Frequently Asked Question

To calculate the diamagnetic correction for [Co(ox)3]4-, you'll need to follow these steps:
1. Determine the number of electrons in the complex:
- Cobalt (Co) has 27 electrons.
- Each oxalate ligand (ox) has 24 electrons (2 x 12).
- The overall charge of the complex is 4-, meaning it has 4 extra electrons.
- Total electrons: 27 + (3 x 24) + 4 = 103 electrons
2. Use Pascal's constants:
- Look up the Pascal's constants for each atom and ligand in the complex. These values are experimentally determined and represent the diamagnetic contribution of each atom/ligand.
- Add up the Pascal's constants for all atoms and ligands in the complex.
- Multiply this sum by the number of electrons in the complex.
3. Calculate the diamagnetic correction:
- The diamagnetic correction is the negative of the value obtained in step 2.
Example:
Let's assume the Pascal's constants for this complex are:
- Co: -15
- O: -5
- C: -3
The diamagnetic correction would be calculated as:
- Sum of Pascal's constants: (-15) + (3 x 2 x (-5)) + (3 x 2 x (-3)) = -51
- Diamagnetic correction: -(-51 x 103) = 5253 (approximately)
Note:
- This calculation provides an estimate of the diamagnetic correction. The actual value may vary slightly due to the complexity of the electronic structure and the inherent limitations of Pascal's constants.
- Diamagnetic corrections are used in magnetic susceptibility measurements to account for the diamagnetic contribution of the molecule or ion, allowing for the determination of the paramagnetic or ferromagnetic properties.