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38 molecular orbital diagram of benzene

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I’ve been tasked with drawing rhe MO diagram for Sulfure Oxide and I’m not sure about the energies of the relatove orbitals. Since Oxygen is more electronegative I expect the 2s and 2p orbitals to have much lower energy than the 3s and 3p orbitals sulfur has. But the energy difference would be really high then. So I’m not sure what 2 orbitals combine to form the sigma 3s or sigma* 3s orbital. The difference in energy kevels confuses me as every example I’ve done has the same orbitals (2s,2p’s) c... What happens to the molecular orbital diagram when a metal-ligand complex is oxidized? Oxidation removes an electron, e.g. you go from d8 metal to d7 metal. As consequence the antibonding orbital has an unpaired electron making the complex less stable (weaker M-L bond, since less pi-backdonation), but how does it change the gap between the metal MO and LUMO of ligand, as well as the gap between the metal MO and HOMO of the ligand? The orbital structure of benzene: All the carbon at...