"Lec 13 - Overlap and Energy-Match" Freshman Organic Chemistry (CHEM 125) Professor McBride uses this lecture to show that covalent bonding depends primarily on two factors: orbital overlap and energy-match. First he discusses how overlap depends on hybridization; then how bond strength depends on the number of shared electrons. In this way quantum mechanics shows that Coulomb's law answers Newton's query about what "makes the Particles of Bodies stick together by very strong Attractions." Energy mismatch between the constituent orbitals is shown to weaken the influence of their overlap. The predictions of this theory are confirmed experimentally by measuring the bond strengths of H-H and H-F during heterolysis and homolysis. 00:00 - Chapter 1. Distance and Hybridization in the Overlap Integral 18:49 - Chapter 2. Influence of Overlap on Molecular Orbital Energy 29:45 - Chapter 3. "Inferior" Orbitals and Energy-Matching 46:59 - Chapter 4. Experimental Evidence and Conclusion 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 integral sigma bond pi bond energy mismatch
Uploaded by: yalefreshorganic ( Send Message ) on 05-09-2012.
Duration: 49m 44s
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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 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 12 - Overlap and Atom-Pair Bonds
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