W2013CHM2311 Part 4a Notes

Add pu su subtract pg sg subtract add sp mixing

Info iconThis preview shows page 1. Sign up to view the full content.

View Full Document Right Arrow Icon
This is the end of the preview. Sign up to access the rest of the document.

Unformatted text preview: . Overlap regions of opposite sign give rise to antibonding interactions. Orthogonal orbitals or atomic orbitals with different rotational symmetry about the internuclear axis CANNOT interact. 2. Relative energies of the AOs must be similar Energy Energy The overlap and relative stability of the MO depends on the energy difference between the initial AOs. The effect is inversely proportional to the difference between the overlapping AOs. ΔE ΔE Summary of Requirements for Bonding to Occur 1. Symmetry of the AO The symmetry of the atomic orbitals must be such that regions of the same sign can overlap for a bonding interaction. Overlap regions of opposite sign give rise to antibonding interactions. Orthogonal orbitals or atomic orbitals with different rotational symmetry about the internuclear axis CANNOT interact. 2. Relative energies of the AOs must be similar The overlap and relative stability of the MO depends on the energy difference between the initial AOs. The effect is inversely proportional to the difference between the overlapping AOs. 3. Extent of overlap between the atomic orbitals The distance between atoms must be short enough to provide strong overlap of orbitals. The greater the overlap the more the bonding MO is lowered and the higher the antibonding MO is raised. Prac0ce Problem Draw MO diagrams for H2 ­, He2+, and He22+. In...
View Full Document

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.

Ask a homework question - tutors are online