Before exploring the bonding in the Cr-CO complex, review the molecular orbitals for carbon monoxide.
The Ligand Field Theory energy diagram for complexation of a single carbon monoxide ligand by chromium(0) is shown below. Clicking on an orbital in the energy diagram displays the 90% isosurface for that orbital in the virtual reality display. For the sake of simplicity, interactions involving the chromium 4s and 4p orbitals are omitted.
For each molecular orbital
- Identify the metal and ligand orbitals that mix to form the molecular orbital.
- Identify whether the molecular orbital is σ, σ*, π, π*, or n in character.
- Identify whether the molecular orbital has primarily metal or ligand character.
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Ligand Field Theory for Cr(F)2+