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    Lec 12 - Overlap and Atom-Pair Bonds

    "Lec 12 - Overlap and Atom-Pair Bonds" Freshman Organic Chemistry (CHEM 125) 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. 00:00 - Chapter 1. The United-Atom "Plum-Pudding" View for Ethane and Methanol 13:24 - Chapter 2. The Orbital Shape of 1-Flouroethanol 19:37 - Chapter 3. Localized Pairwise Bonding Between Atoms and the Idea of Overlap 36:36 - Chapter 4. Hydrogen at Bonding Distance: A Case for Overlap Complete course materials are available at the Open Yale Courses website: http://open.yale.edu/courses This course was recorded in Fall 2008.

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    Channels: Chemistry (General)

    Tags: Overlap LCAO normalization

    Uploaded by: ( Send Message ) on 05-09-2012.

    Duration: 50m 35s

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    Lecture list for this course

    Lec 1 - How Do You Know?

    Lec 2 - Force Laws, Lewis Structures and Resonance

    Lec 3 - Double Minima, Earnshaw's Theorem and Plum-Puddings

    Lec 4 - Coping with Smallness and Scanning Probe Microscopy

    Lec 5 - X-Ray Diffraction

    Lec 6 - Seeing Bonds by Electron Difference Density

    Lec 7 - Quantum Mechanical Kinetic Energy

    Lec 8 - One-Dimensional Wave Functions

    Lec 9 - Chladni Figures and One-Electron Atoms

    Lec 10 - Reality and the Orbital Approximation

    Lec 11 - Orbital Correction and Plum-Pudding Molecules

    Lec 13 - Overlap and Energy-Match

    Lec 14 - Checking Hybridization Theory with XH_3

    Lec 15 - Chemical Reactivity: SOMO, HOMO, and LUMO

    Lec 16 - Recognizing Functional Groups

    Lec 17 - Reaction Analogies and Carbonyl Reactivity

    Lec 18 - Amide, Carboxylic Acid and Alkyl Lithium

    Lec 19 - Oxygen and the Chemical Revolution (Beginning to 1789)

    Lec 20 - Rise of the Atomic Theory (1790-1805)

    Lec 21 - Berzelius to Liebig and Wöhler (1805-1832)

    Lec 22 - Radical and Type Theories (1832-1850)

    Lec 23 - Valence Theory and Constitutional Structure (1858)

    Lec 24 - Determining Chemical Structure by Isomer Counting (1869)

    Lec 25 - Models in 3D Space (1869-1877); Optical Isomers

    Lec 26 - Van't Hoff's Tetrahedral Carbon and Chirality

    Lec 27 - Communicating Molecular Structure in Diagrams and Words

    Lec 28 - Stereochemical Nomenclature; Racemization and Resolution

    Lec 29 - Preparing Single Enantiomers and the Mechanism of Optical Rotation

    Lec 30 - Esomeprazole as an Example of Drug Testing and Usage

    Lec 31 - Preparing Single Enantiomers and Conformational Energy

    Lec 32 - Stereotopicity and Baeyer Strain Theory

    Lec 33 - Conformational Energy and Molecular Mechanics

    Lec 34 - Sharpless Oxidation Catalysts and the Conformation of Cycloalkanes

    Lec 35 - Understanding Molecular Structure and Energy through Standard Bonds

    Lec 36 - Bond Energies, the Boltzmann Factor and Entropy

    Lec Last - Potential Energy Surfaces, Transition State Theory and Reaction Mechanism