Lecture 12 - Overlap and Atom-Pair Bonds

author: J. Michael McBride, Department of Chemistry, Yale University
recorded by: Yale University
published: June 9, 2010,   recorded: October 2008,   views: 2725
released under terms of: Creative Commons Attribution No Derivatives (CC-BY-ND)
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Description

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.

Problem sets/Reading assignment:

Reading assignments, problem sets, PowerPoint presentations, and other resources for this lecture can be accessed from Professor McBride's on-campus course website, which was developed for his Fall 2008 students. Please see Resources section below.

Resources:

Professor McBride's web resources for CHEM 125 (Fall 2008)

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