chemistry (CHEM310)
August 23, 2013
Mncedisi Mazibuko
211506686
Experiment 4
Magnetic Measurements: The Magnetic Susceptibility of Two Iron (III) Compounds
Abstract
The first compound, tris(acetylacetonano)lron(lll) (Fe(acac)3), was synthesized at a yield of 71% and the actual mass of 1.27g and the second compound, potassium hexacyanoferrate(lll) (K3[Fe(CN)6]), was already synthesized in Mudie Laboratory. The magnetic moment of K3[Fe(CN)6] was found to be 1.07 MB and that of Fe(acac)3 was found to be 1.43 MB. The ligand CN- was said to be a strong field ligand and its complex was said to be of a low spin. The ligand acac was said to be a weak field ligand and its complex was said to be of a high spin. [K3(acac)3]) had 5 unpaired electrons whereas k3[Fe(CN)6] had 1 unpaired electron.
Aim
The experiment aim was to determine the magnetic susceptibility of two iron(III) compounds, tris(acetylacetonano)lron(lll) (Fe(acac)3) and potassium hexacyanoferrate(lll) (K3[Fe(CN)6])
Results and Discussion
The compound, tris(acetylacetonano)lron(lll) (Fe(acac)3), was synthesized by reacting hydrated ferric chloride + acetyl acetone in ethanol and sodium acetate in water. The formed crystals were then recrystallized by dissolving in ethanol and washing with water. This synthesized compound and hexacyanoferrate(lll) (K3[Fe(CN)6]), which was already synthesized, were individually taken to the Sherwood Magnetic Susceptibility Balance (M.S.B) for measurements of calculating their individual magnetic susceptibilities and hence the magnetic moments.
FeCl3.6H20 + C5H802 + NaCH3C00 → Fe(acac)3
Mr (FeCl3.6H20) = 270.30 g mol-1
Mr (C5H802) = 152.06 g mol-1
Mr (NaCH3C00) = 82.01 g mol-1
Mr [Fe(acac)3] = 353.02 g mol-1
n (FeCl3.6H20) = 1.3719g / 270.30 g mol-1 = 5.08 x 10-3 mol n (C5H802) = 2.0g / 152.06 g mol-1 = 1.32 x 10-2 mol n (NaCH3COO) = 3.0g / 82.01 g