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Magnetic Susceptibility Synthesis of Mn(acac) 3

Magnetic Susceptibility Synthesis of Mn(acac) 3. Synthesis 12. Reasons for Determining Number of Unpaired Electrons. Related to the oxidation state of the metal. Helpful in assigning geometry. Information provided about metal-metal bonding.

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Magnetic Susceptibility Synthesis of Mn(acac) 3

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  1. Magnetic Susceptibility Synthesis of Mn(acac)3 Synthesis 12

  2. Reasons for Determining Number of Unpaired Electrons • Related to the oxidation state of the metal. • Helpful in assigning geometry. • Information provided about metal-metal bonding. • Information provided about the bonding between the metal and its ligands.

  3. Octahedral Metal Complexes • Crystal field theory predicts that the five d orbitals split. • 3 orbitals of low energy, t2g • 2 orbitals of high energy, eg • The energy ‘gap’ between the two sets of orbitals depends on the ligands. • I-<Br-<Cl-<F-<OH-<H2O<NH3<NO2-<PPh3<CH3-<CN-<CO (the spectrochemical series)

  4. Octahedral Metal Complexes • For octahedral complexes that possess between 4 and 7 d electrons, there are two different ways to distribute the electrons. • Depends on the energy ‘gap’. • Illustrate for Fe(H2O)63+ (five electrons). • High-spin versus low-spin. • If the energy gap is large enough, all the electrons will be placed in the t2g (low-spin). • If the energy gap is small, five electrons will be paired in each orbital first (low-spin and high-spin).

  5. Obtaining the Mass Susceptibility • Packing the sample tube • Page 7 in the instruction manual • Operating the balance • Pages 8 and 9 in the instruction manual. • Calibration of the instrument, CBal • Use the MKI standard to do this (Sherwood Scientific printout). • Obtain the magnetic susceptibility (mass) of your sample(s)

  6. Magnetic Susceptibility Mass susceptibility l = sample length (cm) m = sample mass (g) R = reading for tube place sample Ro = empty tube reading CBal = balance calibration constant Molar susceptibility

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