Understanding High Spin Complexes
High spin complexes typically occur when there is a weak field ligand present, which does not cause significant splitting of the d-orbitals. This results in the electrons occupying the higher energy levels rather than pairing up in the lower energy levels.
Analysis of Given Complexes
The complexes provided are:
1. Fe(H2O)6SO4
2. Fe(CO3)
3. K2(Ni(CN)4)
4. Fe(CN)4
Identifying High Spin Complex
- Fe(H2O)6SO4:
- Water is a weak field ligand.
- This complex is likely to be high spin due to minimal splitting of d-orbitals.
- Fe(CO3):
- Carbonate is also a weak field ligand.
- However, depending on the oxidation state of Fe, it may behave differently. Generally, expected to be high spin.
- K2(Ni(CN)4):
- Cyanide is a strong field ligand.
- This complex would be low spin due to significant d-orbital splitting.
- Fe(CN)4:
- Like cyanide, this ligand is also strong.
- This complex will also be low spin.
Conclusion
From the analysis, Fe(H2O)6SO4 is the most likely high spin complex among the options provided, as water does not cause significant splitting, allowing for unpaired electrons in the d-orbitals.