CHEM 4701 Lecture Notes - Lecture 16: Scandium, Libyan Dinar, Phenylalanine
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Ligand field theory for coordination complexes of transition metals. You have 3 different types of ligands: sigma donors, pi donors, pi acceptors. -> have 3 different types of interactions btwn a ligand and metal: ligand-to-metal sigma direction. Electrons come from ligand to metalgoing to orbital that"s sigma in character. Metals aren"t that electronegative, so might want to give electrons back to the ligand. Interaction btwn filled pi valenceorbital on metal and empty pi orbital on ligand (lumo) that has correct symmetry. Removes excess electron density from the metal --> often called pi-backdonation ligand always donates electrons through sigma bondmay or may not have pi donation like a lewis base. Lumo = pi* --> empty and pi in character --> pi acceting (allows pi backdonation. -> co = pi acceptor sigma-donors: . h, . ch3, alkyls, amines (nh3, nme3) pi-donors: filled sigma bond + filled pi orbital.
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