W2013CHM2311 Part 4b Notes

Mos from p orbital interac0ons energy 2 px 2

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Unformatted text preview: F- Step 1: Draw the orbital energy level diagrams for the valence atomic orbitals, showing the appropriate relaBve energies on the ver0cal energy axis. Either use values that are provided or use electronega0vity as a guide. Be sure to follow the right- hand rule when drawing the orbitals in the Cartesian coordinate system. x z y Deriving Molecular Orbital Diagrams of Heteronuclear Diatomics; OF- 2py 2px 2pz energy - 15.9 eV 2s 2px x 2py 2pz - 18.7 eV - 32.4 eV z y 2s O Atomic Orbitals - 46.4 eV F Atomic Orbitals Deriving Molecular Orbital Diagrams of Heteronuclear Diatomics; OF- Example: OF- Step 2: Determine which orbitals on oxygen can interact with which orbitals on fluorine. For orbitals to interact with each other, they must meet the following condiHons: 1)  Symmetry CondiHons They must have the same symmetry about the internuclear axis ↳  typically chosen as the z- axis. z px pz 2)  Energy CondiHons The difference in their energies must be less than 13 eV. - Symmetry Considera0ons for OF 2py 2px 2pz energy - 15.9 eV 2s - 32.4 eV Symmetry- Allowed InteracHons: O(2s)±F(2s) O(2px)±F(2px) O(2s)±F(2pz) 2px 2py - 18.7 eV O(2py)±F(2py) O(2pz) ±F(2pz) O(2pz)±F(2s) 2s O Atomic Orbitals 2pz - 46.4 eV F Atomic Orbitals - Energy Considera0ons for OF Which of the symmetry- allowed orbital combina0ons are also energy- allowed? (Energy difference < 13 eV) 2py 2px 2pz ΔE = 2.8 eV energy - 15.9 eV 2s 2px 2py 2pz - 18.7 eV - 32.4 eV ΔE = 14 eV 2s O Atomic Orbitals - 46.4 eV F Atomic Orbitals - Energy Considera0ons...
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This note was uploaded on 03/28/2014 for the course CHM 2311 taught by Professor Richardson during the Winter '09 term at University of Ottawa.

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