Chemistry 125A: Freshman Organic Chemistry I - Lecture 12: Overlap and Atom-Pair Bonds - Professor J. Michael McBride
Lecture 12 : Overlap and Atom-Pair Bonds
This lecture begins by applying the united-atom "plum-pudding" view of
molecular orbitals, introduced in the previous lecture, to more complex
molecules. It then introduces the more utilitarian concept of localized
pairwise bonding between atoms. Formulating an atom-pair molecular
orbital as the sum of atomic orbitals creates an electron difference
density through the cross product that enters upon squaring a sum. This
"overlap" term is the key to bonding. The hydrogen molecule is used to
illustrate how close a simple sum of atomic orbitals comes to matching
reality, especially when the atomic orbitals are allowed to hybridize.
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