Open Yale CoursesCHEM 125: Freshman Organic ChemistryLecture 12 - Overlap and Atom-Pair Bonds<< previous session| next session >>Overview:This lecture begins by applying the united-atom "plum-pudding" view of molecular orbitals, introduced in theprevious lecture, to more complex molecules. It then introduces the more utilitarian concept of localizedpairwise bonding between atoms. Formulating an atom-pair molecular orbital as the sum of atomic orbitalscreates 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 ofatomic 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 beaccessed from Professor McBride's on-campus course website, which was developed for his Fall 2008
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