Crystal Field Theory for Octahedral Complex | Summary and Q&A

TL;DR

This video explains the crystal field theory for octahedral complexes, discussing the splitting of D orbitals and the energy levels of different orbitals.

Key Insights

• 🏑 Crystal field theory explains the splitting of D orbitals in octahedral complexes.
• 🥺 Ligands approaching D orbitals lead to repulsion, causing the splitting of orbitals into T2g and EG levels.
• 😘 Electron filling in octahedral complexes depends on ligand strength, resulting in low spin or high spin complexes.

Transcript

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Questions & Answers

Q: How do ligands affect the splitting of D orbitals in octahedral complexes?

Ligands approaching D orbitals cause the splitting of the orbitals into T2g and EG orbitals, with T2g orbitals having maximum electron density along the axis and experiencing more repulsion compared to EG orbitals.

Q: What is the energy level diagram for the splitting of D orbitals in octahedral complexes?

The energy level diagram shows T2g orbitals at lower energy and EG orbitals at higher energy. The energy difference between the two levels is represented by delta (Δ).

Q: How is electron filling determined in octahedral complexes?

The filling of electrons depends on the ligands and their strength. If ligands are strong, electrons fill the lower energy level, forming a low spin complex. If ligands are weak, electrons can be easily excited to the higher energy level, forming a high spin complex.

Q: What is the difference between octahedral complexes and tetrahedral complexes in terms of orbital energy levels?

In octahedral complexes, T2g orbitals are at the lower energy level, while in tetrahedral complexes, D orbitals at the upper energy level.

Summary & Key Takeaways

• The video discusses the crystal field theory for octahedral complexes, where the metal is at the center and 6 ligands are arranged on the vertices of an octahedron.

• DZ Square and DX Square Y Square orbitals have maximum electron density along the axis and experience repulsion from ligands, while XY DYZ and DZX orbitals have maximum electron density on the plane and experience less repulsion.

• This difference in repulsion leads to the splitting of D orbitals into different energy levels, with T2g orbitals at lower energy and EG orbitals at higher energy.